Question about 2000 Triumph Trophy 900

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Motorbikes backfires, and is irratic with accelration.

My Yamaha 600 Diversion K reg twin exhausts keeps backfiring. I have just brought the bike and the 1st day it was running fine with pillions on the back. Today when going to work (fair bit of stop-starting) It started to backfire. Before it backfires it tends to be slow to accelerate. I can overcome this by over rev-ing the bike when I get the biting point when changing gears, but obviously this is not the best option.

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Nice bike and an annoying issue. Backfire is unburnt fuel that then detonates.

Hopefully, it's just a plug going bad. Pull the plugs and see which one is black/wet. That will be the tell tale sign which cylinder is acting up.

I'd replace all, set the proper gap and install them and take it for a test drive.

Good luck hope this is a simple fix.

Posted on Oct 05, 2009

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is it a straight thru exhaust, or is it just a head pipe with nothing attached? If it's just a head pipe, you need to get some sort of muffler on it or you'll burn your valves out from a lean condition. The backfire is due to the vaccum fed carbs that yamaha runs. They work wonderfully, but under heavy deceleration, the vaccum still feeds the bowl, and it builds up excess fuel, which eventually burns off as a backfire. If it were fuel injected, you could have the fuel map adjusted to lean it out under deceleration.

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3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
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6. Faulty spark plug cables, leaking or broken, internal damage.
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8. Burnt exhaust valve or air leak in the exhaust system.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Backfiring and seems to be struggling getting fuel


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3 Answers

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carbs need stripping and cleaning then balancing. this should sort it.

Feb 16, 2009 | 2000 Triumph Trophy 900

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