Originally Posted by
snookums
Russel my .28 red head seems to be misfiring. I was running around the local race track yesterday and there were no problems on the first 3 tanks, then it started misfiring after that - it even stalls when it misfires. Put in a new plug but still the same. Using Cosmo 25% fuel from Japan. Oh the misfire stops though after the temp goes up but it seems to be a little down on power.
I'm going to take the engine apart this week to eyeball it then give it a general cleaning, but was just wondering if anyone ever experienced this before and would know what caused it. Thanks
Be sure to use a new plug, I'm sure you did that but just saying, after you check out the internale just be sure to use the extra shim included in the box, and be sure the back plate and head bolts are tight. Can you get 30%?, be sure the botton and piston don't look pitted if so then the nitro % is not correct for the deck height. I have had this happen and once i installed the shim and retightened the backplate and head bolts it was all good, hope this helps