87bansheepnw Posted March 11, 2014 Report Share Posted March 11, 2014 i pulled my head off my 87 banshee to check it out and it has factory pistons i believe, the only mark on them is a arrow and a "G" my compression was at 116 both cylinders even, i have a small amount of wiggle in the pistons but i know a little is ok, my Q is should i rering this thing or what? it runs really good.. Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted March 11, 2014 Report Share Posted March 11, 2014 If your really that worried take the topend off and have it measured to see if you need pistons Quote Link to comment Share on other sites More sharing options...
SAVAGE420 Posted March 11, 2014 Report Share Posted March 11, 2014 116 is fine. I ran my stock cyls/pistons down to 85/90psi. Still ran great, i only rebuilt because i was going bigger and porting.... Just check it ever so often. Quote Link to comment Share on other sites More sharing options...
87bansheepnw Posted March 11, 2014 Author Report Share Posted March 11, 2014 thanks for the quick replys, now the only thing im worried about is the rod bearings, but im guessing if this has stock pistons from 87 it cant have that many hours on it so the bearings should be ok, if it blows ill just go ported 4 mil lol, just dont want it to break a day into a week long dune trip Quote Link to comment Share on other sites More sharing options...
87bansheepnw Posted March 11, 2014 Author Report Share Posted March 11, 2014 how much does a cool head with 21cc domes raise comp? im thinking about getting one Quote Link to comment Share on other sites More sharing options...
uman1030 Posted March 11, 2014 Report Share Posted March 11, 2014 around 20-25 psi give or take. on a stock stroke/bore engine when going from stock head. depending on altitude. the higher the altitude the less it raises the compression. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.