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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Posted on Jan 02, 2017

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Triumph bonneville america starts but wont rev


Hi, Rex and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking check for spark leakage in the dark.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
7. Intermittent short circuit due to damaged wire insulation.
8. Intake air leak.
9. Water, dirt, or rust in the fuel system, fuel pump and/or filter.
10. Old dead or bad fuel.
11. Faulty fuel pressure regulator
12. Pinholes in the in tank plastic convoluted tubing from the pressure regulator to the quick disconnect check valve.
13. Fuel tank vent system plugged.
14. Throttle body controls misadjusted.
15. Damaged throttle body or intake seals.
16. Loose, dirty, or corroded ignition module connector at crankcase.
17. Faulty MAP, CKP, O2, and/or CMP sensors.
18. Incorrect valve timing.
19. Weak or broken valve springs.
20. Damaged intake or exhaust valve.
21. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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Triumph Bonneville Ignition Control Unit CDI Limiter Failure
Triumph Bonneville 2001 2007 Workshop Service Repair Manual Download...
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Can i fuell inject my 2001 triumph bonneville


yes, but it would be several thousand dollars with all of the parts and labor. these require feedback from sensors, a high pressure fuel pump, a different wiring harness, and plenty of other parts that are very expensive.

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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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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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