Question about 2003 BMW R 1200 CL

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Cl 1200 I am experiencing backfiring from my exhaust once the engine is warmed, the running is also very lumpy and the bike occasionally cuts out. Fuel economy is reduced and the bike generally has no power under throttle but plenty of back firing. Could this be the regulator/rectifier?

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Reset valves and throttle bodies

Posted on Oct 07, 2014

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SOURCE: 1989 k100 bike will start

hi , check the following : 1 - old fuel or water in fuel ? 2- Drain the carbies 3- timing is out and need adjusting 4- Remove bowl from the carbies and give the jets a clean . try all this and let me know how you go .

Posted on Jan 05, 2011

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1 Answer

Engine starts,but lumpy and if you open throttle cuts out


run fault codes and look for temp sensors --MAP/MAF sensor faults

Nov 18, 2013 | 2006 Volkswagen Golf

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My 1990 Harley sportster 1200 is backfiring and won't idle without backfiring can you help?


Hi Anonymous, popping, coughing, spitting, or backfiring through the carburator or induction module is usually caused by air getting sucked in combustion chamber do bad intake seals leaking. Leaking exhaust gaskets can also be suspect. Remove air cleaner and backing plate, while engine is idling spray WD-40 or Brake Kleen around intake manifold to head area, if RPM's increase you have an intake leak and seals need to be replaced, also spark plugs will be burning whiter than normal. Good luck

Jan 05, 2012 | Harley Davidson XL 883 Sportster...

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I have rattle problem with my BMW R1200 Montauk motorcycle. It sounds fine on starting from cold but once engine gets hot a rattle develops. Williams BMW Manchester have suggested it could be exhaust...


I have seen a few of the R1200C bikes with this rattle.... There is a cat. converter in the exhaust system and it sits between the pipes approx. under the transmission. This is the usual cause of the rattle.

Warm the bike up by riding it around for a while, then stop the engine and use a plastic face or rubber hammer to tap on the exhaust system in the area near the transmission to see if you can hear a rattle or something loose in the exhaust. This should give you some idea where the source of the rattle is.

There is no easy fix for this problem except replacement of the offending parts.

Sep 22, 2010 | 2004 BMW R 1200 CL

1 Answer

Air cutoff valve, what does it fo?


The air cut valve shuts off fuel to the carburetors during deceleration so the bike does not sputter and backfire.It saves fuel, noise,and damage to the exhaust.

Jun 26, 2010 | 1986 Honda GL 1200 Interstate Gold Wing

1 Answer

Had a 1200 upgrade, new exhaust valves, guides seals, have a stage 1 arlen ness filter, 2 1/2 " 45 calaber drags, had a 45 slow jet, the shop put in a 170 main jet, ran fine for a while then the plugs...


I would say that something has changed since you had the work done. You said that it ran good and got 54 mpg (you said "mph" but I think you meant MPG") after the work was done. Now, it's backfireing, sputtering, and getting 37 mpg with dry black deposits on the plugs. Something has changed.

Considering that you didn't mention anything you changed, the only thing that has changed is the weather, it has turned cold. Cold air is more dense than hot air therefore, your carb should be running leaner, not richer. But, I'd be willing to bet that you're allowing your bike to run longer with the enricher on when warming it up before a ride. Am I right?

The enricher circuit is a very rich mixture. It's rich enough that if you allow your engine to run too long with the enricher on, it will foul your plugs. Fouled plugs are indicated by a black sooty deposit on them. In my experience, once a Sportster fouls a plug, it will not clean itself like a Big Twin will. Why this is I have no idea but that's my experience. You'll either have to replace the plugs or get them cleaned somewhere. I clean them in a glass beading machine but you have to blow them out very well before reinstalling them. I also put a little anti-seize on the threads to keep from damaging the spark plug hole threads.

Try installing a new set of plugs and when you start your bike, only run the enricher long enough to warm the bike to the point where you can keep it running with the throttle lock knob to bring the engine to operating temperature. That enricher is a plug killer.

The only other thing I can figure is that the main jet has come loose and fallen out, trash in the needle and seat, a vacuum leak on the front head at the intake manifold, the VOES, or petcock. If it ran good in warm weather with the 170 main, it should run good or may a tad lean in cold weather.

Dec 29, 2009 | 2005 Harley Davidson XL 1200 C Sportster...

2 Answers

Backfiring, flames coming out of exhaust and cutting out


Sounds to be a timing problem or burnt exhaust valve.. A compression test will tell the story.

Jun 02, 2009 | 2000 Suzuki VL 250 Intruder LC

2 Answers

Bike stalls in high gears when cruising around 45-50MPH


Could be your spark plugs, or maybe your side stand as some bikes if not all of them now have a switch on the side stand which prevents the rider from starting the bike if the stand is extended. So if the spring which retracts the stand is slightly lose, it pulls on the switch and cuts off power. Im not an expert but just check these.

Could also be that your carbs are dirty. So just give them a bit of a service and check for any blockages in there.

Mar 27, 2009 | 1996 Suzuki LS 650 Savage

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