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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 11-12-2012, 12:55 AM   #11 (permalink)
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Haha, my conditions aren't all that cold. Today it was about 50-60 degrees F all day.
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Old 11-12-2012, 06:03 AM   #12 (permalink)
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Ok. You've probably got a vaccum leak which will also cause the decel popping you're getting.
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Old 11-12-2012, 02:13 PM   #13 (permalink)
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Found at least one area of leakage. I pulled both inlet manifolds today to take a look at the single o-ring that seals them. The left side manifold's o-ring was intact. The right side manifold's o-ring was degraded, about 1/4 of it was completely missing (must have been sucked into the engine or something!).

Anyways, so I put everything back together but I'm not going to ride until I can replace the o-rings and the rubber boots. I was thinking I could simply squirt in a bit of silicone sealant in the groove for the o-ring but I decided against it ultimately.

Thanks for all the help!
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Old 02-26-2013, 08:41 PM   #14 (permalink)
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Lucky Duck,
Did you ever fix the carb spit back issue you were having? Mine is doing the same thing and wont even run unless i have the choke all the way out. I'd be interested to know how yours turned out.
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Old 02-27-2013, 12:44 AM   #15 (permalink)
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Yes I did solve the spitback by merely turning the mixture screws out 3 turns on 40-size and 2.5 turns on 42-size. The adjustment of the mixture screws will be specific to your bike, but they really make the most difference when it comes to idle and just-of-idle performance.

I do get spitbacks (or coughs) sometimes, still, and it's usually when the engine is cold. Thus, I believe the problem is caused by an overabundance of air and too little fuel when the butterfly valve is closed to just immediately cracked open.
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Old 02-27-2013, 10:35 PM   #16 (permalink)
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Quote:
Originally Posted by luckyduck View Post
Yes I did solve the spitback by merely turning the mixture screws out 3 turns on 40-size and 2.5 turns on 42-size. The adjustment of the mixture screws will be specific to your bike, but they really make the most difference when it comes to idle and just-of-idle performance.
My bike has been running really poorly lately. Massive amounts of 'spitback' at low rpm, kept knocking the airfilters off their mounts. More than a few times i thought to myself the carbs would have to be completely overhauled, fortunately i was wrong. I found the culprit to be a clogged pilot jets. I had put off checking the pilots since I dont know of any good way to take them out without taking the carbs off of the bike, a pita in my opinion. Well not so much taking them off but I dare someone here to tell me it's easy putting the throttle cables back on, my fingers are still bleeding. Anyway, once on my bench i was able to see that the pilots were solidly blocked. A little carb spray and a very thin needle and all was good. Put it back together, fired up and runs like new. Man, the things I learn messing with this bike.
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