Need some help here.
My bike is a stock 1997 GSXR 750 with 10,000KM.
I do have a suzuki shop manual for this bike.
It runs better cold but when it warms up, the idle sticks at about 3000rpm. When I let out the clutch to lower the rpm, they will stay down but it takes a long time to do this on its own and some times it stays right up there. Its funny too because sometimes (actually rarely)it will drop okay and idle fine (usually before it warms up)
I discovered today that mice made a home in my air filter box. Chewed through the plastic center and made a nest with the nice paper material on the wall of the filter. Also found wool and other stuff that doesnt belong in my air box. Obviously I have a new filter comming but could the absent filter wall be causing my problem. Perhaps the air is flowing too freely into the system instead of having some pressure drawing the air through the heavy paper wall of the filter?(with no wall on the filter, it would be as if the filter was not even there). The idea of an air filter is to reduce that pressure though so I dont know if having part of the filter missing could cause this problem.
Before I noticed the air filter I tried running the bike and shooting propane at the intake gasket and rubber carb mounts to see if rpm's increased indicating a leak. There was no effect.
It was sitting for about 6 years so I soaked the carbs overnight in carb cleaner and blew out all the jets, got a mint condition tank and fuel pump to replace my varnished up old one.
cant find an air idle screw on the carb and my book says "preset". Would this mean it is not adjustable? There is the slot screw idle jet on the back of the carb where the air box sits on the carb. Has a slot in the top but no spring or seal/o-ring and its short (like a jet) so thats obviously not an adjustment right?
also checked the plugs and they are the reccomended heat type (E9 or something) for that bike and are surprisingly clean (look brand new).Someones post with simular problem said to use a colder plug and that E9 is too hot. Solved his problem, wonder if that could help?
didn't change the float level nor did I check it, as well, the rubber gromets in the carb were looking kinda worn out (some minor cracking). Could that cause this problem? Its not overflowing and it runs fine when its not ideling
My vac valve fuel petcock is stuck on. Doubt it is related ...or is it? I do plan to fix but its not a top priority ...should it be? Couldnt think of a good reason of why I need to right away. Would like to get to bottom of this problem first.
Any ideas other ideas anyone?
Thanks in advance....