Question about 1986 Yamaha FZ 750 FM (Japan)
I have a 1983 YZ 750 yamaha. When I start it, it races about 4000 rpms. If I screw the jets all the way in, it brings the revs down. I was told that I might have a vacuum leak. If so, where should I ;look?
Hi, Stevemagney and the usual suspects are:
1. Throttle cables improperly adjusted, pinched or need lubrication.
2. Idle adjusting screw needs to be backed off.
4. Air fuel mixture adjusted too lean start with 2 full turns.
5. Intake system air leak.
6. Fast idle choke ramp is not releasing.
7. Broken throttle return spring.
8. Damaged diaphragm or slide.
9. Faulty MAP, TPS, ATS, O2, sensors or wiring/connector
10. Multi carburetors not in sync.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links blue below. Good luck and have a wonderful day.
FZ750 Super High Idle Problem
carb high idle problem
1985 1988 YAMAHA Genesis FZ750 Service Manual Repair Manuals AND Owners... $10 cheap
OEM parts for Yamaha
Posted on May 24, 2017
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Posted on Jan 02, 2017
You have a 50/50 chance that they will work okay. All the mounting holes need to line up and the cooling holes as well. Get a head gasket for the '98 and see if all lines up. Will the exhaust pipe fit the '95?
Posted on Apr 30, 2009
SOURCE: changing carb jets
the main jets just unscrew out use a socket if you can but dont over tighten when refitting.undo the 4 screws holding the carb bowl on and the jets are straight in view.
Posted on May 28, 2009
You are dealing with Suzuki vacuum carbs, you cannot just replace the air box and re-jet. What you are running into is there is no pressure to raise the diaphragm because there is no restriction to create such vacuum. Either put the stock box back on or go to the biggest main jets you can buy. Sometime even when you get stage 3 jets you still have issues. Vacuum carbs are not made to run with no restrictions.....putting aftermarket exhaust on it will make things much worse.
Posted on Sep 30, 2009
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