Question about 1987 kawasaki GPZ 500 S - GPX 500 R

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Possible clutch problem. Feels like setting off in 3rd gear.

My Daelim scooter has lost acceleration from a standing start and strugles at low speed up hills. Once moving above 30 kph it still performs very well and there is no loss of maximum speed. The only way I can describe the difference in performance is thta it is like setting off or traveling at low speeds in 3rd gear. I have removed the belt drive cover and observed that the front drive pulley closes half way before the clutch on the rear pulley starts to engage.
I have no experience of variable belt drives and I would welcome any advice as to when the clutch should engage along with any other comments you could make.
Many thanks

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Replace your big clutch spring!!!!!!!! a 1000rpm spring. If the spring isn't stiff enough your scooter lose alot of its torque! and the spring loses its stiffness after some time.. that is normal The spring has the same effect as changing back a gear on a motorcycle. try it! I guarentee it.

Posted on Apr 07, 2009

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If it has a 4 stroke engine then check the compression. You may have bad valves. If it's a two stroke engine the exhaust port(s) may be plugged a bit with carbon buildup. Clean air filter? Exhaust pipe allowing clear exit of exhaust presure?

Posted on Mar 11, 2009

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If you say the scooter struggles at low speed up hills you need to determine if the cluth is spinning

Put the scooter in front of a brick wall or something that will not move

open accelerator and see if engine races ad scooter does not gerk or try to climb wall
If this is the case you have a clutch prolem

you will need to replace clutch

Posted on Jan 05, 2009

  • Steve Archer Jan 05, 2009

    It sounds like the variable elt drive is not engaging properly

    the belt works on th principal of providing pressure and thus engages there has to be some form of tension either springs or in this case pulley pressure

    I think you should remove the belt and clean any oil off of the pulleys to increase friction


    as the belt wears it can bcome streatched etc replace the belt and like i said before you could have a bad clutch


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Check this pinout HERE
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Verify TRANSMISSION ISS and TRANSMISSION OSS read correctly on Scan tool.
Make sure the pressure control, shift 2, shift 3 and shift 4 solenoids are not intermittently sticking. A sticking shift solenoid 4 may cause 4th gear to be applied from an initial start resulting in no 3rd gear. Audible sound should be similar for all solenoids. A muffled tone indicates the need for replacement.
Check this pinout HERE
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