Stirlingkit User Guide

Thank you to every builder who has run an HM-01 and taken the time to share feedback with us. Many of you told us what could be easier, from mounting the flywheels to finding the right battery for the ignition. We listened, worked with RETROL, and decided to update the...

We have recently received feedback from some customers regarding the performance of the HM-01 CDI system. To ensure transparency and help you resolve any issues quickly, we would like to provide a clear explanation along with our current solutions.   🔧 HM-01 Starting Issue Troubleshooting Guide If you are experiencing...

The Retrol HM01 is a 7cc, horizontal single-cylinder, four-stroke Hit & Miss engine designed for hobbyists and collectors. It features a 20mm cylinder diameter and 22mm stroke, uses an evaporative water-cooling system, and is lubricated with mixed oil via an oil cup (recommended gasoline-oil ratio 1:25). The engine starts manually...

What is the Musa hm01 engine known for in terms of design? Answer: The Musa hm01 engine is known for its meticulous design, high-quality craftsmanship, and attention to detail.   How does the Musa hm01 compare to other hit and miss engines in terms of quality?   Answer: According to...