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Clutch slip,

Posted: Tue Apr 12, 2016 3:37 pm
by eamonn
Went out today and after 5 miles the clutch started to slip. Within a minute or two no drive at all. Same thing hot or cold, question does a clutch fail so quickly, and could it be something else ?, Thanks for any help

Re: Clutch slip,

Posted: Tue Apr 12, 2016 3:39 pm
by Wicky
What kind of oil are you using, fully synthetic or semi?

Re: Clutch slip,

Posted: Tue Apr 12, 2016 3:59 pm
by eamonn
Semi , 10/40. Haven't done a recent oil change ,

Re: Clutch slip,

Posted: Tue Apr 12, 2016 4:13 pm
by Wicky
Most odd as it's usually fully synthetic oil causes slip. Sounds like you'll have to delve deeper and see what's going on with the plates.

Re: Clutch slip,

Posted: Tue Apr 12, 2016 4:26 pm
by VTR Phoenix
Had the bike been sitting a while? When were the plates last changed? When was the oil last changed? Any issues with any of the gears? Have you put any sort of additive in the oil such as auto restore or similar as these are not designed for engines that share engine and clutch oil as causes the clutch to slip due to anti friction properties.

Re: Clutch slip,

Posted: Tue Apr 12, 2016 4:40 pm
by sirch345
Some good questions have already been asked.

Normally going on NO, a clutch shouldn't normally fail that quickly.

My 2p worth, have you fitted a cheap clutch lever :?:

Chris.

Re: Clutch slip,

Posted: Tue Apr 12, 2016 4:46 pm
by VTR Phoenix
Could it be a stuck push rod? What's the gear change like, if you put it in 1st slowly release clutch lever does it stall?

Re: Clutch slip,

Posted: Tue Apr 12, 2016 7:05 pm
by eamonn
Can select gear without using clutch, hear a clunk as it engages but no drive,

Re: Clutch slip,

Posted: Tue Apr 12, 2016 7:24 pm
by fabiostar
eamonn wrote:Can select gear without using clutch, hear a clunk as it engages but no drive,
so the clutch is always lifted then. id check the pushrod cause it must be holding the clutch lifted, as in as if you have the clutch lever pulled in. start there and if thats not the problem your gona have to pull the clutch cover of and see why the engine thinks the clutch lever is always pulled in.

Re: Clutch slip,

Posted: Tue Apr 12, 2016 7:31 pm
by VTR Phoenix
If you don't need clutch when its running to put in gear and it doesn't lurch forward and stall then your clutch push rod could be stuck, whip off the cover, remove the clutch push rod and check condition and also how hard it was to remove.

Assuming your clutch lever works as it should and there is fluid then if your push rod is moving freely I would then disassemble the slave cylinder and clean and rebuild.

Re: Clutch slip,

Posted: Tue Apr 12, 2016 8:00 pm
by macdee
I'm in the stuck rod camp :silent:

Re: Clutch slip,

Posted: Tue Apr 12, 2016 8:38 pm
by tony.mon
I'm going for grit in the clutch slave cylinder, preventing the cylinder from retracting.

Re: Clutch slip,

Posted: Wed Apr 13, 2016 10:51 am
by eamonn
Removed the slave cylinder this morning all looked good , no leaks , moving freely. The pushrod to the clutch moved about 8mm back and forward. Stripped the clutch out ,all looked good no wear, slipping or burning. Deglazed the metal plates with wet and dry put it back together and the clutch is back. Hurray !!! :D . Will do an oil change at the weekend just in case. Many thanks for all the help and tips guys . :D

Re: Clutch slip,

Posted: Wed Apr 13, 2016 10:55 am
by fabiostar
Happy days sir :thumbup:

Re: Clutch slip,

Posted: Wed Apr 13, 2016 2:09 pm
by Jazzscot
Nice 1. Good to hear you fixed it :D