MAN reviewed the ASP engines when they were first released and found that it took 2 head shims to allow even 5% nitro to be used without detonation. I did not believe them and tried it on 5 percent with no shims.The engine would not run right, it overheated and it blew out glow plugs on every attempt to run it. Just engines is/was the distributer for ASP and I tried to get shims from them, but they did not have any for that old of an engine. So, FAI, no nitro fuel is it for my ASP and it runs great for me!!

Regards,

Richard