Originally Posted by
JustinL7294
I was given a used nova N21BF that runs but having some trouble with tunning and idling, rough starts. I took the head button off an noticed that there are no head shims. would that cause my problems? using 20% nitro
1. yes it would
2. are you sure the head shims aren't just hiding out, playing chameleon? Sometimes they get stuck on there and are hard to spot.