Question about 2008 Triumph Triumph Bonneville

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Sudden loss of power

I am in Australia and have a 2001 Triumph Bonneville, when I have ridden it for about 40 kms and usually when I am on a freeway and riding at about 110kms per hour consistently it suddenly loses all power from both cylinders. I coast to the kerb and within 30 seconds to 1 minute it restarts and rides fine for about 1 km then it happens again. It only does it when hot, not when just riding in the suburbs between 60 and 80 kms per hour. Mechanic has replaced take up coil but problem still the same

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  • Dick
    Dick May 11, 2010

    I would be checking the fuel and air filters. Sounds like the engine is being starved for one or the other. If you put it in first gear and accelerate slowly up to near redline does the motor act up at all? Because if you have air or fuel restriction somewhere you should have some symptoms when the motor is working harder, as it would when turning a lot of rpm.

  • Anonymous Mar 22, 2014

    Triumph America goes well until sudden loss of power in R.H.S. cylinder. Can be struggling for 10 minutes or two hours. As I need to have a lot of throttle to keep going, it can be dangerous if the power kicks back in. Power goes off and on as if a switch has been turned on or off. Where is cdi unit and are there one or two on the bike. Any help appreciated.



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I have the same problem, I talked to the Triumph dealer and he said it was the gas tank purge valve. It's between the carbs connected to the frame, it's hooked up to the gas tank vent pipe on the bottom of the tank. He said there was two issues and that this one was 9.5 out of 10 the solution. He said to just remove the purge vale and put a straight piece of plastic in place of it. The other solution which is more exspensive he said was the crank trigger sensor.

Posted on Jan 29, 2009


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Hi, Rex and the usual suspects are:
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Where is the access to the air filter element on a 2001 Triumph Bonneville?

under the left side cover you'll find three screws holding it in.

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How often should i oil the drive chain and clean it ? When must it be replaced?

Use commercially available chain lubricant to keep the drive chain from ever running dry. Usually it will be necessary to lube the chain every 200 to 500 miles, depending on how hard your bike is ridden and the conditions it is operated under. Chain lubes available at your local motorcycle shop are far superior to using any other type of lubricant. They are formulated to not fly off and make a mess of your rear wheel, clothing, etc.

If given decent care, you can expect your drive chain to last 10,000 to 20,000 miles. Lubrication and proper adjustment are the keys to success. Ordinary cleaning is not necessary - except for off road bikes.

It is time to replace the chain when you can lift the chain from the sprocket and expose anything more than about 1/2 the length of any tooth on the sprocket.

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