I recently brought a classic 1980 kawasaki z550a and in a moment of foolishness i filled it with octane 99. Once the bike is warm the rev's stay high up after the throttle has been released only decending back to idle after a few minutes. They can be forced down by breaking in gear. The push and pull throttle cables are all returning back to their original positions on top of the carbs so i know they aint sticking. I've now ran the tank to reserve and filled with octane 95 but the problem continues. whats wrong???
2007-07-17 08:05:03 · 7 answers · asked by Anonymous in Cars & Transportation ➔ Motorcycles
sell it
2007-07-17 14:07:48 · answer #1 · answered by Nightrain 3 · 0⤊ 0⤋
The fuel grade is a red herring. My guess would be stuck linkages, or gummed up carbs.
Check the linkages first - it's easier. Remove the air filter so that you can see down the carbs. Cables can stick inside, sliders can stick too. Operate the throttle, look inside the carbs and make sure everything moves and returns okay. You could also check that the needles are free on the sliders, and not sticking. It's an old bike....
I've not used this stuff, but it may be worth a look at carb cleaner - it's nearly 30 years old.
If the engine is revving high it must be getting the mixture to rev high - carb/cable set up is where I'd look first. don't mess with anything unless you keep a clear note of the settings and how much you alter them by.
2007-07-17 15:30:25 · answer #2 · answered by philipscown 6 · 1⤊ 0⤋
The cables may be returning but that does not guarantee that the carb slides are returning. Just because it happened after you put that fuel in may not necessarily mean that the fuel was the cause, something else may have failed coincidentally. One of the carburettor diaphragms may be playing up. A lump of dirt may have been dislodged making the bike run rich. It may therefore be worth giving the carbs a quick service. In the past I had a Kawasaki GPX250 (what an awful bike) and had a problem where the fuel tap was internally stuck on reserve and that allowed loads of detritus to pass into the carburettors as the reserve had no filter.
2007-07-17 15:32:20 · answer #3 · answered by ? 3 · 2⤊ 0⤋
Check for air leaks around the intake manifolds.
Sometimes the plugs sealing the sync tubes, crack and loosen creating an air leak.
Also the tubes themselves break free of the manifolds.
When the bike is reving, turn on the choke.
If there is a leak, the added fuel from the choke circuit will balance the fuel/air mixture and lower the RPMs.
Spray all around the intake manifolds with wd-40 when the bike is reving.
It will clog any leaks and lower the RPMs.
2007-07-17 15:46:52 · answer #4 · answered by guardrailjim 7 · 2⤊ 0⤋
It is NOT the fuel! ~
Look for the problem elsewhere.
2007-07-17 15:08:48 · answer #5 · answered by Anonymous · 2⤊ 0⤋
AS WITH THE AIR INLET THEORY IT COULD BE LOSE SPARK PLUGS AS WELL
2007-07-17 16:15:38 · answer #6 · answered by Anonymous · 0⤊ 1⤋
try disconecting the batary for ten minutes then reconect then run engine again.
2007-07-17 15:11:57 · answer #7 · answered by tugboat 4 · 0⤊ 4⤋