Posts
3282
Joined
12/31/2009
Location
CA
Fantasy
710th
Edited Date/Time
5/18/2016 2:40pm
Ok boys,
Put down your tinfoil hats and riddle me this: I took my top end off and went on to the Bud Racing Website to look for a replacement while I also needed to order a gasket for a bud racing head, and there are five different bore sizes that come up, from 53.93 to 53.97. What gives? It is a stock bore. How do I know which one to buy?
Thanks for any and all advice.
Put down your tinfoil hats and riddle me this: I took my top end off and went on to the Bud Racing Website to look for a replacement while I also needed to order a gasket for a bud racing head, and there are five different bore sizes that come up, from 53.93 to 53.97. What gives? It is a stock bore. How do I know which one to buy?
Thanks for any and all advice.
...which is nothing...
if you leave the gas cap off it only takes one
seriously, its going to be legit.
The Shop
Yes I have read your disdain for these bikes over and over again, and I get it! I bought this bike off Joel Ard, and it is a trick little scoot and the motor has been done to the 9's and it has every bell and whistle on it. While I'm sure a YZ of a similar vintage would probably have it covered, it is a ton of fun to ride and goes wherever you point it. A 125 is for the pure hell of it, and I love it.
I just want to make sure I buy the right piston for it and I understand the tolerances are close, I just don't to miss anything and there are guys on here who have a wealth of experience building these things. As I just learned through Service Honda, there are two different cylinders on these bikes within certain VIN #'s and they are marked A and B, so I have to make sure I buy the right piston for the right cylinder.
I am still open to any aftermarket opinions or do I stick with OEM?
also, i only buy OEM pistons/rings, always have and always will
Now I haven't been in a math class in quite a while but that appears to me to be .04, not .003....
And .04mm= 0.0015748 inches, not .0001
And I'm honestly not saying that even that would matter, but at minimum lets try to use the correct numbers.
The real answer is if you want to do it right measure your bore, then find out the tolerances the piston calls for, and make your choice based off of that. Or, just call the company and ask, but they might tell you to measure also. The whole point of offering different pistons is to get an ideal fit but it's your call.
Or just go with 53.94 which is the stock size...
...which means that the pistons incrementally get bigger by... .01 mm = .0003937 inches...unmeasurable by hand..
Thanks for the advice. I think I will go stock OEM at 53.94
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