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| *Vultures Knob>>>Road Bike |
Motorcycle carb. dilemma? |
I recently bought a 1982 Honda CS250 four-stroke road bike. The bike starts good and runs good except.... when in a higher gear (3-5) and you let off the throttle to coast, and then open the throttle up again, it has a real bad hesitation. If you leave it 3/4 choked, it eliminates the problem. That would lead me to believe that it is running way to lean and choking it richens the mixture and makes it run better, but I searched for a mixture adjustment screw and cant find one.... the only adjustment screw i could find on the carb is up by the intake manifold and it faces downward. I turned it in (to the right) about a turn and a half and it helped a little bit, but im assuming that screw is like any other carb adjustment screw and turning it in would make it leaner.. so it doesnt make sense. Does anyone have any ideas? Also what does that screw adjust? Also sometimes when i start it, it make almost a whistling sound that i think is coming from the exhaust? Is this related? You should have bought a drum set. You're wasting your talents you know. Wasting. Hi I'M NOT sure about your exact carb but . here is some things that I have found on others including honda's: some have an ajustment screw that will stop your jet/throttle valve from going all the way closed. at the same time they may have an ajustment at the top of the throttle valve slide that looks like the cable adjuster on your brake. if you can get your hands on a haynes manual for your bike it may help. hope this helps. You could have a blocked exhaust system. With a bike as old as yours, the internal parts of the muffler can rust and come loose blocking flow. The symptoms are that the bike will start and idle nicely because the exhaust flow is little and isn't affected by the restriction. At high load and high rpm the engine misses since the higher exhaust output can't escape. You can test this theory by removing the muffler or even the entire exhaust pipe and going on a short ride. http://faq.ninja250.org/wiki/how_do_i_wo... everything you need to know about 4stroke carbs. not the fastest way to get your answer, but it is the fastest way not to forget. http://www.ninja250.com I think your right about it running lean, I think it may be your pulling in air some where between carb and engine. I would carefully check rubber mounts for cracks and splits and make sure any retaining clips/springs etc are fitted properly. If you think the carb is to lean, try raising the needle (on the throttle slide) one position - move the clip down. The screw you're talking about is the mixture screw. But it only affects the idle mixture - after 1/4 turn of the throttle, it has no effect. Whistling is usually from air rushing past an opening. Check for cracks in the exhaust, loose muffler joint (I don't know if your model has pipes that separate), or leaking header pipe (exhaust to cylinder head). |
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