Question about 2003 BMW R 1100 S Boxercup Prep

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Wont start without choke

I recently bought ar 1100 s , i cleaned the carbs because there was a lot of gas comming out of the overflow. now there is no gas comming out of the overflow but now it will not idle or rev without the choke being on, when the choke is off i have to open the thottle completely in order to keep it from stalling. i think the previous owner tried to compensate for the overflow by adjusting the mixture but i am not sure

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I am having a similiar problem. bmw r 1100 s will only start with full choke and will die if I cut off choke or give it any throttle. This is my first bike and it has been sitting in a garage for 2 years. I took out the carbs, cleaned them and rebuilt them. I didn't find any residual in the carbs and they were very clean. Today, I was able to get the bike running and took it down the neighborhood but after the bike warms up it idles at 6K! Man... If I can't find any answers from this forum, I will probably drop it off at the motorcycle shop just down the hill from me. Any suggestions anyone? I think I will try to drain the fuel and give it new gas. But still....

Posted on Nov 20, 2008

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1 Answer

Clean 1992 kawasaki zx11 carb


Sounds like the bike is struggling with being too lean.
The choke richens the mixture by increasing the fuel to air ratio
Often these old carbs get worn out and allow air in without going via the air box.
However I would look over the bike and ensure all cables and things are working properly. Ensure all gaskets, gromets and surfaces are seated properly.
Lastly cleaning the carb jets will ensure there are no blockages restricting fuel flow

Jun 30, 2012 | 1992 kawasaki ZZR 1100

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I have just aquired a Moto Guzzi 1100 sport 1997 (carb model).The bike has been standing for a couple of years. I am trying to get it to fire up, having changed plugs and caps, but the choke lever seems to...


If old gas sat in the carb. for more than a month it starts to dry up. As it drys up it leaves behind a varnish like film that stops up some very small ports and pin holes inside a motorcycle carburetor. It is also very hard to get out. You can try this before you pull the carb. for a full cleaning. Use a product called Seafoam, get as much gas out of the carb.s as you can. use a turkey baster and force the seafoam into your carb. fuel line that you take loose from the fuel tank. Let that set for say 1 or 2 days. then hook up the fueltank with a mix of good gas and seafoam, (not a lot but enough to start it up. Move the cycle outside as the seafoam will make a lot of smoke if it does start up. If that does not clear up the problem you may have to pull the carb. and remove the blows to clean the inside. If you have to do that do not DO NOT MESS with any adjustment screws. Just take the carb. bowl off. Do not mix up any internal parts. It is best to work on a large sheet so if you drop a small part you can find it, you do not want to be missing some tiny spring or screw. Hope this Helps Fix Ya Up..

Sep 04, 2011 | 2000 Moto Guzzi Sport 1100 i

1 Answer

My 2007 1100 wont stay running at low speed or idle without full choke


Idle jets are pluged up take off carbs and clean jets there are two jets in each carb put back together put some sea foam in gas tank It is a cleaner Get it at auto parts store Good luck MOPAR KENNY

May 21, 2011 | Yamaha V Star Classic Motorcycles

1 Answer

Bike sits a lot,Hard to start, will only continue to run with choke on. Bike backfires alot.


You need to clean your carburetors. The ethanol that is in gasoline turns to an orange colored film
and it clogs the jets. The prevention for this seems to be seafoam added to your gasoline after your carbs are clean.
It does work. If your bike sits a lot, i would also suggest that you start it up weekly and let it warm up. Sitting is the worse thing for gasoline.
Judging from your description and other problems, the backfire is probably bad gas not burning and igniting in the cylinder when overloaded with gas.
A good carb cleaning, consists of taking the carbs off the bike, taking out all the jets and soaking everything in a good carb solution.
I would start with the carb cleaning, drain the old gas out of the tank, start with fresh 93 octane and add the recommended dose of seafoam listed on the back of the botlle to your gasoline.
Put a set of new spark plugs in it, and fire it up.
Your back fire should be gone as well.

Nov 29, 2010 | 2004 Yamaha V Star 1100 Classic

1 Answer

Motorcycle runs with choke only?


You can try a good fuel additive such as "Seafoam" . Put it in the tank. The more the better to "clean out the carbs". Start her up and let it do it's thing. Let it just idle for a while and try to open the choke. If this does not do the trick. Then you will need to remove the carbs and take them apart and clean them-sorry. When you think you are going to let her set up for 2-3 months, run some Sty-byl fuel additive in your gas. 

Oct 04, 2009 | 2001 Yamaha V Star 1100 Classic

1 Answer

1999 enfield 350cc bullet, won't tickover without full choke


Idle jet in carb may be blocked. Carb will have to be dismantled and cleaned out.

Aug 06, 2009 | 2000 Enfield Bullet 350

3 Answers

Bike has been standing for 18 months without the engine being spun. Bike will not start without choke. when choke is off engine stalls


You need to completely drain and refill the gas - the gas you have is stale and doesn't have enough power to run the bike.
The battery needs to be fully charged - not just jump started. It wouldn't hurt to do an oil and filter change as well as a air filter and plug change.

Jul 01, 2009 | 1995 Yamaha FZR 600

1 Answer

Will not run without choke


have you checked for vaccuum leaks at the intake manifold? you can check by pouring water over the gasket area when/ if you get it running!

Jun 13, 2009 | 2004 Yamaha V Star Classic

1 Answer

When trying to start the bike. Gas leaks out of


That's probably the overflow/flooding tube. Try starting it without the choke and/or with partial choke..Yea floats are stickin or needles are dirty..Good Luck..Tim

May 08, 2009 | 2002 Hyosung GV 250 Aquila

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