Question about 2004 BMW R 1100 S

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COLD MORNING The bike is a r 1100 s . The ONLY time I have problems with the bike running is on mornings when the temp is below 65F. After letting it sit running (anywhere between 2 minutes to 15 minutes), I start out ok and then either the bike dies at a stop and won't restart unless the bike is in neutral, kick stand up and clutch in, or it starts loosing power as I ride down the road. If it looses it when I am moving, it will sometimes go from 4-5k RPM down to zero, then back up and down causing the bike to buck. This will usually go on for the first 3-4 miles of the trip, and then will work fine. I have had it happen the whole 7 miles into work though. For the initial start and warm-up, I have used the choke to start and then turned the choke off and let it idle (per the dealer's instructions), I have left the choke on so the RPM's stay between 2-3k (done for various amounts of time up to 10 minutes). I have tried riding with the choke partially on hoping to prevent it from dying at stops. Now for the kicker. I can let the bike sit from Friday after work to Sunday afternoon, and if it is warm out, it starts right up and is ready to ride with no more than a minute or two of warming up. I suspect I just need to take it to the dealer and leave it with him overnight, but I wanted to get opinions from others on the site before I do so. What might be causing the problems, and any ideas on solutions? I've had carberated cars many times before, and some were a little temperamental on cold mornings, but nothing like this

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No doubt this bike is running very lean at idle. Thats the way the EPA wants it. Im a harley mechanic and i used to work in a US dealer. all carb bikes at set up time had the carbs "readjusted". We drilled out the EPA plug and turned the idle air screw out and drilled out the pilot jet too. The bikes worked much better. we were at sea level too so the bikes were very lean from the factory. I can imagine that after the new legislation that came into force they are even leaner and require a full warm up to run properly. Warmed up means you put your hand on the motors head and its hot enought to have to jerk it away. this could take more than a couple minutes. and yes our "readjustment" was illegal. i advice you to do the same.

Posted on Nov 20, 2008

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