Retrol HM-01 Hit & Miss engine. In 2023 I pre-ordered a Retrol HM-01 hit and miss engine from Enginediy which I knew would take a couple of months for delivery because it was still in pre production. I was happy to wait and I was kept informed of progress and expected delivery. It duly arrived very well packed and beautifully made. This was my first attempt at building an engine but it went together perfectly. The instructions were mainly pictorial and a little more written description would have helped but all my questions were promptly answered by their excellent service department. I have been running this engine for four months now and I’m delighted with the design and quality. I would certainly recommend Enginediy and will be using them again.

Fantastic Fantastic! This is the 4th project I've purchased from EngineDIY and I have enjoyed each and everyone. The Rotary 5 Cylinder, the Fighter Jet Engine, the V8 Flat Plane Crankshaft Engine and now the Turbofan Jet Engine. This particular model project is made from all metal parts with precision fitment and provides 20+ hours of assembly enjoyment. All of these projects are in lighted displays in my home and are enjoyed by friends and family. Especially noteworthy is all these models "run" by rechargable battery. Watching pistons, gears, propellers and machine parts move is awesome! I've been purchasing from this outfit for 4 years and look forward to future kits.

Happy customer!! I ordered a little air cooled petrol hit and miss Oddball engine. Received my order very soon end very well packed. The M96 Mini Horizontal Air-Cooled Single-Cylinder 4-Stroke Oddball Hit and Miss Gas Engine runs very good right out of the box. I’m a very happy customer!

Successful Christmas because of enginediy! My mom really wanted to find something for my son to build. He told her he’s interested in doing something with his hands for a career vs “going to college”. My husband is a mechanical engineer and their brains work pretty similarly. I was so happy to stumble upon enginediy.com. We decided on a small one as he is only 12. He built it pretty quickly and LOVED getting it to run successfully! It’s a combustion engine and we already need to go buy more wick for it! I’m glad he will have something to set on his desk for a very long time.

No customer service & they delete negative reviews I've made several orders from them and always got what I ordered. One expensive item (<$1K) arrived with some inexpensive parts missing. I provided them with the prod #, missing parts#, part description, & photos from their assembly manual. Many emails were exchanged. Still, the service tech was unable to correctly identify the part. He guessed at it and twice sent me the wrong parts and then gave up. When I wrote a negative review, they pulled it off their site.