Question about 1989 Yamaha FZ 750 KS (Europe)

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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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Carbs have a blockage,remove and clean carbs

Posted on Mar 20, 2011

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2001 yamaha yz80 backfires and wont start


Hi, Anonymous and the usual suspects are:
1. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
2. 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.
3. Faulty main circuit breaker and or connections.
4. Faulty ignition coil and or connections.
5. Faulty spark plug, oil or gas fouled, wrong heat range or service type, wrong gap, loose in the cylinder head, broken electrode or insulator.
6. Faulty spark plug cables, leaking or broken, internal damage.
7. Faulty ignition module, switch, CKP, MAP, CMP, sensor and or any connector in the ignition circuit could have corroded, loose, or broken pins/sockets
8. Burnt exhaust valve or air leak in the exhaust system.
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.
Bike won start just backfires occasionally
01 FZ wont start after back fire FZ1OA Message Board
Yamaha YZ125N1 Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-yz-owners-manuals

Apr 12, 2014 | 2003 Yamaha YZ 125

1 Answer

Seems like carbs are flooding lots of gas and wont run right


Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition and leaking.
3. Spark plug gap too close or too wide.
4. Faulty ignition coil, module, and or sensor.
5. Battery nearly discharged.
6. 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.
7. Intermittent short circuit due to damaged wire insulation.
8. Intake air leak.
9. Water, dirt, or rust in the fuel system, fuel pump and/or filter.
10. Fuel tank vent system plugged.
11. Throttle body controls misadjusted.
12. Damaged throttle body or intake seals.
13. Loose, dirty, or corroded ignition module connector at crankcase.
14. Faulty MAP, CKP, O2, and/or CMP sensors.
15. Incorrect valve timing.
16. Weak or broken valve springs.
17. Damaged intake or exhaust valve.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have nice a day.
Hard start Backfires The FZR Forum
How to Clean Motorcycle Carburetor the RIGHT way Evan Fell Motorcycle Works
https://www.tradebit.com/filedetail.php/2864660-yamaha-fzr-600-service-repair-manual-pdf
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

Apr 08, 2012 | 1989 Yamaha FZR 600

1 Answer

Got a 750 fz only fiering on 1 cylinder ,right front sitting on bike, not getting spark to 2/3, changed coil, still not working


one coil works on the two outside cilinders and one on the two inside cilinders.So check the coils.

Jun 12, 2011 | 1987 Yamaha FZ 750 MG (Europe-US)

1 Answer

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.

Mar 19, 2011 | 1991 Yamaha FZR 600

1 Answer

How much oil do i need for a service on a 1987 yamaha genesis 750


Hi, Sergiocuevas for this scenario you will need your service/owners manual if you can't find the 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.
https://www.louis.eu/rund-ums-motorrad/bike-datenbank/yamaha-fz-750-genesis/2kk/0566
1996 FZR 600 Correct Engine Oil Drain Plug
1985 1988 YAMAHA Genesis FZ750 Service Manual Repair Manuals AND Owners... $10
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals

May 16, 2010 | 1987 Yamaha FZ 750 MG (Europe-US)

2 Answers

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.

Feb 02, 2010 | 2003 Yamaha TT-R 125 LE

2 Answers

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.

Jul 11, 2009 | 1986 Yamaha FZ 750 AE (U.S.)

1 Answer

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.

Jun 11, 2009 | 1990 kawasaki ZXR 750

1 Answer

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

Feb 26, 2009 | 1986 Yamaha FZ 750 AE (U.S.)

2 Answers

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!!!

Nov 10, 2008 | 1985 Yamaha FZ 750 FM (Japan)

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