What carb jet?
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Thread: What carb jet?

  1. #1
    Junior Member bkvanbek's Avatar
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    What carb jet?

    I bought my 250r new in 1986 and have changed little. New reeds, and different jet for WY years ago. I just got it running again, I think I have the WY jet in there. What should I have for MN and WI, 750-1000 ft? I would like to run 32:1 fuel to oil too.

  2. #2
    Senior Member american opel's Avatar
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    42-45 155-165

  3. #3
    Junior Member bkvanbek's Avatar
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    Quote Originally Posted by american opel View Post
    42-45 155-165
    Can you dumb it down, what do the numbers mean? Where can I get a whole set? I have a Keihin carb.

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  5. #4
    Senior Member 2ndmoto's Avatar
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    He was telling you pilot jet of 42 or 45. Main jet of 155, 158, 160 or 165. Keihin offers a few models of carbs and their pilot jets can be different from model type to model type. Mains however, are often times compatible from one keihin model to another.

    Sudco or jets-r-us are good suppliers. Start out rich and tune down. Tune in your pilot and then the main.

  6. #5
    Junior Member bkvanbek's Avatar
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    Quote Originally Posted by 2ndmoto View Post
    He was telling you pilot jet of 42 or 45. Main jet of 155, 158, 160 or 165. Keihin offers a few models of carbs and their pilot jets can be different from model type to model type. Mains however, are often times compatible from one keihin model to another.

    Sudco or jets-r-us are good suppliers. Start out rich and tune down. Tune in your pilot and then the main.
    How do I tell what model carb I have?

  7. #6
    Senior Member american opel's Avatar
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    all keihin carbs use the same jets.and you need to pull yours.check them and than go from there.

  8. #7
    Senior Member 2ndmoto's Avatar
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    Easy way to tell the model is the shape of the slide
    Pwk has a D shaped slide
    PJ has and oval
    PE has a round slide
    Pwm has a extended d shape to it

    Pwk and pj are most popular keihins on a 250r. Pj, pwk, pwm all share the same main and pilots. Pe uses same main but has a different pilot


 

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