{"product_id":"retrol-x-okmo-b04-air-cooled-hit-and-miss-engine-model-kit-farm-engine","title":"Retrol x OKMO B04 3.6cc Air-Cooled Hit and Miss Engine Model Kit – Horizontal 4-Stroke Gasoline Mini Farm Engine","description":"\u003c!-- OKMO B04 product description | Stirlingkit | vintage farm-engine catalog style --\u003e\n\u003cstyle\u003e\n.skb04{--g:#2e5a3c;--gd:#1f3f2a;--brass:#b8893b;--brass-l:#d9b46a;--paper:#f5eedc;--paper-d:#ebe0c4;--ink:#2a2118;--wood:#7a3f22;--org:#EA5504;\nfont-family:Georgia,\"Times New Roman\",serif!important;color:var(--ink)!important;background:var(--paper)!important;line-height:1.7!important;max-width:none!important;width:100%!important;margin:0!important;padding:0 0 24px!important;box-sizing:border-box;border-radius:6px;overflow:hidden}\n.skb04 *{box-sizing:border-box;font-variant-numeric:lining-nums}\n.skb04 p{margin:0 0 14px!important;font-size:16.5px!important;color:var(--ink)!important}\n.skb04-in{padding:0 18px!important}\n.skb04 h2{font-family:Georgia,serif!important;font-size:25px!important;font-weight:700!important;text-align:center!important;color:var(--gd)!important;margin:44px 0 6px!important;line-height:1.25!important;letter-spacing:.01em}\n.skb04-orn{text-align:center!important;color:var(--brass)!important;font-size:14px!important;letter-spacing:.5em!important;margin:0 0 18px!important}\n.skb04-kick{display:block;text-align:center;font-family:Arial,Helvetica,sans-serif!important;font-size:11.5px!important;letter-spacing:.22em!important;text-transform:uppercase;color:var(--wood)!important;margin:40px 0 0!important;font-weight:700}\n.skb04-kick+h2{margin-top:6px!important}\n\n\/* coming soon banner *\/\n.skb04-soon{background:var(--wood)!important;padding:12px!important}\n.skb04-soon-in{border:2px solid var(--brass);outline:1px solid var(--brass-l);outline-offset:-6px;border-radius:10px;padding:18px 14px!important;text-align:center;background:linear-gradient(180deg,#8a4a2a,#6b361c)}\n.skb04-soon .k{font-family:Arial,Helvetica,sans-serif!important;color:var(--brass-l)!important;font-size:12px!important;letter-spacing:.32em!important;text-transform:uppercase;font-weight:700!important;margin:0 0 6px!important}\n.skb04-soon .t{color:#f6ecd0!important;font-size:21px!important;font-weight:700!important;margin:0 0 6px!important;line-height:1.3!important}\n.skb04-soon .d{color:#ecdcc0!important;font-size:15px!important;margin:0 0 14px!important}\n.skb04-soon-btn{display:inline-block;background:var(--org)!important;color:#fff!important;font-family:Arial,Helvetica,sans-serif!important;font-weight:700!important;font-size:14px!important;letter-spacing:.14em;text-transform:uppercase;text-decoration:none!important;padding:12px 28px!important;border-radius:4px;border:1px solid var(--brass-l);box-shadow:0 2px 0 #4a2412}\n.skb04-soon-btn:hover{background:#c94700!important}\n\n\/* nameplate hero *\/\n.skb04-hero{background:var(--g)!important;padding:22px 14px 26px!important;position:relative}\n.skb04-plate{border:3px solid var(--brass);outline:1px solid var(--brass-l);outline-offset:-9px;border-radius:14px;padding:30px 16px 24px!important;text-align:center;position:relative;background:linear-gradient(180deg,#336645,#25503a)}\n.skb04-plate:before,.skb04-plate:after{content:\"\";position:absolute;top:12px;width:9px;height:9px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#f3d999,#8a6420)}\n.skb04-plate:before{left:12px}.skb04-plate:after{right:12px}\n.skb04-plate .tl{font-family:Arial,Helvetica,sans-serif!important;color:var(--brass-l)!important;font-size:11.5px!important;letter-spacing:.3em!important;text-transform:uppercase;margin:0 0 10px!important}\n.skb04-plate h2{color:#f6ecd0!important;font-size:34px!important;margin:0 