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  1. #1
    305coco's Avatar
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    gpr no low end torque

    need help from the carb experts, 02 12r 140psi r & d heads and just put in carls vf3's and rejetted to 125 mains 110 pilots 1.5 n/s 95g spring from carl, adjusted pop-off at 42-43 psi turned out lows 1 turn out and highs 1 1/2 out, idle is at 1400-rpm -----------now heres the problem it idles perfect but if you accelerate it wide open it boggs out real bad for like 2 seconds like bbbbwwwoooooaaaaaarrrrrrr and then goes, if you accelerate slowly it goes fine, mid range and top is crisp very responsive i thought i was lean on the lows so i opened the lows to 1 1/2 but it didnt help could it be to rich/ lean or can the pop-off be to low/ high. plz help dont want this one to be the second one i sieze


  2. #2
    I'm no expert but the lows are very sensitive to adjustment. Going out 1/2 on the lows was like going from Earth to the moon. You may of went from too lean to too rich? I would try 1 1/4 and see how it is.

  3. #3

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    You would need to have your choke plates in to try this......

    Close your choke 1/4 on your 1st run

    Close your choke 1/2 on your 2nd run

    Close your choke 3/4 on your 3rd run

    Once it gets into the high speed circut, (higher rpms) close off the choke. If it runs better on any run, then you are starved for fuel on the bottom.

    Without choke plates, try tapeing about 1/3 of each flame arrestor with duct tape. This will temporarily increase your vacume. If your bottom end comes alive, then you are starved for fuel on the bottom.

    If this works, open your bottoms 2 turns out. If this is still not enough fuel on the bottom, you may have to rejet to 115's.

    I had to do this to mine. In fact, I had to lower my pop off pressure as well. It worked out fine.

    All of these test are designed to temporarily get more fuel to the bottom end,

    If you get any positive information, then thank Fernando.... he gave me these tips.

  4. #4
    305coco's Avatar
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    ill try to come up with something cause i dont have chokeplates or flame arresters

  5. #5
    quadzilla's Avatar
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    Question ???????????

    Hey Coco...

    Quick question... did you have your powervalve cables off at any time..??

    This sounds like what i had/did recently..
    I'd put the damn cables on in reverse.....!!!!!

    So before you start on making choke plates outta tape check the cables..

    Gerry,..

  6. #6
    Value one MB VIP's Avatar
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    I Have The Same Problem!!!! I Thought It Was The 14/20 Prop I Have On It.

  7. #7
    GPRPITMAN's Avatar
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    Like I said before george you sound rich to me 1/8 turn at a time

  8. #8
    Moderator OsideBill's Avatar
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    No F/A's at all? or are you running the stock air box? The carbs need some restriction to help with signal.

  9. #9
    spud's Avatar
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    Thats the same jetting I ran on my 1200 including turns out on the screws. What flame arrestors do you have? How did you seal the VF-3's up? I would be suspicious of an air leak.

    You need gaskets on both sides of the VF-3's with sealer. I cut gaskets and use 3Bond 1211 smeared thin on the gasket surfaces.

  10. #10
    305coco's Avatar
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    Quote Originally Posted by quadzilla View Post
    Hey Coco...

    Quick question... did you have your powervalve cables off at any time..??

    This sounds like what i had/did recently..
    I'd put the damn cables on in reverse.....!!!!!

    So before you start on making choke plates outta tape check the cables..

    Gerry,..
    i never touched the p/v's gerry, and i read your thread about the reversed p/v's cables and dats the identical problem im having i didnt know how to put the noise it made when you stab it in writting untill i read your bbbbbbwwwwwooooaaaaarrrrrrrrrr if you accelerate normal its fine the problem its only when you stab it wot, im running no f/a's at all, never have either so i dont think its an air leak and i sealed the vf3's with both gaskets dat came with the reeds and a real thin bead of black rtv gasket maker on both sides of both gaskets

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