Triumph Bonneville Idle Jets

Reader Contribution by Keith Fellenstein
Published on April 3, 2012
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1978 Triumph Bonneville Idle Jets

Q: I am the original owner of a stock brown and gold 1978 Triumph Bonneville that was running great until last summer. I lost my idle. This had happened previously because of clogged idle jets. I took the bowls off and one was clogged, so I cleaned and replaced everything. The idle was better, but not perfect. I adjusted and got the idle right, but after a few minutes it would slowly die, as if it was running out of fuel. I figured I may still have some residue inside, so I put some fuel treatment in it. It started, but after two minutes while waiting for it to warm up, it lost power. It was running, but flat. Both cylinders were firing, but then it died. I have not been able to start it since, and it seems to have no spark. Fuel is present. I still have points, the original Zener diode and the rectifier. It has shown no signs of firing up since. – Bob Conrad/via email

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