Question about 1990 Yamaha FZR 600

3 Answers

Bike wont start

Starter is kicking over, engine is trying to fire up but just backfiring. checked leads and plugs all look to be in working order. fuel pump is working fuel is getting to carbs and they seem to be working fine. i'm wondering where to look next?

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  • Xjac0bmichae Feb 25, 2009

    I stored my bike for about 4 months and didn't put any stabilizer in the tank. It was in a covered parking ramp away from the elements. Now it won't start. Can't be anything electrical. Not getting any gas. What do I do?

  • Anonymous Mar 14, 2014

    carbs cleaned, fuel pump checked and 100% fuel petcock checked and 100%, fuel in tank, ignition system works as had it running from jumper cables, battery is dead.

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My '89 FZR sometimes starts fine and sometimes doesn't. When it does not, i noticed that the number one cylinder does not fire (thru exhaust headers #1 being cold). What could be the problem here? I've checked all the leads & the plugs.

Posted on Aug 18, 2011

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I just helped my buddie work on his bike with the same problem an i have to pull off the coils an clean all the ends were it grounds an put it all back to gether an make sure the plug wires are all getting good conection on the plugs an it fired rite up after him messing with it for 2 weaks

Posted on Apr 20, 2009

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Hi,

Initially, pls check/verify:

  • left ignition coil goes to #1 & #4 plugs while right ign coil supplies 2 & 3;
  • presence of spark on each and all of the plugs;
  • temporarily remove the air cleaner/filter box/assembly and cover each crb opening with the palm of your hand while cranking. presence of gas would be noted with fuel on your palm;
  • engine flooded. remove, clean, dry/replace plugs.
Incidentally, if no spark on plugs, check connectors to CDI, or starting with the clutch lever pulled.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information. Good luck and kind regards. Thank you for using FixYa.

Posted on Nov 13, 2008

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1200sporty


Hi

It would appear that you have two (2) issues:
1. wont even crank - Due to the massive current required by the starter a component is installed between the starter button and the starter. This component then switches the battery to the starter motor. In cars this is the starting solenoid, in most bikes, this is the starter relay. Normally in the starter relay there would be 2 big terminals for the battery and the starter motor cables with 2 smaller wires for the starter switch and ground. Try this - try pushing the start button with the headlights on, if the headlight dims considerably, then the starting relay is good and the motor is bad; on the other hand if the headlight dims just slightly or not at all, it is the starting relay (the one with the clicking sound). I was made to understand that there was a recall order due to starter relay and/or 30 amps breakers.
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2. carbon brushes;
3. commutator segments (the multiple small copper plates that the brush contacts with).
However, it may be to your advantage to simply replace the motor should it be deemed defective, difficult to secure parts or not economically reasonable to go down component level repair.
2. backfires dies under load - There are 2 major requirement for a gasoline engine to run, fuel and ignition. Backfiring is normally indicative of poor fuel to air mixture (most likely) and/or slightly off ignition firing (just a possibility). Areas to check are you air filter, carbs, plugs, intake manifold, seals/locks.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

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