Question about 1987 Yamaha FZX 750

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Yamaha 1987 FZX 750 fuel pump problem. I have new fuel pump and fuel pump relay but the pump is still not working. The pump worked for a short while but then it stopped before even all carburators were filled with gas. How is the pump working from where comes the signal to work what could be the problem....

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  • Yamaha Master
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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

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1 Answer

Fzx 750 is sputtering when throttle opened. Acceleration slow.


Hi, Jim and the usual suspects are:
1. Throttle cables misaligned or misrouted.
2. Damaged or restricted fuel tank venting system.
3. Intake system air leak.
4. Vacuum piston malfunction.
5. Pinholes or torn diaphragm.
6. Accelerator pump leaking or no output.
7. Plugged bowl vent or overflow.
8. Fuel level in bowl too low.
9. Restricted fuel supply passages.
10. Plugged jets or passages.
11. Worn or damaged needle or needle jet.
12. The enrichner valve/choke not seated or leaking.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
http://www.starbikeforums.com/forums/49-v-star/9084-v-star-acting-very-sluggish-sputtering.html
sputtering upon acceleration electrical or fuel
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Yamaha FZ FZX750 Service Manual 1986 1987 Download Manuals Technical $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Aug 04, 2017 | 1993 Yamaha FZX 750

1 Answer

How do you adjust the idle on an 82 virago 750?


Hi, Anonymous and the usual suspects are:
1. Fuel cap or fuel tank is not venting properly.
2. Fuel filter clogged.
3. Fuel line pinched or kinked.
4. Float needle and seat sticking.
5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
For more information about your issue and valuable "Free" downloads that you will need please Click on the links below. Good luck and have a nice day.
1986 Yamaha Fazer 700 KatRiders com
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Yamaha FZ FZX750 Service Manual 1986 1987 Download Manuals Technical
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Jul 06, 2014 | 1987 Yamaha FZX 750

1 Answer

Fazer owners club


You do not need to regulate the fuel, the carbs do that, the pump just supplies fuel to them.There is no fuel regulator.

Jun 30, 2014 | 1987 Yamaha FZX 750

1 Answer

1987 fzx 700 will turn over but not start. carbs are clean and adjusted. runs great when you bump start it. Fuel pump comes on even after engine is warmed up. Not sure what else to check.


chec electrical 1st its the weakest link--batt may not be at 12.6v-needed for a coil ign--corrosion/connections cud be bad like a ground-plugs-cables-ignition module may be worn---u need a fuel pressure test to confirm a bad pump--getta repair manual or library has troublshootn guides

Apr 11, 2014 | 1987 Yamaha FZX 750

1 Answer

1987 fzx will turn over but not start


Check battery charge level and connections.

Apr 11, 2014 | 1987 Yamaha FZX 750

1 Answer

Yamaha FZX 750 CDI unit wire colors


Hi, Anonymous what you need is a wiring diagram that you can find in the back of your service/owners manual if you can not find the first and best tool you ever bought for your bike, despair not, I have found one for you that costs $10 dollars. For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Yamaha FZX 750 CDI unit wire colors Google Search
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Yamaha FZ FZX750 Service Manual 1986 1987 Download Manuals Technical $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Jan 01, 2014 | 1987 Yamaha FZX 750

1 Answer

How much oil in yamaha fzx 750


Hi, Hazel230 for this scenario you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $10 you can download another one. 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.
http://yamahaforum.com/forums/fz-s-fzr-s-yzf-750/1958-oil-1986-fazer-750cc.html
https://www.louis.eu/rund-ums-motorrad/bike-datenbank/yamaha-fzx-750-fazer/2je/0563
Yamaha FZ FZX750 Service Manual 1986 1987 Download Manuals Technical
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Jul 02, 2012 | 1989 Yamaha FZX 750

1 Answer

What is the fuel pump psi on a 87 fzx 750?


Hi, Tom_sher884 that would be 2.28 psi. for this scenario, you will need your service/owners manual if you can't find the first and best tool you ever bought for your Yamaha, despair not, for a mere $10 you can download another one. 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.
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http://www.fz750.net/fz750com/engine.html
Yamaha FZ FZX750 Service Manual 1986 1987 Download Manuals Technical $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Mar 19, 2011 | 1987 Yamaha FZX 750

1 Answer

1989 Yamaha FZX 750 will not start


Hi, Burton_jake and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the enrichner.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead acid batteries.
14. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
15. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
16. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections loose, or connected to the wrong cylinders.
17. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
18. Faulty neutral, clutch lever, or kickstand safety switch.
19. Faulty fuel pump or fuse or relay.
20. A stuck bent or burnt valve.
21. Tilt sensor needs a reset.
22. Security system not disarming alarm needs a reset.
23. Check for engine trouble codes.
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.
Steps to Take When Your Motorcycle Won Start Dennis Kirk Powersports Blog
How to Start Yamaha after it been left for years in the garden
Yamaha FZ FZX750 Service Manual 1986 1987 Download Manuals Technical $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Feb 14, 2010 | 1989 Yamaha FZX 750

1 Answer

1990 Yamaha FZX 750 poor MPG


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.
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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

May 14, 2009 | 1989 Yamaha FZX 750

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