Need help on carbed Bonnie! - Page 2 - Triumph Forum: Triumph Rat Motorcycle Forums
Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, Bobber, T100, Speedmaster, America, Thruxton, and Scrambler. Sponsored by: triumphtwinpower.com

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post #11 of 42 (permalink) Old 07-16-2018, 04:35 PM Thread Starter
Minitwins
Main Motorcycle: Bonneville T100 2005
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Thanx for this advice! I'm still trying to find any air leakage but don't understand how to do in better. Checking all the cables and tubes don't give a result. But seems that the problem should be somewhere here
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post #12 of 42 (permalink) Old 07-16-2018, 05:00 PM
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Was the bike not being used for a long time before the problem started?

Last edited by rweb; 07-16-2018 at 05:03 PM.
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post #13 of 42 (permalink) Old 07-17-2018, 03:34 AM Thread Starter
Minitwins
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Bike stays for a half a year in garage, but after that is starts and goes normally for about 200 kilometers, then CDI unit died and I've change it to Triumph Twin Power and at the same time problem appears
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post #14 of 42 (permalink) Old 07-17-2018, 10:41 AM
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I'm still thinking pilot circuit problem, needs cleaning again, air leak or bad needle and seat (leaking) as @steventhechef suggested. Usually plug wires, coils will show up more under load or at hi RPM than at idle. All ignition parts, except igniter can be tested with an ohm meter.
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post #15 of 42 (permalink) Old 07-18-2018, 07:07 PM
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My 2006 is having a very similar problem. Sputters under 2K and one sided popping on decel. Also thought it was a fuel problem, but it wasn't. Waiting for a new Nology coil to arrive now. As already said... likely your ignition coil causing the misfire.
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post #16 of 42 (permalink) Old 07-19-2018, 03:49 AM Thread Starter
Minitwins
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Thanks for info'! I for now this problem is not solved? How do you understand that it's about coil?
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post #17 of 42 (permalink) Old 07-19-2018, 05:42 PM
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In my case it's just process of elimination. I eliminated the carbs, same as you have. OEM coils are common to break down and mine is 12 yrs/38K miles used. Still waiting for my new coil, but will let you know tomorrow if it fixed my misfire or not.
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post #18 of 42 (permalink) Old 07-19-2018, 06:05 PM
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For suspected problems, oversimplified rule of thumb: running rough on both cylinders = fuel / vacuum
one cylinder not firing = coils / wires
shuts off all at once and re-fires again and goes dead again = ignitor

coil can give a good reading and not fire when under load ignitors will faill intermittently before going completely dead sometimes.

19t, BC Sleepers, 42 pilots, Thrux needles & springs, 135 mains, K&N, Dart screen, air box bafflectomy, Barnett greens, TEC shocks
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post #19 of 42 (permalink) Old 07-20-2018, 09:25 PM
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New coil did NOT correct my problem.
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post #20 of 42 (permalink) Old 07-21-2018, 02:05 PM
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Quote:
Originally Posted by Pingwinst View Post
Thanks for info'! I for now this problem is not solved? How do you understand that it's about coil?
Because it's misfiring on one cylinder, then turning back on - like kid playing with light switch.

If carb / air leak, then it would be constant problem
If Ignition pick-up or ignition computer it would be both cylinders cutting out or randomly switching from side to side

The ignition coil may test OK cold, but when it gets hot, problems show up.
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