The site rcfaq.com has an engine conversion page and on that page is a Homlite hopup spec. That is where I got the numbers to modify my engine. I have had a problem. When I removed the excess material on the front of the engine I removed the webbing also and had a clean lite case. I found that at the power I now have that I removed too much material. The webbing needs to stay on the front of the case. I have broken two cases at the main bearing boss. I can send a picture if you are interested. Profg