0 4px!important;letter-spacing:.08em!important;text-transform:uppercase;text-shadow:0 2px 0 #163021}\n.skb04-plate .sub{color:var(--brass-l)!important;font-style:italic;font-size:18px!important;margin:0 0 16px!important}\n.skb04-plate .rule{height:1px;background:var(--brass);opacity:.7;margin:0 auto 16px!important;width:70%}\n.skb04-plate p.lead{color:#e9e2cb!important;font-size:16px!important;max-width:820px;margin:0 auto!important}\n.skb04-tags{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;margin:20px 0 0!important}\n.skb04-tag{border:1px solid var(--brass);border-radius:8px;padding:10px 6px!important;text-align:center;background:rgba(0,0,0,.12)}\n.skb04-tag b{display:block;color:#f6ecd0!important;font-size:19px!important;font-family:Georgia,serif!important}\n.skb04-tag span{font-family:Arial,Helvetica,sans-serif!important;font-size:11.5px!important;letter-spacing:.06em;color:var(--brass-l)!important;text-transform:uppercase}\n\n\/* story *\/\n.skb04-story{max-width:none;margin:0!important}\n.skb04-story p:first-of-type:first-letter{float:left;font-size:54px;line-height:.9;padding:6px 8px 0 0;color:var(--g);font-weight:700}\n.skb04-quote{border-top:1px solid var(--brass);border-bottom:1px solid var(--brass);padding:16px 8px!important;margin:22px 0!important;text-align:center;font-style:italic;font-size:20px!important;color:var(--gd)!important}\n\n\/* catalog plates *\/\n.skb04-plates{display:grid;grid-template-columns:1fr;gap:12px}\n.skb04-pl{background:#fbf6e8;border:1px solid var(--paper-d);border-left:4px solid var(--g);border-radius:4px;padding:14px 16px!important}\n.skb04-pl .no{font-family:Arial,Helvetica,sans-serif!important;font-size:11px!important;letter-spacing:.2em;color:var(--brass)!important;font-weight:700;display:block;margin-bottom:2px}\n.skb04-pl b{display:block;color:var(--gd)!important;font-size:17px!important;margin-bottom:4px}\n.skb04-pl span.t{font-size:15.5px!important;line-height:1.6}\n\n\/* hit and miss rhythm *\/\n.skb04-rhythm{display:flex;justify-content:center;gap:6px;flex-wrap:wrap;margin:6px 0 14px!important;font-family:Arial,Helvetica,sans-serif!important}\n.skb04-rhythm span{padding:6px 10px!important;border-radius:20px;font-size:13px!important;letter-spacing:.1em;text-transform:uppercase;font-weight:700}\n.skb04-rhythm .h{background:var(--wood);color:#fff!important}\n.skb04-rhythm .m{border:1px dashed var(--g);color:var(--g)!important}\n\n\/* build box *\/\n.skb04-build{display:grid;grid-template-columns:1fr;gap:10px;margin:8px 0 6px}\n.skb04-build div{background:var(--g);color:#f2ead2!important;border-radius:6px;padding:14px!important;text-align:center}\n.skb04-build b{display:block;color:var(--brass-l)!important;font-size:20px!important;font-family:Georgia,serif!important}\n.skb04-build span{font-size:14.5px!important;color:#f2ead2!important}\n\n.skb04-video{position:relative;width:100%;max-width:340px;margin:8px auto 10px!important;aspect-ratio:9\/16;border-radius:10px;overflow:hidden;background:#000;border:3px solid var(--brass)}\n.skb04-video iframe{position:absolute;top:0;left:0;width:100%!important;height:100%!important;border:0}\n\n\/* spec sheet *\/\n.skb04-sheet{background:#fbf6e8;border:2px solid var(--gd);border-radius:4px;padding:6px 14px!important;max-width:none;margin:0!important}\n.skb04-sheet table{width:100%!important;border-collapse:collapse!important;font-size:15px!important}\n.skb04-sheet th,.skb04-sheet td{border:none!important;border-bottom:1px dotted #a99c7a!important;padding:10px 4px!important;text-align:left!important;vertical-align:top!important;background:none!important}\n.skb04-sheet tr:last-child th,.skb04-sheet tr:last-child td{border-bottom:none!important}\n.skb04-sheet