Question about 1993 Suzuki GSX-R 750 WP

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1993 GSX-R 750 (Starter won't turn engine)

I have a 1993 Suzuki GSX-R 750 that is having trouble turning over. It has been in storage for a number of years and ran when I stored it. It was properly stored, and when I removed it from storage I drained the tank and put fresh fuel in it before doing anything.

I hooked it up to a fresh battery and when I tried to start it the starter motor engages, but sounds like it is straining or weak. Also the motor does not turn at all when trying to start. It appears and sounds as though the starter is encountering some sort of resistance. The battery is fresh and will start other bikes, so I know it isn't a weak battery. I took the starter off the bike to test it and when hooked to a battery it spins.

I took the tank and the exhaust off and pulled the plugs to get a better look at the cylinders because I was afraid the engine had froze while in storage. I took the little cover that covers the crankshaft bolt off on the right side of the bike so I could manually turn the engine with a torque wrench. The engine turns really easy (I could spin it with my pinky finger with the plugs out) so I know the engine isn’t frozen. However, I found it odd that I could spin it clockwise, but not counter clockwise (is this normal?). Anyway, all four cylinders moved freely and I even engaged the transmission and was able to turn that as well. I took the clutch cover off and inspected various areas of the internal components with a Q-tip looking for rust and didn’t see any. I drained the oil and found no water or rust in the oil either. I am no expert by any means, but from what I could gather everything seemed to be in great working order. Everything moved, and the oil was clean.

I want to avoid taking the bike to a shop until I can identify the problem. If its something I can fix I would rather do it myself and then take the bike to get tuned up once it is actually running. I don't want to take the bike to them in its current condition and end up spending more money on repairs than the bike is worth.

If anyone has an idea of what might be wrong I would greatly appreciate any advice someone had to offer. I think I've included all of the details in this post. I have the manual and the basic tools (no specialized tools). Thank you in advance for your help.

Posted by on

  • thomasrsierr Jun 03, 2010

    Last night I went home and pulled one plug out (keep in mind I have the tank off, so not fuel to start) and i pushed it down the driveway and popped it into gear to see if everything was spinning inside and everything was. I could hear the pistons moving and I could feel the air blowing up from the cylinder.

    I think this is a separate issue all together, but when i hook a battery up the start button doesn't do anything. The lights come on, all the blinkers and dash lights work fine, I have the kickstand up and clutch pulled in, but pushing "start" does nothing. So the starter button seems to be faulty too.

    But when I hook jumper cables directly to the starter (positive to positive terminal) and ground the negative terminal on the starter body to get the starter to engage it does not turn the motor. I put my hand over the exposed cylinder (the one i took the plug out of) and there is nothing blowing, and i can hear nothing coming from the motor. The starter sounds as if its trying really hard, but accomplishing nothing. If I leave a load on the starter (say 5 seconds) it slowly tires out and winds down as if it's dieing but the battery is fresh and fully charged.

    I do have the battery terminals hooked up correctly.

    I did put a fresh starter solenoid in it, it's brand new. I've checked all the fuses, all good.

    I may have exaggerated the "pinky" thing, but with all four plugs out I was able to spin the motor with a torque wrench with relative ease. I spun it with one hand while standing over the cylinders and could hear all four pulling and sucking air through the spark plug hole.

    It's frustrating because it went into storage running, and came out with a slew of problems that I can't seem to resolve with my limited knowledge.

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  • Suzuki Master
  • 1,508 Answers

I would suggest a compression test, but you cant get it to spin over.
Spinning it with your pinky doesnt sound right though, as the cams turning etc will cause some resistance. have you tried roll starting? is the battery in correctly red\positive?
Try a test light on the starter cable, to make sure the solenoid works

Posted on Jun 03, 2010

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