Grand Prix 250
Main Motorcycle: 07 Triumph Scrambler
Join Date: Sep 2012
Other Motorcycle: 07 Honda ST1300A
|Air Cooled Twins Technical Talk Technical Talk for Hinckley Triumph Twins: Bonneville, Bobber, T100, Speedmaster, America, Thruxton, and Scrambler.
Sponsored by: Triumph Twin Power Ltd
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I have been on a 450 mile road trip thinking about your issue. A constant rich/lean mix would show up on the plugs, but something killing the fuel would not. I worked on a carbureted bike that had a similar issue, at 65 mph the bike would stumble. I was able to reproduce the stumble reproduce the issue at certain RPMs, it turned out to be a piece of dirt that looked like a single flake of pepper that would lodge itself in the main jet only when X amount of fuel was being consumed.
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