th{width:40%;font-family:Arial,Helvetica,sans-serif!important;font-size:12px!important;letter-spacing:.08em;text-transform:uppercase;color:var(--wood)!important;font-weight:700!important}\n.skb04-sheet td{color:var(--ink)!important}\n\n.skb04 details.skb04-specs{border:2px solid var(--gd)!important}\n.skb04 details.skb04-specs summary{text-align:center;font-family:Arial,Helvetica,sans-serif!important;font-size:13px!important;letter-spacing:.14em;text-transform:uppercase;color:var(--gd)!important}\n.skb04 details.skb04-specs .skb04-sheet{border:none!important;border-top:1px solid var(--paper-d)!important;border-radius:0}\n\n.skb04 details ol.skb04-faqlist{padding:0 16px 4px 34px!important;margin:0 0 10px!important}\n.skb04 details ol.skb04-faqlist li{font-size:15.5px!important;margin:0 0 8px!important}\n.skb04 details ul.skb04-faqlist{padding:0 16px 4px 16px!important;margin:0 0 10px!important}\n.skb04 details ul.skb04-faqlist li{font-size:15.5px!important}\n\n\/* gift *\/\n.skb04-gift{border:2px dashed var(--wood);border-radius:8px;padding:18px!important;margin:30px 0 0!important;background:#fff8ea;text-align:center}\n.skb04-gift .lab{display:inline-block;background:var(--org);color:#fff!important;font-family:Arial,Helvetica,sans-serif!important;font-size:11.5px!important;letter-spacing:.18em;text-transform:uppercase;font-weight:700;padding:5px 12px!important;border-radius:3px;margin-bottom:10px!important}\n.skb04-gift p{margin:0 0 8px!important}\n\n.skb04 ul{margin:0 0 14px 0!important;padding:0!important;list-style:none!important}\n.skb04 ul li{margin:0 0 10px!important;font-size:16px!important;padding-left:22px!important;position:relative}\n.skb04 ul li:before{content:\"✦\";position:absolute;left:0;top:1px;color:var(--brass);font-size:13px}\n.skb04-box{display:grid;grid-template-columns:1fr;gap:14px;margin:0!important}\n.skb04-box\u003ediv{background:#fbf6e8;border:1px solid var(--paper-d);border-radius:4px;padding:16px!important}\n.skb04-box h3{font-size:15px!important;font-family:Arial,Helvetica,sans-serif!important;letter-spacing:.12em;text-transform:uppercase;color:var(--wood)!important;margin:0 0 10px!important}\n\n.skb04 details{background:#fbf6e8;border:1px solid var(--paper-d);border-radius:4px;margin:0 0 10px!important;max-width:none;padding:0!important}\n.skb04 summary{cursor:pointer;font-weight:700!important;padding:14px 16px!important;list-style:none;color:var(--gd)!important;font-size:16px!important}\n.skb04 summary::-webkit-details-marker{display:none}\n.skb04 summary::after{content:\"+\";float:right;color:var(--brass);font-weight:700;font-size:20px;line-height:1}\n.skb04 details[open] summary::after{content:\"–\"}\n.skb04 details p{padding:0 16px 14px!important;margin:0!important;font-size:15.5px!important}\n\n@media(min-width:750px){\n.skb04-in{padding:0 36px!important}\n.skb04-hero{padding:34px 34px 38px!important}\n.skb04-plate{padding:40px 40px 32px!important}\n.skb04-plate h2{font-size:46px!important}\n.skb04-tags{grid-template-columns:repeat(4,1fr)}\n.skb04-plates{grid-template-columns:1fr 1fr}\n.skb04-build{grid-template-columns:repeat(3,1fr)}\n.skb04-box{grid-template-columns:1fr 1fr}\n.skb04 h2{font-size:30px!important}\n}\n\u003c\/style\u003e\n\n\u003cdiv class=\"skb04\"\u003e\n\n\u003c!-- COMING SOON BANNER --\u003e\n\u003cdiv class=\"skb04-soon\"\u003e\n\u003cdiv class=\"skb04-soon-in\"\u003e\n\u003cp class=\"k\"\u003eComing Late October\u003c\/p\u003e\n\u003cp class=\"t\"\u003eNow in final testing\u003c\/p\u003e\n\u003cp class=\"d\"\u003eThe B04 is being test-run before release at the end of October. Be the first to know when it launches, and don't miss the first-batch gift.