Thank's for the input guys.

You really don't believe that 15% Nitro fuel will work on the OS 46ax with the addition of a tuned pipe? I'm to understand that it is possible the surge/misfire I'm encountering could actually be detonation caused by too much compression or Nitro?

If no amount of enriching or switching to a colder plug will help, would the addition of a 2nd head gasket work?

Initially I was curious as to why the throttle seemed not to retract. Now the issue is the surge/misfire.

Thanks

Tommy D