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Author Topic: starter clutch sprocket refinishing  (Read 392 times)

Offline doc_rot

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starter clutch sprocket refinishing
« on: Sep 06, 2018, 12:52:10 »
The starter clutch sprocket on my KZ750 is worn with ripples where the rollers engage. I cannot seem to find a replacement, unless I want to buy used cranks, fingers crossed only to find out they have the same issue. I assume the sprocket is hardened which means that the surface will have to be ground. IF i could find a place to do that for me, it would likely be prohibitively expensive. and thats a big "if" i called 12-15 shops locally to have a hardened bushing bored out not long ago and they all turned me down.
suggestions?

Offline teazer

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Re: starter clutch sprocket refinishing
« Reply #1 on: Sep 06, 2018, 20:47:47 »
What does the part look like and does it need to be ground out to a new size and if so, do you have a hardened bush to press in? Or is it the shaft that's worn and can it be ground down and then have a needle bearing sleeve pressed over the ground shaft?

Offline crazypj

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Re: starter clutch sprocket refinishing
« Reply #2 on: Sep 07, 2018, 13:55:43 »
I know the problem, CB900 has same issue. You will probably have to take a bunch of measurements and find  centre section from a different bike then cut/weld bits.  It's too long ago since I worked on KZ750 twins, but I was working at Suzuki-Yamah dealers at the time. Luckily there are not too many different diameters, you may get lucky and find a replacement from Suzuki or Yamaha, they tend to have some parts that interchange even though they 'shouldn't'.  Maybe GS1000 or 1100? You may nee a different bush running on crank though
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline doc_rot

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Re: starter clutch sprocket refinishing
« Reply #3 on: Sep 08, 2018, 05:33:00 »
These photos arent mine but they illustrate what i need. I dont think i need the machined ridges for it to work well, but i cant have the ripples.

Offline crazypj

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Re: starter clutch sprocket refinishing
« Reply #4 on: Sep 08, 2018, 22:29:11 »
That one doesn't look too bad (at least in picture?) I've had Honda ones in much worse condition that polished up well enough to keep bike running another 6 months~year while owner looked or waited for a new one (and decided not to change it until it failed again  ::) )
'you can take my word for it or argue until you find out I'm right'
Best thing I ever overheard
"yep, PJ's my boss, he taught me everything I know, just didn't teach me everything he knows"
Brian Morgan, 1982

CB360's,  http://www.dotheton.com/forum/index.php?topic=11736.0
XS650,  http://www.dotheton.com/forum/index.php?topic=11922.0

Offline doc_rot

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Re: starter clutch sprocket refinishing
« Reply #5 on: Sep 08, 2018, 23:08:02 »
Yeah mines much worse than that