78 kz650

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25 Aug 2024 08:52 #903653 by choppertink
78 kz650 was created by choppertink
Got a 78 kz650. I've got issues with the starter clutches. But the few strokes I do get before the clutches stop grabbing I do perform a compression test to which most cylinders are around 60/70 psi. But I also know I'm not getting a full proper use of the starter. Any ideas or is this motor completely chalked?

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26 Aug 2024 09:59 #903690 by riturbo
Replied by riturbo on topic 78 kz650
Are you testing it with the throttle open?

Gpz 750 turbo The one I ride
Gpz 750 turbo Not finished
Gpz 750 turbo Not started
Gpz 550 1981
Gpz 550 1983
Bunch of other junk

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26 Aug 2024 09:59 - 26 Aug 2024 10:03 #903691 by Wookie58
Replied by Wookie58 on topic 78 kz650
Trying to do a compression test with a faulty starter clutch is “pointless”
as I understand it on the 650 you need to split the cases to fix the starter clutch (I may be wrong) manuals are accessible in the file base.
If the comp test was to check the health of the motor you could do a Leakage test which will identify significant issues (excessive wear etc)
PS: if this is your first post please introduce yourself 
Last edit: 26 Aug 2024 10:03 by Wookie58.

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26 Aug 2024 13:24 #903702 by Nessism
Replied by Nessism on topic 78 kz650
Fortunately, the starter clutch can be serviced with the engine in place in the frame.  It's not an easy job, though.  There are lots of older threads describing the process, and of course, also in the service manual.

 
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27 Aug 2024 10:59 #903728 by OKC_Kent
Replied by OKC_Kent on topic 78 kz650
Can you kick it over to get the compression numbers?

Oklahoma City, OK
78 KZ650 B2 82,000+ miles

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