\u003c\/p\u003e\n\u003ca class=\"skb04-soon-btn\" href=\"https:\/\/www.stirlingkit.com\/products\/retrol-x-okmo-b04-air-cooled-hit-and-miss-engine-model-kit-farm-engine\"\u003eNotify Me\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- NAMEPLATE HERO --\u003e\n\u003cdiv class=\"skb04-hero\"\u003e\n\u003cdiv class=\"skb04-plate\"\u003e\n\u003cp class=\"tl\"\u003eAir-Cooled · Hit \u0026amp; Miss · DIY Kit\u003c\/p\u003e\n\u003ch2\u003eOKMO B04\u003c\/h2\u003e\n\u003cp class=\"sub\"\u003eA 1910s farm engine, built for your desk\u003c\/p\u003e\n\u003cdiv class=\"rule\"\u003e\u003c\/div\u003e\n\u003cp class=\"lead\"\u003eA working miniature of the little air-cooled Chore Boy, the engine that did the chores on American farms and, under the Amanco name, on British ones too. Belt-driven fan, finned cylinder, glass drip oiler and twin spoked flywheels. Build it yourself, then hear it run.\u003c\/p\u003e\n\u003cdiv class=\"skb04-tags\"\u003e\n\u003cdiv class=\"skb04-tag\"\u003e\n\u003cb\u003e3.6 cc\u003c\/b\u003e\u003cspan\u003e16 × 19 mm\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"skb04-tag\"\u003e\n\u003cb\u003eAir-Cooled\u003c\/b\u003e\u003cspan\u003eFins + belt fan\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"skb04-tag\"\u003e\n\u003cb\u003eDIY Kit\u003c\/b\u003e\u003cspan\u003eAbout 2 hours\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"skb04-tag\"\u003e\n\u003cb\u003e225 mm\u003c\/b\u003e\u003cspan\u003eDesktop size\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003cdiv class=\"skb04-in\"\u003e\n\n\u003c!-- STORY --\u003e\n\u003cspan class=\"skb04-kick\"\u003eA Bit of History\u003c\/span\u003e\n\u003ch2\u003eThe Hired Hand Every Farm Could Afford\u003c\/h2\u003e\n\u003cp class=\"skb04-orn\"\u003e✦ ✦ ✦\u003c\/p\u003e\n\u003cdiv class=\"skb04-story\"\u003e\n\u003cp\u003eBefore power lines reached the countryside, a small engine like this was the hardest worker on the farm. Built in the American Midwest in the 1910s, these little \"chore\" engines pumped water, ground feed, turned cream separators and sawed wood, day after day, for families who couldn't afford a hired hand.\u003c\/p\u003e\n\u003cp\u003eThey weren't fancy. They were plain, honest machines, but they started, they kept running, and they cost far less than the big engines of the day. For many families they were the first taste of mechanical power. Thousands crossed the Atlantic to work on British farms, where they earned the same loyal following.\u003c\/p\u003e\n\u003cp\u003eThe air-cooled versions were especially practical. With no water hopper, there was nothing to freeze in winter and less weight to carry around the yard. Cooling fins and a small belt-driven fan did the job instead.\u003c\/p\u003e\n\u003cp class=\"skb04-quote\"\u003e\"Pop… whoosh, whoosh… pop.\"\u003cbr\u003e\u003cspan style=\"font-size:15px;font-style:normal\"\u003eTo many people, that is the sound of a grandparent's farm.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eA century later, the farmers are gone but the engines are not. Collectors restore them and run them at shows, and they remain among the most collected vintage engines in the UK. The B04 brings that sound to your desk.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- HIT AND MISS --\u003e\n\u003cspan class=\"skb04-kick\"\u003eHow It Runs\u003c\/span\u003e\n\u003ch2\u003eFire When Needed, Coast When Not\u003c\/h2\u003e\n\u003cp class=\"skb04-orn\"\u003e✦ ✦ ✦\u003c\/p\u003e\n\u003cdiv class=\"skb04-rhythm\"\u003e\n\u003cspan class=\"h\"\u003eHit\u003c\/span\u003e\u003cspan class=\"m\"\u003eMiss\u003c\/span\u003e\u003cspan class=\"m\"\u003eMiss\u003c\/span\u003e\u003cspan class=\"m\"\u003eMiss\u003c\/span\u003e\u003cspan class=\"h\"\u003eHit\u003c\/span\u003e\u003cspan class=\"m\"\u003eMiss\u003c\/span\u003e\u003cspan class=\"m\"\u003eMiss\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cp style=\"text-align:center;max-width:none;margin:0 auto 14px!important\"\u003eA hit-and-miss engine has no throttle. When the flywheels spin fast enough, the governor holds the exhaust valve open and the engine coasts without firing. That's the \"miss.