1975 XL250K K2 - Carb jetting

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chaos_mtl

New Member

• Sep 13, 2014

• #1

Hi, I'm building a 1975 XL250 K2 and I took the airbox off. I'm looking for larger jets for the stock Keihin carburetor that come on the bike. According to what I read on the net, the carburetor would be a Keihin 645b. Where could I find jets for such a carburetor? Thanks!

 

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xb33bsa

Over 1,000 Posts

• Sep 13, 2014

• #2

what makes you think you need to jet up ? what air filter are you running ? you can get keihin jets on ebay and elswhere

 

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chaos_mtl

New Member

• Sep 13, 2014

• #3

I'm guessing that because I'm putting a straight cone filter and a reverse cone pipe, I should upjet. Maybe I'm wrong, but i think I should upjet of a couple of sizes, because the flow of air will be higher, so the fuel/air mixture should be balanced.

 

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xb33bsa

Over 1,000 Posts

• Sep 13, 2014

• #4

proly so but only if you use a good sized filter a small pod will be a restriction

 

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xb33bsa

Over 1,000 Posts

• Sep 13, 2014

• #5

you can also get jet reamers and a guage for sizing