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    Another Big Bore Kit thread

    I've been reading and found out that the 1971 has a 256 engine. Now the kits are for a 447 engine, won't fit mine. Unless I put in 447 rods, looks like a lot of work. Then I got to thinkin , I could change the pistons. I would need a custom made piston , a motorcycle mechanic told me he could...
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    I need advice on putting performance into my XS 650 .

    Hi: I have a 1971 XS 650 , and I want to put in a 750 Big Bore Kit. I only have one carburetor , so I'll need another one. I saw on ebay some PWK 40's should I get two or what ? Is there something else that is recommended ? I saw on the yahamaxs650.com site two Keihin PKW 32 for $250.00 , the...
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