Question about 1990 kawasaki GPX 750 R

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Starting problems Kawasaki (Engine Type) ZX750FE041703

This engine is in a off road go kart I recently purchased, and I have no experience with 4 stroke motorcycle engines. Believe the doner bike was a early 90's GPX750 - Cam timing chain in center of block.

Problem is that when attempting to start, the engine turns over but about every 10 seconds of cranking there is a loud backfire, nice flame from exhaust and no ignition.

After pulling the alternator off, found that the belt was split, could this create the symptoms above?

Spoke to a local mechanic and he seemed to think the problem was ignition timing, perhaps a sheared keyway - cant seem to locate a manual to assist and the couple of Kawasaki dealers in my area say the motor is to old for them to assist.

Any pointers would be a great help.

Posted by on

  • Piranha69 Jun 02, 2009

    Thanks capiemael, lots more info than I started with.


  • Piranha69 Jun 02, 2009

    Link to following parts manual is a great help what would be a great help from here is a manual. From what I can see the Belt, Generator, part number 59011-1052 could definitely effect ignition timing, just not sure where to start looking, apart from replacing belt and hoping.

    Does anyone know of a system diagram that can be used, even if off a similar motor design?

    Appears to go

    Starter Motor, Generator Shaft, Generator and crank

    From Generator probably the ignitor, coils, spark plugs (timing system)

    From Crank to pistons, fuel delivery system.

    Questions then are now that I have moved the generator shaft (testing for binding etc), removed the starter motor, if I replace the belt is everything going to be out of whack - if yes what timing marks am I looking for to align to (TDC type setting) or are they irrelevant on these types of motors. Cant see a Computer anywhere, just the ignitor.



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