herb Posted February 10, 2015 Report Share Posted February 10, 2015 I have a 2003 banshee, i just took it apart for a rebuild, it only had roughly 100psi in each cylinder. the problem i am running into is they are stock pistons "64mm" or "2.51969inches" but when i measured the cylinder wall it is 2.5205 inches is that to big for stock pistons? do i need to bore? Quote Link to comment Share on other sites More sharing options...
registered user Posted February 10, 2015 Report Share Posted February 10, 2015 i think one of your measurments is alittle off or you mistyped Quote Link to comment Share on other sites More sharing options...
Surfrjag Posted February 10, 2015 Report Share Posted February 10, 2015 Weisco calls for .002" pw clearance im pretty sure Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted February 10, 2015 Report Share Posted February 10, 2015 It depends some call for .002 some .003 . You really need to use a bore guage . I take take the caliper set it up on piston skirt , set my bore guage in caliper and then check cylinder in a few spots . The bore guage will tell u if the clearance is within spec and if cylinder is egged. I have seen a lot of bores clearance well till u get just above ex port then all of a sudden bam .005-.006 I usually check a bore in 4-5 spots Quote Link to comment Share on other sites More sharing options...
registered user Posted February 11, 2015 Report Share Posted February 11, 2015 herb 64mm is the nominal size. actual diameter will be different. to check 1 or 2 pistons the tools arent worth buying or worth learning how to use them. go to a local machine shop with a 6pak and they should do it Quote Link to comment Share on other sites More sharing options...
herb Posted February 13, 2015 Author Report Share Posted February 13, 2015 alright thanks guys im gona take them to a local shop, an also if i get porting done and get a cool head with 21cc domes, can i still run my stock crank? i just dont wana put money into it then the crank bearings go out or the crank. Quote Link to comment Share on other sites More sharing options...
herb Posted February 13, 2015 Author Report Share Posted February 13, 2015 alright thanks Quote Link to comment Share on other sites More sharing options...
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