\" As the flywheels slow, the valve closes and the engine fires again: the \"hit.\"\u003c\/p\u003e\n\u003cdiv class=\"skb04-video\"\u003e\u003ciframe src=\"https:\/\/www.youtube.com\/embed\/Y4R1l3OUuhI\" title=\"OKMO B04 hit and miss engine starting and running\" loading=\"lazy\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen\u003e\u003c\/iframe\u003e\u003c\/div\u003e\n\n\u003c!-- BUILD --\u003e\n\u003cspan class=\"skb04-kick\"\u003eThe Build\u003c\/span\u003e\n\u003ch2\u003eBuild It, Then Hear It Run\u003c\/h2\u003e\n\u003cp class=\"skb04-orn\"\u003e✦ ✦ ✦\u003c\/p\u003e\n\u003cp style=\"text-align:center;max-width:none;margin:0 auto 16px!important\"\u003eBuilding the B04 is half the fun. Watch the fan drive, timing gears and ignition come together, then hear the first \"pop\". It's the best way to learn how an early farm engine really works.\u003c\/p\u003e\n\u003cdiv class=\"skb04-build\"\u003e\n\u003cdiv\u003e\n\u003cb\u003eCNC\u003c\/b\u003e\u003cspan\u003ePrecision-machined metal parts, made to fit\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003eManual\u003c\/b\u003e\u003cspan\u003eStep by step: assembly, wiring and first start\u003c\/span\u003e\n\u003c\/div\u003e\n\u003cdiv\u003e\n\u003cb\u003e~2 Hours\u003c\/b\u003e\u003cspan\u003eFrom box to first run\u003c\/span\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\n\u003c!-- SPEC SHEET --\u003e\n\u003cspan class=\"skb04-kick\"\u003eSpecification Sheet\u003c\/span\u003e\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cp class=\"skb04-orn\"\u003e✦ ✦ ✦\u003c\/p\u003e\n\u003cdetails class=\"skb04-specs\"\u003e\u003csummary\u003eView Full Specifications\u003c\/summary\u003e\n\u003cdiv class=\"skb04-sheet\"\u003e\n\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003ctd\u003eOKMO B04\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEngine type\u003c\/th\u003e\n\u003ctd\u003eHorizontal single-cylinder, 4-stroke, hit-and-miss\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eInspired by\u003c\/th\u003e\n\u003ctd\u003e1910s air-cooled Chore Boy (sold in Britain as Amanco)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDisplacement\u003c\/th\u003e\n\u003ctd\u003e3.6 cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eBore × stroke\u003c\/th\u003e\n\u003ctd\u003e16 mm × 19 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSpeed range\u003c\/th\u003e\n\u003ctd\u003e500–3,000 rpm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCooling\u003c\/th\u003e\n\u003ctd\u003eAir-cooled: cylinder fins + belt-driven fan\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIgnition\u003c\/th\u003e\n\u003ctd\u003eMechanical contact igniter + CDI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIgnition power\u003c\/th\u003e\n\u003ctd\u003e1 × AA 1.5V battery\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubrication\u003c\/th\u003e\n\u003ctd\u003eAdjustable glass drip oiler + oil mixed in fuel (splash lubrication, no oil pump)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFuel\u003c\/th\u003e\n\u003ctd\u003eGasoline, 92\/95 octane or higher\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eEngine oil\u003c\/th\u003e\n\u003ctd\u003e2T or 4T engine oil, mixed into the fuel\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFuel-to-oil ratio\u003c\/th\u003e\n\u003ctd\u003e25:1 – 30:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStarting\u003c\/th\u003e\n\u003ctd\u003eFlick the flywheel quickly by hand (clockwise), or use an electric drill with the starting rod\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePower output\u003c\/th\u003e\n\u003ctd\u003eBelt pulley\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMain material\u003c\/th\u003e\n\u003ctd\u003eCNC-machined metal\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDimensions\u003c\/th\u003e\n\u003ctd\u003e225 × 115 × 130 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eAssembly\u003c\/th\u003e\n\u003ctd\u003eDIY kit (assembly required)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/details\u003e\n\n\u003c!-- GIFT --\u003e\n\u003cdiv class=\"skb04-gift\"\u003e\n\u003cspan class=\"lab\"\u003eFirst-Batch Gift\u003c\/span\u003e\n\u003cp\u003eTo thank our first-batch customers for their support, we'll include a miniature vintage-style double-wick oil lamp free with every first-batch B04. With its wire handle and twin spouts, it's a nice finishing touch for your farm-engine display. It comes in brass or black, and the color is chosen at random. Please note: it's a decorative display piece and is not meant to be lit. After the first batch, it will be sold as an optional accessory.\u003c\/p\u003e\n\u003cp style=\"margin:0!important;font-size:15px!important\"\u003eAlso available: a vintage-style vertical water pump that runs from the B04's pulley.\u003c\/p\u003e\n\u003c\/div\u003e\n\n\u003c!-- FAQ --\u003e\n\u003cspan class=\"skb04-kick\"\u003eQuestions\u003c\/span\u003e\n\u003ch2\u003eCommon Questions\u003c\/h2\u003e\n\u003cp class=\"skb04-orn\"\u003e✦ ✦ ✦\u003c\/p\u003e\n\u003cdetails\u003e\u003csummary\u003eWhen will it ship?\u003c\/summary\u003e\u003cp\u003eThe B04 isn't on sale yet. It's currently in production and final testing, and we plan to open orders at the end of October. Production is expected to be completed and orders shipped before the end of December. Click \u003cb\u003eNotify Me\u003c\/b\u003e to be the first to know when it launches, and follow Stirlingkit for production updates.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes it arrive assembled? Is it suitable for beginners?\u003c\/summary\u003e\u003cp\u003eThe B04 is a modular kit, so it arrives partly assembled, and it makes a good first engine kit. Every part that needs fine adjustment is pre-assembled and adjusted at the factory, including the timing gear \u0026amp; governor and the cylinder head valve gear with its contact igniter. You won't have to set valve clearance or ignition timing yourself. Simply put the modules together, connect the fan drive and wiring, then add battery, fuel and oil and follow the manual for the first start. No special tools or machining skills are needed, and most builders finish in about 2 hours. Like any real engine, it may take a few tries to get the fuel setting right on the first start. That's normal, and part of the fun.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat's in the box?\u003c\/summary\u003e\u003cp\u003eThe OKMO B04 engine kit, hardwood base and assembly manual. Not included: AA battery, gasoline and engine oil.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I start it?\u003c\/summary\u003e\n\u003col class=\"skb04-faqlist\"\u003e\n\u003cli\u003e\n\u003cb\u003eMix the fuel.\u003c\/b\u003e Use 92\/95 octane gasoline with 2T or 4T engine oil at 25:1 – 30:1. The oil travels with the fuel to lubricate the engine, so there's no separate oil pump.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCheck the drip oiler.\u003c\/b\u003e Air-cooled engines rely on lubrication more than water-cooled ones. Check the oil level before each run.