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    To overbore, or not to overbore? that is the question

    I pulled apart the blaster a couple weeks ago and saw that it has had a couple overbores. Right now the piston size is 67.25 and there is definitely blow-by on the exhaust side. My concern is that the piston skirt is too thin towards the bottom as is, let alone to rebore to 68. any thoughts?
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    safe overbore?

    i just pulled the blaster apart and saw that the overbore is 67.25mm. or at least i think so. The last 4 numbers on top of the piston were 6725 so that was my guess. correct me if i'm wrong! If not, would it be fine to go to a 68mm? or does any have any other suggestions. I'm porting the jug...
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    Throttle valve size

    correct me if i am wrong, but the throttle valve size determines how big of a bore i can do on my carb. the problem is... i have no idea the size of the stock throttle valve as my carb is together right now and it is really wore out anyway. Anybody know?
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