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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 06-08-2011, 03:04 PM   #1 (permalink)
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How Do I stop The Exhaust Popping

I have read many many post about the popping in the exhausts when decelerating.
I have richened the idle mixture up with the D tool, even to unscrewing the mixture screws eventually to 6.5 turns just on a try to see what happens basis....but still it pops probably as bad as before.
I have removed the AI. That did stop the popping when blipping the throttle when stationary but didn't stop in on road use.
I have fitted TOR's and the 120 main jet that came with them and standard idle jets.
Is it a characteristic of my Bonnie T100 or can it be stopped because its driving me mad ?

Last edited by turbo; 06-09-2011 at 08:33 AM. Reason: Edited main jet size from 125 to 120
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Old 06-08-2011, 03:12 PM   #2 (permalink)
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It can usually be traced to a weak idle mix, but seeing that you've tried all that, the only thing left is to locate any air leaks within the exhaust system.

Check the tightness of the pipe flanges at the head, and look out for tell-tale signs of soot indicating the gaskets are not sealing well.

Go on to the pipe-silencer joint. Is it distorted, clamp loose or not sealed with some silicone sealer?. It should be. Once again look out for soot traces or even run your hand close to the joint to feel for gas blowing out.

Also, did you use sealing washers on the AI blanking plugs?. Are they tight?.
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Old 06-08-2011, 03:28 PM   #3 (permalink)
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Mine pops all the time on deceleration. It's a feature.
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Old 06-08-2011, 03:30 PM   #4 (permalink)
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Thanks for your comments Forchetto
I have done so many thing to stop the popping I have forgotten some I have done, sorry, need to add these.
I have removed the TOR's recently and resealed the pipe to silencer, fully tightened the clamps and have no distortion, I have checked the head flange's and all are air tight, I have just checked the tightness of the AI plugs and they are nice and tight with new copper washers 3 weeks ago.
I have run the engine at about 1500 rpm and placed both hands over the silencer end, no hint of any leaks and the engine eventually stalled leaving quite a high back pressure until I removed my hands.
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Old 06-08-2011, 03:38 PM   #5 (permalink)
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Errr...It's a feature! as Black Dog says...

Can't think of anything else. It's a long shot but check the spark plugs are tight. I've checked mine a few weeks ago and was a little shocked to find them almost finger tight. I did install them to the makers instructions on torque but they came loose.

I don't know if that can cause it, but you never know.
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Old 06-08-2011, 05:50 PM   #6 (permalink)
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I think it's an electrical problem if you wear your iPod, and turn up the volume I bet the problem goes away
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Old 06-08-2011, 05:56 PM   #7 (permalink)
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It's gonna pop.
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Old 06-08-2011, 10:46 PM   #8 (permalink)
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Funny, I moved recently from a T100 to a Sprint ST, and one of the endearing features of the 1050 triple is the burbling/popping of the exhaust on over run/ deceleration. Would hate for that unique sound to go away. Just saying....My T100 didn't pop even w the AI intact, after changing exhaust and remapping, arrow 2into 2 map...tomp

Last edited by tomp; 06-08-2011 at 10:56 PM. Reason: addition
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Old 06-09-2011, 06:03 AM   #9 (permalink)
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I know the dynamics of exhaust gas flow are complex, and I am no expert, but the Bonnie has always popped on the over-run. To some extent it is a feature of open exhausts. Always had TORs, and the popping was the same before and after airbox gutting and bigger jets. But my XT exhaust rusted through at the header and became porous, and (I assume) was letting air in close to the exhaust valve. The sound that made was quite different from a burbling and popping - it was more like proper bangs like a backfire when I shut the throttle. I associate that kind of sound with an air leak - the gentle popping of the Bonnie is just a cool sound.
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Old 06-09-2011, 06:47 AM   #10 (permalink)
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125 jets are surely too big with TORS and no other modifications.
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