1989 Yamaha FZ 750 KS (Europe) Logo

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Posted on Mar 19, 2011
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I have a 1987 fz yamaha 750 ran great put up for winter now wont start drain carbs and tank still wont start backfire 1 or 2 times got spark .thanks

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  • Expert 148 Answers
  • Posted on Mar 20, 2011
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Carbs have a blockage,remove and clean carbs

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I have a yamaha 1987 fz 750 ran great put up for winter but now wont start drain gas and cards put new gas in sill wont start backfire 1 or two times got spark

If old gas sat in the carb.s for more than a month it starts to dry up. As it drys up it leaves behind a varnish like film that stops up some very small ports and pin holes inside a motorcycle carburetor. It is also very hard to get out. You can try this before you pull the carb.s for a full cleaning. Use a product called Seafoam, get as much gas out of the carb.s as you can. use a turkey baster and force the seafoam into your carb.s fuel line that you took loose from the fuel tank. Let that set for days 1 or 2. then hook up the fuel tank with a mix of good gas and seafoam, (not a lot but enough to start it up. Move the cycle outside as the seafoam will make a lot of smoke if it does start up. If that does not clear up the problem you may have to pull the carb.s and remove the blows to clean the inside. If you have to do that do not DO NOT MESS with any adjustment screws, DO NoT MeSs with any screws. Just take the carb. bowls off keep each one separate and number them so they do not get mixed up. do not mix up any internal parts. It is best to work on one at the time so nothing goes wrong. Work on a large sheet so if you drop a small part you can find it, you do not want to be missing some tiny spring or screw. Hope this Helps.
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I bought a 2002 yamaha blaster rebuilt top end. New wisco piston and only bored cycl. 20 over. started up second kick. rode great about 3 hrs then parkes it. It ran great. I put 93 gas with yamalube in mix...

Try a new spark plug. Go to a motorsports dealer to purchase a new one as alot of discount or big name store can get a lower grade of sparkplug and this can create alot of grief.
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Carburetor problem wont run propley.how do i fix

Drain your carb bolws and see what you have, If it comes out with white paticles you will need to pull the carbs and clear the jets of trash.. Kit not needed unless you damage a gasket or o ring.
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I winterized my bike last winter. I drained the fuel tank on my zx 750h. ran the motor to empty lines and now i refilled the tank but it wont start. what am i missing. It fired and ran for abou 10 seconds....

try new spark plugs. and for next winter you're better off not draining everything. best thing is add some fuel stabilizer and run it a few minutes once in a while. empty lines tanks and carbs attract moisture.
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What tipe MOTOR oil use yamaha 750 FZ, 1987 YEAR

a good 10w40 oil..if you dont know what type was used before then i would flush the engine then put the new oil in
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Backfiring

Sounds like fuel is still entering one cylinder after releasing the throttle. Time to have your carbs cleaned as well as synchronized. Good Luck!!!
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