do-work-son Posted May 2, 2014 Report Share Posted May 2, 2014 Every piston I have seen has a size on it and a series number the 72 is bore size Quote Link to comment Share on other sites More sharing options...
clrkaw26 Posted May 2, 2014 Author Report Share Posted May 2, 2014 Also while I have the head off I measured the stroke like suggested and I'm getting 57.150 mm. Stock shows 54 and 57.150 is just shy of +4, is this a + 4 crank? Quote Link to comment Share on other sites More sharing options...
clrkaw26 Posted May 2, 2014 Author Report Share Posted May 2, 2014 Mine says 100 and that's it. Nothing else Quote Link to comment Share on other sites More sharing options...
oldskool Posted May 2, 2014 Report Share Posted May 2, 2014 Since you have head off, measure bore and stroke. If your piston comes above cylinder deck about 2mm, you got a +4mil crank. Wait a minute. Do you see a spacer plate between cylinders and case? A spacer would also indicate a stroked crank Quote Link to comment Share on other sites More sharing options...
clrkaw26 Posted May 2, 2014 Author Report Share Posted May 2, 2014 I do not see a spacer. But I did measure approximately 57.150 mm stroke from top to bottom. Quote Link to comment Share on other sites More sharing options...
clrkaw26 Posted May 2, 2014 Author Report Share Posted May 2, 2014 Update, I pulled the jug and the inside of the piston says prox31k and the crank has an N on one side and it looks like 28L or 29L on the other, do you know what this means? Quote Link to comment Share on other sites More sharing options...
sstaton1983 Posted May 2, 2014 Report Share Posted May 2, 2014 take a pic of the top of the piston and post it . I cant find anything with number. Quote Link to comment Share on other sites More sharing options...
clrkaw26 Posted May 2, 2014 Author Report Share Posted May 2, 2014 I have tried a few times to post pics but it always say file too large. Quote Link to comment Share on other sites More sharing options...
clrkaw26 Posted May 2, 2014 Author Report Share Posted May 2, 2014 Ok, I think what I have is a 1mm bore to 65mm cylinders and pro x pistons on a stock crank with some port work, thanks to all snd if you think this is incorrect please inform. Quote Link to comment Share on other sites More sharing options...
2004LEBanshee Posted May 3, 2014 Report Share Posted May 3, 2014 There is either a spacer plate or cut domes. If there is cutdomes the piston will stick out past the deck of the cylinders. Easy to see. Quote Link to comment Share on other sites More sharing options...
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