another bore question

[ogre03]

I did a search, and I know there are many bore dimension questions in past threads. But mine is a little too specific to get a good answer by reading them... I tried.

I measured out my cylinders, to find out what the bore is on them.

(I bought the bike used) I came up with 2.531" which I believe is 64.26mm. correct me if I'm wrong please. I was told that that is a stock bore. I know 64mm is stock, but being 64.26mm can anyone tell me if I need to bore it more to a specific size or just hone it? I'm going to take it in and have the engine shop measure it but, I figure it's best to have an idea of what I'm talking about before I go in there.

[PassionRE]

Your cylinders are bored to .25mm(.010") over. Finished honed spec for this piston size is 2.530" for a finished piston/ bore clearance of .003". You need to have the bores measured in several locations up and down, side to side to check the trueness of your bore. You are currently at a clearance spec of .004"(based on Wiseco replacement pistons) which is ok as long as the bore is true and has no low spots(especially above the exhaust ports). Also make sure all the port chamfers are sufficient, particularly on the top edge and top corners of the exhaust ports, but all ports should be chamfered properly and good cross-hatch pattern is in place for proper ring seating on break-in. Refrain from synthetic lubricants for the first 2 gallons of fuel on break-in after re-ringing....Jim

[ogre03]

thanks jim, like I said I'm going to take it in, and have it measured and bored/honed, but I hate taking my stuff to someone and not knowing what is going on. Thanks again