Question about 1991 Yamaha FZR 600

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My 1991 yamaha fzr 600 wont start

Last year i had a bad ground, i fried my cdi box, and only had spark on 2 wires. yesterday i got that cdi box, and now i have spark on all 4 but it still wont run, i changed staterz, coils, changed my oil and filter. its getting gas cause i can smell it. i put gas down the carbs, still wont run.

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  • j69bigdaddy Mar 14, 2009

    i have the same problem with mine and i am starting to lean towards my timing being off, i hope this might help you as well

  • Randy Hough
    Randy Hough May 11, 2010

    Have you done a compression test?

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How long did you let it sit for with gas in the carbs, you may have clogged up your jets. after awile gas will break down and turn into varnish, if your bike trys to push the varnish through the system it will clog the jets. try to take off your seat then remove your plastic over the gas tank. remove the gas tank and you will see four bowls *silver ones right next to where the gas tank is on the carbs*. your bowls are in sets of two. there are drain screws on the bowls to remove the gas inside. remove the 16 screws holding the bowl onto the carb. *4 on each* inside you will see your floats and jets. carefully loosen the jets with a screw driver then finish unscrewing them by hand, they are brass and very soft. you should be able to hold up the jets to the light and see a small pin hole. if not get some carb cleaner and give them a squirt and blow them out. do not try to use anything to clean them out, they are very very sensitive and one knick will change the jet. after that i would spray some carb cleaner up the jet holes and try to clean them out also. if you have a compressor it would be wise to use that to blow out the gunk from the jet holes as well. after you run threw all 8 jets put them back together and see how it goes, if nothing you may have to check the jets again and if clogged again your carbs are gunked up and will need to be cleaned

Posted on Aug 12, 2009

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I have 1992 yamaha fzr 600 was running perfect but now it wont fire


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, 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.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Faulty fuel pump fuse or relay.
11. Security alarm needs a reset.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
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Jan 05, 2013 | 1991 Yamaha FZR 600

1 Answer

I have 91 fzr600 will start ok if it is warm but if it is cold i have got to crank it over for ten min. it is like it warms up turning it over after it starts i can turn it off and it will start and run...


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, 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.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Faulty fuel pump fuse or relay.
11. Security alarm needs a reset.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
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https://www.tradebit.com/filedetail.php/2864660-yamaha-fzr-600-service-repair-manual-pdf
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Hi, Si and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, you need 12.5 volts or better and be able to pass a load test if necessary, 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.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Faulty fuel pump fuse or relay.
11. Security alarm needs a reset.
For more information about your issue and valuable "FREE" downloads that you will need please visit the websites below. Good luck and have a nice day.
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2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
6. Faulty ignition coil or ignition / electronic module
7. Failed CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Security alarm failing to disarm needs reset
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What would cause my 1991 yamaha fzr 600 to idle at 3500? Could it be the cdi box?


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Feb 22, 2012 | 1991 Yamaha FZR 600

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I have a 92 LTD Vance&Heines FZR 600, (part# TID 14-73 3 H E-00) the cdi burned up and I was told that from 89 to 99 cdi would fit. So I bought 1 off a 95 FZR on EBAY (part# BB7233 3UU-10). The...


Hi, Rtistree you need a wiring diagram sorry 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 visit the websites below. Good luck and have a nice day.
https://www.tradebit.com/filedetail.php/2864660-yamaha-fzr-600-service-repair-manual-pdf
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Jul 03, 2011 | Yamaha FZR 600 Motorcycles

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96 fzr killer spark pulls fueletc.... ok i left one thing out doing a compression test today BUT what started this it was running great and shut off because the gas tank rubbed through the three stator...


well when it grounded out it probably fried a fuse or the relay my fzr had a bad stator that ended up killing the relay listen when you start it to hear if it clicks twice if it does you have a bad relay

Jun 11, 2010 | 1991 Yamaha FZR 600

1 Answer

94 fzr 600. no spark to cyl 2 and 3 i swapped the wires to from 1 and 4 see if it was the coil and the 2 and 3 sparked fine further ive tried to wire directly from the cdi to the coil with my own wires...


Hi, James8026 and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. 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.
4. Loose connection at ignition coil or plug between ignition sensor and module.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
6. Faulty ignition coil or ignition / electronic module
7. Faulty CKP, CMP, or BAS sensor.
8. Faulty ignition switch.
9. Security alarm failing to disarm needs reset
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.
http://mybikemanuals.com/yamaha/yamaha-fz-owners-manuals
OEM parts for Yamaha
https://www.tradebit.com/filedetail.php/2864660-yamaha-fzr-600-service-repair-manual-pdf
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1 Answer

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Capacitor Discharge Ignition modules control the spark timing to the engine based on the inputs received from various sensors. There will be no spark if the CDI is bad

Mar 10, 2009 | 1991 Yamaha FZR 600

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