Question about 1989 Yamaha FZX 750

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1990 Yamaha FZX 750 poor MPG

I own a 1990 Yamaha 750 fzx. Great allround tourer and commuter and ridden almost everyday. All the specs that I have read on this model quote them as being six speeders. Mine is only five speed and the markings on the crank support this. Wonder if it has been a variant for cafe racing or something. My fuel mileage is not that great and having a small tank calls for frequent stops. I was wondering if this could be addressed by changing sprockets to gear it up, as it has plenty of torque in top gear. If so can you recommend the sized sprockets I could try. The bike currently sits on 4500rpm at 110kph. Thanks.

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  • pisu6 May 11, 2010

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  • Yamaha Master
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Hi Kerry and the usual suspects are:
1. Excessive enrichner use.
2. High-speed riding style.
3. Idle speed improperly adjusted.
4. Dirty air cleaner element (may also affect idle speed).
5. Vacuum piston assembly malfunction.
6. Excessive accelerator pump output.
7. Plugged or restricted bowl vent.
8. Fuel level too high.
9. Loose jets.
10. Worn or damaged needle or needle jet.
11. Enrichner valves not seated or leaking.
12. Plugged air jets or passages.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
Yamaha FZX 700 FAZER MPG
ViragoTechForum com
Yamaha FZ FZX750 Service Manual 1986 1987 Download Manuals Technical $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Posted on Jun 12, 2017

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 101 Answers

SOURCE: when do i change the chain and sprockets

I found this to be some great instructions on chains and how they work and what to look for........hope this helps you out! Careful out there! Signed: fellow Rider...

http://www.canyonchasers.net/shop/generic/chain.php

Posted on Dec 14, 2008

landsend
  • 1066 Answers

SOURCE: fuel overflow from carburator

you have a stuck float in the carb.  However, the fuel valve should have stopped the fuel flow.  so you need to rebuild the carbs and replace the fuel valve.

Posted on Apr 12, 2009

co7196
  • 3433 Answers

SOURCE: Yamaha 1987 FZX 750 fuel pump problem.

Most pumps like this work on pressure drop. When the floats open the pump loses resistance pressure and resumes pumping until it feels pressure again.

Posted on May 21, 2009

  • 850 Answers

SOURCE: Yamaha Virago XV 1000 is stalling

fuel filters are in the carbs!
[very fine wire mesh] throw them away & put inline filters on the fuel lines!!!!!!
Cheers Rob

Posted on Sep 19, 2009

SOURCE: 1983 Yamaha Seca 750 no spark

Check the battery should be 12V or more , Then check the coils the connections are under the gas tank make sure they are securely connected.
What kind of fuse box do you have? The glass fuses? Or did you replace the fuse box. If it is the glass fuses you need to replace with a new fuse box.
Check the kill switch and the side stand switch.
Check the coils too..

Posted on Oct 04, 2009

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OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals
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