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFit the battery.\u003c\/b\u003e Put 1 × AA 1.5V battery in the battery box and switch it on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eStart it.\u003c\/b\u003e Flick the flywheel quickly by hand (clockwise), or use an electric drill with the starting rod.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWon't start?\u003c\/b\u003e It may be flooded. Follow the manual to clear it before trying again.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cb\u003eWhile it runs:\u003c\/b\u003e with no water jacket, long high-speed runs build heat, so run it in sessions and feel the cylinder temperature. The exhaust gets very hot. Run it in a ventilated space away from anything flammable. After running, top up or drain the drip oiler.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs it easy to maintain?\u003c\/summary\u003e\u003cp\u003eYes. The ignition contacts are in plain view, so wear, oil build-up or a changed gap can be spotted by eye and fixed by hand.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs the B04 an exact replica of the original engine?\u003c\/summary\u003e\u003cp\u003eIt is a miniature inspired by the 1910s air-cooled Chore Boy (Amanco in Britain). To stay as close as possible to the original, it recreates these details:\u003c\/p\u003e\n\u003cul class=\"skb04-faqlist\"\u003e\n\u003cli\u003e\n\u003cb\u003eBelt-driven fan.\u003c\/b\u003e A working fan beside the cylinder head, driven by a belt from the flywheel, that blows air over the fins just like the original. On the B04 it's brass, so it stays in plain view.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFinned horizontal cylinder.\u003c\/b\u003e Deep cooling fins in place of a water hopper.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eMushroom-top stack.\u003c\/b\u003e The tall stack with its domed cap, taken from the original's silhouette.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGlass drip oiler.\u003c\/b\u003e Adjustable and see-through, so you can watch the oil feed drop by drop.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eExposed timing gears \u0026amp; igniter.\u003c\/b\u003e Brass half-speed cam gears and a visible contact igniter.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTwin spoked flywheels.\u003c\/b\u003e Green spokes with bright rims that carry the engine through its \"miss\" cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBattery box on the base.\u003c\/b\u003e Like the original, the battery sits on the base, here in a dovetailed hardwood box with a toggle switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eBelt-pulley output.\u003c\/b\u003e Like the farm engines that once drove pumps and grinders, it can power small machines.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eSome details, such as the hardwood base and battery box, are designed for desktop display.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eCan it power other models?\u003c\/summary\u003e\u003cp\u003eYes. The belt pulley lets the B04 drive small accessories, such as the optional vintage-style vertical water pump.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Stirlingkit","offers":[{"title":"Default Title","offer_id":67791915679957,"sku":null,"price":0.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0134\/7446\/3808\/files\/stirlingkit-retrol-x-okmo-b04-air-cooled-hit-and-miss-engine-model-kit-farm-engine_5.jpg?v=1792141346","url":"https:\/\/www.stirlingkit.com\/ko\/products\/retrol-x-okmo-b04-air-cooled-hit-and-miss-engine-model-kit-farm-engine","provider":"Stirlingkit","version":"1.0","type":"link"}