QuestionHello,
I bought a 92 Cbr 600 about two weeks ago and I am having some problems. When Im cruising along on flat ground or downhill, anywhere that I have the throttle in one spot, the bike starts to sputter/surge, and continues to sputter when I roll on the throttle, but I open it up and it seems to go away for a bit. At times the bike has actually died after the sputter. It almost seems as if it is running out of gas, but there is plenty. The bike idles fine, and this does not happen at any particular rpm range, and it doesnt happen right away either, it usually starts about 1/2 hr to 45 min into a ride. The few times it has died on me when this happened, I pulled off, made sure I had enough gas and it started right back up and I took off, however the problem was still there (the sputtering). My gas cap is slightly damaged, don't know if that could cause this. Also, upon inspection I noticed a valve off the back end of my petcock that isn't hooked up to anything. Maybe this is a venting problem? Would that cuase constant problems, or would it build up like I have described? The previous owner claimed to have had major maintnence done 5k ago. It has been sugegsted that I have my valves adjust and carbs cleaned/synced, but I can't help but think that it is something else since it does not orrur constantly... Well, thanks in advance for any suggestions you might have.
AnswerHi Scott,
There should be two hoses connected to the petcock: a larger fuel hose and a smaller vacuum hose. If the vacuum hose is not connected, the manifold which the other end is connected is sucking air and causing a lean condition. This would cause improper engine running and may be the source of the problem you've described. If the smaller hose is connected to the "South" petcock port, put it back onto the proper West port, so to speak.
Cut and paste the following link. Visit the website and look at part #20. Thais is the vacuum hose.
http://houseofmotorcycles.bikebandit.com/partsbandit/oem_schematic_view.asp?sche...
Keep me advised. My email is: mshively1@woh.rr.com
Respectfully,
Mark Shviely
