Bike had trouble starting the other day. Then a few days later it gave trouble while trying to start it again. Finally got it started, ran great. Then the next time I tried to start it, it fired right up. And again it started great, then I was riding it up a hill and it started bocking and sputtering, until it finally died and wouldn't go up the hill. I turned it around and jump started it going down the hill. Ran good all the way down the hill and then once the road was flat it ran good still (I even red lined it just to make sure it would hammer all the way through the power band). I got it home and again it wouldn't start. I was thinking maybe the fuel pump was bad. I pulled it apart and the fuel pump works great, bowls are getting plenty of gas. Could it be the spark plugs? Battery? What Else????
My guess would be you had water in the fuel. going up the hill put the water in the floatbowls right in the pickups for the carbs and going down pulled the water away.
SOURCE: 79 yamaha XS 750 crank no start
well here goes your problem probably in the float bowl area water sediment blocked low speed jets if you do not want to do a complete tearmore down just clean the jets and float bowl.
Use a carb cleaner soak the jets make sure you can see through them the small low speed jets specially.
if you have access to air blow the jets clean.
spray any passage ways with carb cleaner reassemble good luck.
SOURCE: Canadian bike 1991 Yamaha fj1200,50,000kms.
Chances are there is a water build up in the carb float bowls. The water comes from condensation in the gas tank. Try draining the carbs. Another possibility is carburetor main jets partially plugged up. You must clean the carbs if plugged jets are found to be the problem. Please rate my answer. Thanks.
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An update: I replaced plugs and checked all lines, I actually think it might be the battery. I pulled the battery, trickle charged it and the bike fired up and ran great. I took the bike in the garage and repeatedly turned the bike on and off, it worked great but then on about the tenth try it wouldn't start, I then got the bike started and it was doing the sputtering thing. Then it finally died out again and wouldn't start, the battery was dead. I am going to run some tests on it tomorrow, if this is not the problem, how do I go about cleaning the jets on the carbs (there is four of them) and how do I make sure there is no condensation. I know how to get down all the way to the carbs, via pulling the tank and airbox, but then I am unsure of what to do at that point. Thanks for all of the help.
Ok it wasn't the battery. It was that the carbs needed to be cleaned. I put in some fuel treatment with jet cleaner in it and after I ran a tank of that through the bike is running great. Thanks everyone for the help!
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