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Whats the diff between 38mm and 39mm pwk??
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Posted by: MX450

NOT an A/S, but just a 38mm and 39mm pwk, what is the difference between the two??

The keihin website shows specs, the measurements are the same, the only difference it shows is the jets, is this the only difference?

I currenty have a 38mm pwk, and i need a new carb, should i go with a 39mm?

Posted by: Aceman

The difference is 1mm.

Look at the measurements on Keihins site again. They show outside, not inside measurements.

Posted by: wilkin250r

The inside of the carburetor at the slide is the "size" of the carb. The outside numbers can be identical.

Me, personally, I feel a 38 is pretty big on a 265, I don't think I would suggest bigger unless you're a big dune rider or something that requires lots of top-end and have no use for low-end at all.