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Author Topic: Clutch plates sticking when engine cold  (Read 731 times)

Offline Moa

  • Posts: 257
Clutch plates sticking when engine cold
« on: Oct 11, 2012, 22:37:14 »
Ever since I bought it my 1973 CB125S usually clunks into first gear after the bike has been sitting for a while. I figured that the clutch plates are sticking together. The bike only needs to sit for a couple of hours before the plates stick. I've decided I should try remedy this problem before I wear out first gear. Not sure if the type of oil has anything to do with it. for the last oil change I used full synthetic 5W-30 oil, the manual calls for 10W-30, but I couldn't find any in 1 litre bottles.

Anyone out there have any idea how I could fix this problem?

Offline SONIC.

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Clutch plates sticking when engine cold
« Reply #1 on: Oct 11, 2012, 22:59:21 »
What kind of oil?
It has to be motorcycle specific designed for a wet clutch system. Car oil won't cut it and will cause what you describe.

Offline Moa

  • Posts: 257
Re: Clutch plates sticking when engine cold
« Reply #2 on: Oct 12, 2012, 00:40:18 »
Thanks for the advice, I'm just using Mobil brand oil from the petrol station. I'll do an oil change with motorcycle oil, and see if that fixes it. Is it OK to use 10W-40, as this this a much easier type to find?

Offline Autotek

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Re: Clutch plates sticking when engine cold
« Reply #3 on: Oct 12, 2012, 00:45:49 »
Use motorcycle oil. Newer oils are too good and can cause a slipping clutch as well as sticking discs. Mean while, use a zip tie to hold the clutch lever in while it is parked and it will be free when you ride it.
« Last Edit: Oct 12, 2012, 00:48:15 by Autotek »

Offline SONIC.

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Clutch plates sticking when engine cold
« Reply #4 on: Oct 12, 2012, 00:57:37 »
Any auto parts store (autozone, advanced, oreilley, napa, etc) should have some 10w30 motorcycle oil

Offline Getnjgywitit

  • Posts: 73
  • Four bikes and counting!
Re: Clutch plates sticking when engine cold
« Reply #5 on: Oct 12, 2012, 01:05:42 »
Thanks for the advice, I'm just using Mobil brand oil from the petrol station. I'll do an oil change with motorcycle oil, and see if that fixes it. Is it OK to use 10W-40, as this this a much easier type to find?

They make motorcycle oil for a reason.  It has friction modifiers that allow the clutch not to stick after sitting parked for a while and it also keeps the clutch from slipping while in use.  Using normal car oil can cause damage to your clutch resulting in premature clutch wear or even worse, broken parts.
"Sleep late, have fun, get wild, drink whiskey, and drive fast on empty streets with nothing in mind except falling in love and not getting arrested." ~ Hunter S. Thompson

1976 Kawi KH500 Cafe
1980 Yami SR500 Street Tracker
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1967 Wards Riverside 125 (In Need of Restoration)