I think most of the problems are lousy fit issues. Even OS has to semi fit their parts on the line. Magnum and ASP seem to just assemble engines without any attention spent to a few minutes of hand fitting/measuring parts.

W8YE gave me an older ASP 40 that is in very good condition. I talked to Just Engines and there are no parts for it anymore. Jim said it will be the most powerful 40 I've run when I get it on the stand.

Evolution glow engines are also Sanye made. They don't have those problems for the most part.