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Thread: Throttle Body Sync on a 2002 R1150RT

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    Throttle Body Sync on a 2002 R1150RT

    Ok I have a Twin Max and I have a Clymer manual for my bike. The section in the Clymer manual on throttle body syncing says 'do not attempt' for the 2002 RT???
    Has any one done a DYI throttle body sync for this bike?

  2. #2
    Registered User roger 04 rt's Avatar
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    Quote Originally Posted by mianda View Post
    Ok I have a Twin Max and I have a Clymer manual for my bike. The section in the Clymer manual on throttle body syncing says 'do not attempt' for the 2002 RT???
    Has any one done a DYI throttle body sync for this bike?
    Follow one of the many good procedures after reading a few and it will go well. It's one of the easiest jobs you'll do.

    But don't think about trying to calibrate your TPS. It's not needed on the 1150.
    Last edited by Roger 04 RT; 09-28-2012 at 03:29 PM.

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    It's easy to do, although it took me a while to get pretty good at it. It's the last step of a trio of adjustments on the single-spark boxer to diminish the surging. Do the rocker-end gap, then adjust the valves, then adjust the TBs. There's a very good write up for the GS here: http://advwisdom.hogranch.com/Wisdom/

    You'll find all three write ups there. Also search here and read anything by Paul Glaves. Be sure to use PG's method of doing the cable TB sync at RPMs below 2000.

    Also, when you tighten the lock nuts on the cables, it will cause the TBs to go out of sync again. So hold the knurled adjustment nut while tightening the lock nut, then check the sync again. You will actually have to fudge in the adjustment so that when you tighten the lock nut the TBs will pull into sync.

    Be sure to put fans aimed at the fins and the oil cooler.

    Oh and one more thing... after adjusting the cables and restarting the engine, if it sounds terrible, like you've ruined your engine, check the throttle cable ends and make sure they are seated in the knurled adjusting nut. DAMHIK

  4. #4
    not so retired henzilla's Avatar
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    Quote Originally Posted by Roger 04 RT View Post
    But don't think about trying to calibrate your TPS. It's not needed on the 1150.
    I use the GS911 function for this and have found many 1150's not set correctly? Why not?
    Steve Henson
    SABMWRA MOA Club#62's Flat Fixer/ current forum moderator
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    Registered User roger 04 rt's Avatar
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    Quote Originally Posted by henzilla View Post
    I use the GS911 function for this and have found many 1150's not set correctly? Why not?
    Well ... I added that comment because the Motronic MA 2.4 has a learning sequence for the Idle TPS and WOT values and can therefore accommodate a range of TPS inaccuracy. Since the OP is contemplating a first throttle body sync, since there is so much information here and on other sites suggesting that TPS adjustments may be needed for 1100 Oilheads, and since the OP didn't mention a GS-911, it seemed that would not be a good thing to recommend without some evidence that there was a need to adjust the TPS.

    I find the Motronic and its sensors pretty interesting but I don't want to hijack the straightforward question about whether the TB sync can be done at home or not so I'll keep my answer brief. I accept that you've found some mis-set, I'd be curious about TPS angles the 911 reported for Idle and WOT with the mis-settings you found. Any chance you have that info?

    To your question, I guess there are a few possibilities: they came from the factory that way, there has been wear of the TB shaft or TPS sensor, or someone wanting to fix a "surging" problem followed the Lentini zero=zero advice and misadjusted them. The latter seems most likely. Was the factory locking paint intact?

    A further consideration is: "How much mis-adjustment can the Motronic MA 2.4 adapt to?" I haven't seen any data taken with GS-911 and an AFR gauge. Since I've got both instruments (WB O2 reports AFR all the time on mine) the next time I'm making Motronic or AFR measurements I might deliberately mis-set my TPS and see what happens. I suspect that setting the voltage too low will eventually throw an error code that GS-911 can pick up and also would lead to a gap around idle. Perhaps too high will cause problems for the MA 2.4 calculating fast-idle, which it does with its software. After learning the TPS range, the usual report I've seen from the Motronic is a throttle opening of 0.32 degrees and WOT is just above 80 degrees, which means that the Motronic has done its job learning the range.

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    Registered User twinsig's Avatar
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    hall of wisdom

    Ditto for HOW.

    And you MUST have decent quality high volume fan to keep it from boiling!
    Don't even try it without em....
    Democracy is two wolves and a lamb voting on what to have for lunch
    Liberty is a well-armed lamb contesting the vote

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