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  1. #1
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    Jetting specs with tripples BB

    Ok here I go again,,,

    I have a GK 1390 BB with single pipe running VF-3s stuffers, (stock (insulator plate), advent (agressive curve).stock carbs at My jetting is 120L 140M 2.0 N/S 85 gram spring... , 155psi head. premix, F/A's
    Now I want to go Tripple pipes.
    Does any one have carb specs on Something close to mine?

    Do I need to run fuel pumps? any one got a build a BB tripple for dumby's book?
    Last edited by great lakes gpr 1200; 02-06-2009 at 08:39 PM. Reason: edited jetting to correct info.


  2. #2
    Moderator OsideBill's Avatar
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    Most of the available triple specs for carbs are aftermarket. I would start by upping the lows 10 and highs 20 then start doing acceleration and plug chop tests. Look on the bright side the carbs are easier to get to with triples

  3. #3
    Pistonwash's Avatar
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    +1 on what Bill said..you need aftermarket carbs to give that engine what it needs. I know the OEM's can feed it with very little problems, but when you get aftermarket carbs, your acceleration/top speed is blistering compared to OEM.

    Maybe someone who has triples and OEM's can help you with jetting specs..but if you can get your OEM's modded..do it.

  4. #4
    My triple pipe 1200R with 800 cylinders is fed via modified Mikuni 44's.
    The single fuel line doesn't supply enough gas so I use 2 pickups.
    160psi compression
    125 pilot, 155 main, 2.0n/s, 80 gram spring.
    With a 1390 I would go a lot fatter than this.

  5. #5

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    Quote Originally Posted by Flywheel View Post
    My triple pipe 1200R with 800 cylinders is fed via modified Mikuni 44's.
    The single fuel line doesn't supply enough gas so I use 2 pickups.
    160psi compression
    125 pilot, 155 main, 2.0n/s, 80 gram spring.
    With a 1390 I would go a lot fatter than this.

    How many hours on ur setup? What kinda octane?

  6. #6
    CHICKA WAH WAH bren's Avatar
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    triples pipes go triple lines and same amount of fuel pumps

    your climate / altitude will play a huge part in jetting with triples

    maybe time for novi 48's

  7. #7
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    Quote Originally Posted by OsideBill View Post
    Look on the bright side the carbs are easier to get to with triples
    Yes you are right bill. I had thought of that. Just adjusting the highs on all of them will be easyer, never less the lows!

  8. #8
    just GOT TO DO IT! great lakes gpr 1200's Avatar
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    Quote Originally Posted by Pistonwash View Post
    if you can get your OEM's modded..do it.
    help me with this? what mod, and where? never heard of this.

  9. #9

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    Does your GK1390 cylinders have power valves? Just curious how the tripples are gonna run without pv's ?

    Blackjack 48's are stock carbs bored and modded thats what I have on my tripple very easy to tune ...not sure if jetworks does this anymore?

    I just run a bigger single extended pickup in tank and the fuel pumps on carbs.

  10. #10

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    Quote Originally Posted by bren View Post
    maybe time for novi 48's

    Das wus up.

    Really feed that motor.

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