My RS has about 1400 miles on it now. Love the bike!! But every now and then when I shut it off during a ride, I'll get back on it, turn on the key and it will dump gas(it comes out at the bottom of the air box). It doesn't happen all that often, mostly when it is hot, but sometimes not. Anyone had this problem? Any answers? I've gotten better at turning the petcock off, seems not to do it then, but when you stop for 5 minutes or so I usually don't think about it..

Thebru, my 2000 RS has done it on three or four occasions, but like you said, it's been really hot out. Usually what I'll do is let the bike idle a bit with the petcock off then kill the motor. It seems that the fuel in the bowl expands on extremely hot days and overflows, that is what you see on your garage floor, usually a dribble's worth. Anyways, you might want to check that the fuel level in the bowl is at the correct height and not over the spec.. Hope this helps, Big Al.

Thanks Big Al. Basically that is what I have been doing. Turn the fuel off before the engine, giving the gas a little expansion room. I also leave it off till after I start the engine. I also wondered if the altitude had anything to do with it. At a mile high, should any of the factory settings be changed.

What year is your bike? 04-05? Have you made any mods to the bike or are you still stock? I've added quite a few things to mine and living here in Cheyenne(mile high)my bike runs great. If you have any aftermarket goodies, then your carb would require jetting and so on. Post what you've done and I'm sure Doc, Gram, someone or myself will try to help.

I've ridden in some fairly hot weather this year and have never observed this occurring. I don't think it's 'normal' and we should not have to accommodate it by turning off the petcock.

Dave had the same problem and this is what I suggested to him:

"As for the 'puking' carb .... I've seen a few posts re this problem. Occurs mostly when the engine is hot and the gas 'boils off'. It's quite possible that you have some dirt in the carb bowl which has worked it way into the float bowl needle seat and jams it. Take the bowl off, the needle out and clean out the passages with compressed air. Once you put it together also check out the float level. I believe for the '05 it should be .2 mm above the mating surface."

Doc

It's an 05' with no mods, except I removed the AIS. The bike runs great, just this little quirk every now and then. I don't have a service manual yet. Found one online but it was for the 1600. Know where I can look it up for now?

The carb on the 1600 is the same as on your bike, BSR40 Mikuni with a larger main jet. You can do a search here for any info on the carb or I can e-mail you a pic of the carb if you'd like.

Paul Milner has the service manual 04 supplement on his website:

http://paulmilner.promweb.de/handbuch.htm

Doc

Check out --> Hellriser Customs


thebru wrote:
It's an 05' with no mods, except I removed the AIS. The bike runs great, just this little quirk every now and then. I don't have a service manual yet. Found one online but it was for the 1600. Know where I can look it up for now?

Mine just started doing this yesterday. Wasn't a problem until I installed aftermarket parts, but I only had 300mi on it at that point so it may not mean anything.

Fuel shoots out the top atmosphere vent hose when starting the bike after sitting for awhile (hot). At first I thought it was coming out the breather, but then realize the vent hose was aimed at the back of the breather. What a mess this makes, not to mention making me feel like I need to run for the nearest fire extinguisher! I'm pulling the carb off today to check the float/needle and lower the float level slightly for good measure. Since I live in Central Florida I'm disconnecting the carb heater too.

Have yet to install the ported manifold I received before Christmas and remove the AIS, so hopefully once I get the carb fully dialed in this won't be a regular occurance?

If this is a percolation problem, why doesn't it do it when the bike is sitting? Seems that starting it causes this so wouldn't that be the added pressure from the fuel pump + a float level/needle problem instead? Why doesn't it come out the float bowl overflow instead of the atmosphere vent? Is there a float bowl overflow?<br><br>Post edited by: sjh55, at: 2007/01/07 08:04