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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 11-11-2012, 12:07 PM   #1 (permalink)
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Main Motorcycle: 2007 Bonneville T-100
Join Date: Jun 2010
Location: Atlanta GA U.S.A.
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Other Motorcycle: 79 Bonneville "GONE"
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Idle Speed /Choke Question

I have a question/concern with my 07 T-100 carb Bonneville. I purchased it this summer when morning temps were usually 70 or higher.

Full choke at cold start-up was around 1800-2000 RPM. Idle after choke release 1000- 1100 RPM.

Now morning temps are in the 40s. Engaging full choke has no effect on engine RPM. idle is about 1000 RPM. With full choke I adjusted the idle speed to 2000 RPM. After a few seconds the engine idle speed shoots up to 3000RPM.

I have re adjusted the idle speed with the engine hot back down to 1000 RPM. The bike runs great as it has all summer. But this reoccurring cold idle/choke issue is sort of a PIA when first starting.

Any of you carb owners experiencing similar cold start issues? Fixes?
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Old 11-11-2012, 12:31 PM   #2 (permalink)
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Main Motorcycle: Suzuki GSF 1250S Bandit
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Location: Lincoln UK
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You could try checking the carb heaters in case a wire's become disconnected.
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