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  1. #1
    commander's Avatar
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    Triple Pipe Timing Help

    2001 GP1200R
    Currently:
    125 pilots
    145 mains with #3 147.5
    1.5 N/S
    95g spring 43 psi popoff
    Maxima 927 32:1 premix 93 octane
    Advent Yam-46, maybe reprogrammed, waiting on Greg at Adventignitions
    Factory Triples
    Protec rec head 41cc
    Riva gas valves
    Prok flame arrestors
    cylinders ported and polished
    stock carbs and reeds
    boost bottle
    RIVA reed stuffers and spacer plate
    acc. pump blocked

    Just adding the advent cdi
    I wanted to know if running the advent will have enough retard timing in the #3 cylinder that keeping the larger jet in #3 carb will be unnecessary.

    Also, need suggestions for jetting? Currently very rich on low end. Bogs at takeoff. 110 pilots? gold spring?
    Thanks


  2. #2
    commander's Avatar
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    ttt

  3. #3
    on a 1200
    Advent with Yam 44 curve
    110 Pilots
    140 Mains
    1.5 n/s
    95 gram spring.

    I used this at sea leval 150 psi head 93 octane and stock manifold NO BOOST BOTTLE. I would ditch it and move on tho the v-force III cages instead

  4. #4
    Duke's Avatar
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    Boost bottle can play havoc on jetting, most have done away with it. Looks like you might have to rich of a pilot.

    Advent doesn't list the 46 curve so its impossible to tell if it is suitable for your app. Call Greg and get him to email you the curve chart and then post it.

  5. #5
    commander's Avatar
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    Unhappy

    Do away with the boost bottle? Ok, I will try that.
    Going with 110 pilots then. Thanks
    Advent has 44,45,46 curves. All are the same until 6500 rpm. 45 curve has less advance after 6500 rpms than 44 curve. 46 has more advance in cylinder #3 after 6500 rpms than 44 curve.

    V-force III cages. Will I need a different spacer plate? 3/8" right? Got any idea how much these run?

  6. #6
    GPR114's Avatar
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    Are you sure it isn't a lean bog? Is it falling on it's nose or stumbling? With the Novi's & a Dominator that would be too much pop off. We run 140 / 160 with a 2.5 n/s and 115 spring. I don't know if stock carbs need that much pop off.

  7. #7

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    Its a hard one to tune over the net as all boats are different. I would say its probably a lean stumble due to your pop-off being to high. You want to be around 21 psi on the pop-off. on a triple. Your jetting seems to be on the money. A 125-130 is a good number on the low speed jet . I wouldn't go smaller on the pilots as those stock carbs have a dangerous lean midrange.
    Check the hidden things that make a rich feel if It is rich? ,like leaky needle valves. At this time change to a 2.0 n&s with a 80g spring that i'll put your pop-off right

  8. #8
    commander's Avatar
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    I was running the gold springs, and the 95g has alot more takeoff. Before this change I wondered where the "arm ripping" takeoff was that everyone talked about.

    The bog is a stumbling after a long no wake. It takes 5-10 seconds to clear out and I fog for mosquitoes through the no wake.

  9. #9
    Duke's Avatar
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    Not really comparing apples to apples here but when I had the Novi 48s on my single I had to run 2.3 needle and seat with 80 gram spring to get the boat to launch with no lean cough. With the stock carbs on the same exact boat with no other mods I had to run 1.5 needle and seat with a 95 gram spring. I tried a 2.0 and the boat would gurgle and load up. I am sure this has to due with signal strength but not really sure how to test it.

    I realize this is not addressing the timing question but may help understand the pop off issue.

    Curve #44 doesn't look that bad. Do yo have a printout of #45 because I can't find it on thier website?

  10. #10
    commander's Avatar
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    Curves all the same to 6250 RPM and from 8000 RPM up.
    YAM-44
    Curve Cyl Cyl Cyl
    pt #1 #2 #3 RPM
    20 17.0 19.4 12.0 6500
    21 17.0 16.8 10.0 6750
    22 15.2 14.2 09.0 7000
    23 13.0 13.0 13.0 7250
    24 14.0 14.0 14.0 7500
    25 14.0 14.0 14.0 7750
    26 10.0 09.0 08.0 8000
    Rest of curve points are same as 26

    YAM-45
    20 16.0 18.0 12.0 6500
    21 15.0 15.0 10.0 6750
    22 14.0 13.0 09.0 7000
    23 13.0 13.0 13.0 7250
    24 13.0 13.0 13.0 7500
    25 13.0 13.0 13.0 7750
    26 10.0 09.0 08.0 8000
    Rest of curve points are same as 26

    YAM-46
    20 16.0 18.0 12.0 6500
    21 15.0 15.0 10.0 6750
    22 14.0 13.0 10.0 7000
    23 13.0 13.0 13.0 7250
    24 14.0 14.0 14.0 7500
    25 14.0 14.0 14.0 7750
    26 10.0 09.0 08.0 8000
    Rest of curve points are same as 26

    I remember reading that the 1.5 n/s will flow more than enough for the stock carbs. Also having a smaller hole will help prevent dribbling from the vibrations from the triple pipes.

    Last of snow gone today. Will be 50 degrees this week so hopefully I can get to the river for some tuning if there aren't any icebergs. Going to Norris Lake, TN in May and need to be sure everything is running good. Thanks everyone for the help.

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