Please help jetting starting point
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  1. #1
    Senior Member 1986_trx's Avatar
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    Please help jetting starting point

    So I have a 86 trx bored to 67.50 Paul Turner 89 race pipe decked cylinder cool head 20cc dome ported rad valve no airbox lid runs on 50/50 110 and 90 ethonal free. I race xc and have a bored out pj 38 and don't care for it. Just bought a pj34 bored to a 36.5mm what's a good safe jetting starting point on everything?

  2. #2
    Senior Member 1986_trx's Avatar
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    I'm looking to keep it a little rich and on the same side. With my bored out 38 I don't have any low end really. This pj34 is bored to 36.5 that should be a killer woods carb right?

  3. #3
    Senior Member 1986_trx's Avatar
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    Also what thread size are the main jets and pilots in the pj34?

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  5. #4
    Senior Member american opel's Avatar
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    you should be able to use the same jetting and jets you had in your old carb. 45 165 or simaler

  6. #5
    Senior Member 1986_trx's Avatar
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    Ok I'm in the rich side or "safe side" now with my pj38 you think it would still be safe to swap over my current jetting to the pj34? Also am I wasting my time doing this? Will it be a good woods runner and be snappy?

  7. #6
    Senior Member american opel's Avatar
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    a smaller carb will give you more bottomend..reeds and pipe make a difference also.for woods i like the rad valve

  8. #7
    Senior Member 1986_trx's Avatar
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    Well the pj34 came un today and I had the quick idea to swap my 55 pilot to the 48 that came in the 34. And it made the motor feel like as soon as I shifted and hit the throttle it was there sooner. So on my pj38 I have a 48 pilot 172 main and it seems to run nice. These numbers seem good for a piped 67.50mm reeds open air box decked cylinder and so on?

  9. #8
    Senior Member 1986_trx's Avatar
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    Also its 80 degrees out. If its ripping now will it act way different at 70?

  10. #9
    Senior Member american opel's Avatar
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    most of my stock 250rs like 45-48 pilots and 155-165 mains.


 

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