Finch Posted December 12, 2011 Report Posted December 12, 2011 (edited) well i just pulled my head off since i had low compression i was at 90. 100 is what noss says for my elevation. but what im wondering is boring and hone really a necessity cylinders were smooth no scratches or anything. pistons dont look to bad still stock. more or less wondering if i should do just ring or wondering what you guys suggest i put a cool head on i ordered not gonna take it out till i do rebuild. just didnt wanna leave it uncovered in winter, but the cool head with 19cc domes did up me to to around 120 only saying around because compression gauge threads are a little bit shorter then plugs any input would be nice thank you. Edited December 12, 2011 by mikefi01shee Quote
ap3x Posted December 12, 2011 Report Posted December 12, 2011 (edited) the bore and pistons could look fine, but you have to mic both of them from multiple spots and calculate your clearance between the two. Too much, and you need to get bored out to the next size. Edited December 12, 2011 by ap3x Quote
Finch Posted December 12, 2011 Author Report Posted December 12, 2011 the bore and pistons could look fine, but you have to mic both of them from multiple spots and calculate your clearance between the two. Too much, and you need to get bored out til the next size. its .03 right for clearance? Quote
bansheesandrider Posted December 12, 2011 Report Posted December 12, 2011 its .03 right for clearance? More like .003 and maybe even less, but definitely not .03 Quote
Finch Posted December 12, 2011 Author Report Posted December 12, 2011 More like .003 and maybe even less, but definitely not .03 good thing i checked. haha Quote
Jereme6655 Posted December 12, 2011 Report Posted December 12, 2011 also as it was mentioned that it might LOOK ok.....the cylinder could also be egg shaped. Quote
themechanic Posted December 13, 2011 Report Posted December 13, 2011 check the side clearance with a feeler gauge if its not perfect. then take the cyls to a machinist as the proper gauges are expensive. as a rule of thumb if its apart cast sleeves need to be bored. Quote
rocky_mtn_yamaha Posted December 17, 2011 Report Posted December 17, 2011 Even if they're still true, I'd still at least slap a hone job on it if it's apart. But I have yet to be into a motor without having the machine shop punch it out to the next size. You'll be happy you did the minute you pickup the freshly machined parts. Quote
Finch Posted December 17, 2011 Author Report Posted December 17, 2011 Even if they're still true, I'd still at least slap a hone job on it if it's apart. But I have yet to be into a motor without having the machine shop punch it out to the next size. You'll be happy you did the minute you pickup the freshly machined parts. well im within the clearance and i dont have to worry about someone honing than it being to big do i? ive had a few people to be weary about that if the hone it to much... just curious Quote
Jereme6655 Posted December 17, 2011 Report Posted December 17, 2011 no you dont need to worry about honing it too much. you would be standing there for a LONG time with a hone to take out enough metal to goof things up. Hones are actually just meant to knock down the edges of machined metal. If you have ever looked at a electron micro-scope photo of metal from a cyliner after its been bored you would probably be horrified...it looks like jagged, serated blade knife edges......then you see it after its been chased with a hone.....totally different... all the sharp edges are knocked down/off and the ones that do remain have a rounded end on them. pretty wild to see actually. Quote
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