Question about 2002 BMW F 650 Dakar

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Engine backfireing and stalling and tach meter went crazy

What is wrong, what can I do?

The engine is back fireing and stalling or running poor. Wors in rainy weather. When the problem occures the tachometer is going craizy, it goes twisting between 1k and 8k rpm, that has notting to do with the engine it self.

thanks in advance, Patrik

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  • Master
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It shows a problem with your bike's ignition components, they are probably loose and off course they get damp during rainy weather, as you might know in ignition components you have a coil which produces a very high voltage current for spark plugs to fire the engine, and also the engine rev meter is and electronic part (simply saying) what happens is the high voltage produced by ignition coil ( which is somehow loose and damp now) is being transfered to other parts (like rev meter sensor) through water (engine surface damp by rain water and this water some how gets into now loose ignition components), the high voltage received by rev meter causes those crazy jumps on rev meter, this high voltage leak then causes engine backfire or if it Hope I could explain myself but the first step and simple one you can do is check the spark plug wires see if they are not cracked and they are setting firmly and snugly on spark plugs. Have a look at it and comment if you need more advice. Best

Posted on Mar 23, 2010

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  • BMW Master
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Hi

This problem often occurs in these bikes due to either a short in the wiring harness or a problem with the ignition module. Both of these problems will give symptoms of tachometer jumping and poor running.

Given that your problem is worse in the wet - this is a strong indicator of a wire shorting made worse by damp conditions. You should check the wiring harness carefully for any evidence of a pinched wire. Pay particular attention to the wiring sitting behind the rear shock adjuster as this is a known trouble point on this bike.

Wiring issues like this can be hard to pinpoint and require a thorough inspection. If all wiring checks out as being OK - then problem is suspect with ignition module itself which will need to be changed.

Hope this helps. Please do rate my answer. Many Thanks.

Posted on Jul 27, 2009

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