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Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, T100, Speedmaster, America, Thruxton, and Scrambler.

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Old 12-08-2012, 12:52 AM   #1 (permalink)
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Popping decel related to TPS position

I am starting a new thread because I have narrowed down the problem I am having. Take a look at my signature to see what my mods are.

Here was my problem: I love my new tune by TTP (Tune #2) -- much more power, no jerking etc -- but I was experiencing popping on decel (something I did not experience prior to removing the AI, and simply using a marble in the hose as a temporary solution).

Mike has been helping me a lot via email. I checked and sealed my Arrow exhaust for leaks, but still got popping. I also dicked around with the idle speed, and still popping. I adjusted the TPS from .65 down to .62 in TuneECU and the popping on decel got worse.

So, I tried adjusting the TPS up to .66 and yes, the popping stopped! The exhaust smells a bit richer now, but no popping whatsoever.

Of course, there is another problem now. With the TPS set at .66, the choke knob (which has two settings, medium and all the way out) is a bit sketchy. Moving the knob in and out seems to give me different RPMs every time time I move it.

I am going to let the bike cool down now, keep the TPS at .66 and see what happens after one more adaptation reset cycle. I will let you know what happens.
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Current: 2012 Scrambler, Bitubo forks, YSS shocks, Arrow 2-to-1, 33mm DB killer, TTP tune #4, Breathe, DNA filter; O2, AI, Airbox baffle, EVAP removed, Up-N-Over, Pivot Pegs, Ventura rack.

Past: '83 Honda XR500; '84 Honda XL600; '86 Yamaha XT350

Last edited by tvscum; 12-08-2012 at 01:11 AM. Reason: corrected numerous typos
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Old 12-08-2012, 04:05 AM   #2 (permalink)
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With the TPS increased the ECU will 'think' you have the throttle opened a bit and so will not run on its idle settings, possibly won't adapt and will fuel a little higher (rich) due to the imagined larger throttle opening.
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Old 12-08-2012, 05:06 AM   #3 (permalink)
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Look for a air intake leak round the throttle bodies.(Rubber Boots?) The slight adjustment you have made to the TPS should not upset the ECU.
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Old 12-08-2012, 10:21 AM   #4 (permalink)
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Quote:
Originally Posted by huggy39 View Post
Look for a air intake leak round the throttle bodies.(Rubber Boots?) The slight adjustment you have made to the TPS should not upset the ECU.
OK, I will check that out too. However, I have never taken the throttle bodies apart and this bike is one year old. Thanks! I will update later.
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Current: 2012 Scrambler, Bitubo forks, YSS shocks, Arrow 2-to-1, 33mm DB killer, TTP tune #4, Breathe, DNA filter; O2, AI, Airbox baffle, EVAP removed, Up-N-Over, Pivot Pegs, Ventura rack.

Past: '83 Honda XR500; '84 Honda XL600; '86 Yamaha XT350
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Old 12-08-2012, 07:20 PM   #5 (permalink)
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Just tried an updated map from Mike. Still popping on decel.

Bottom line... it pops with the TPS set at .60.

It does not pop with the TPS set at .70, but smells a bit rich at this setting. I have not checked the plugs.

Still working on it.

EDIT: Just got some minor popping, even at .70. So, I am going to take my Arrow 2-1 exhaust apart again and try sealing it with Wurth Exhaust Paste, just to make sure. I'll update this in a few days.
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Current: 2012 Scrambler, Bitubo forks, YSS shocks, Arrow 2-to-1, 33mm DB killer, TTP tune #4, Breathe, DNA filter; O2, AI, Airbox baffle, EVAP removed, Up-N-Over, Pivot Pegs, Ventura rack.

Past: '83 Honda XR500; '84 Honda XL600; '86 Yamaha XT350

Last edited by tvscum; 12-09-2012 at 02:58 AM.
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