Ducati Monster Forum

Moto Board => Tech => Topic started by: jerryz on November 24, 2010, 08:04:10 AM

Title: New clutch drags when hot
Post by: jerryz on November 24, 2010, 08:04:10 AM
fitted a new clutch to the S4 its fine when engine cool but after half an hour it drags very badly so gear changes are a nightmare , have bled the slave silly and its new as well , adjusted the levers and pivots but nothing helps, as soon as the bike cools down all is well until it hots up again,

plates and dixcs are all in correct order ans stack is within limits so I am now not sure what to try next. also fittrd an new clutch throwout bearing .
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MONSTERMAN
Title: Re: New clutch drags when hot
Post by: Howie on November 24, 2010, 08:19:42 AM
Bleed again, and tie the clutch lever to the grip over night, you still may have some air in there.  The clutch may also just need a little break in time. 
Title: Re: New clutch drags when hot
Post by: Slide Panda on November 24, 2010, 08:23:27 AM
+1 It really sounds like there's air in there - or maybe not air but the fluid is water saturated. When that happens the water will boil out and make tiny pockets of very compressible steam. When the bike cools, the water is in it's much less compressible liquid form.

I'd bleed/flush and make sure that you have replaced all the old fluid in the system with new freshy. Make sure you drain down the reservoir as low as you can, with out sucking in air, before adding the new stuff.
Title: Re: New clutch drags when hot
Post by: jerryz on November 24, 2010, 08:29:42 AM
New fluid in the clutch slave system and i have bled it now for 3 days tied back to the bar its the first thing i did but still no good
Title: Re: New clutch drags when hot
Post by: jerryz on November 26, 2010, 12:38:35 AM
Slave cyliner was new last year and so was master ,, went for a 50 mile ride today and all seems fine now but dont know wether it was the bleeding all night again or the shims on the basket bolts that cured it or both.

clutch seems sweet now

next job check TPS as slow running a bit off
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Title: Re: New clutch drags when hot
Post by: atomic410 on November 30, 2010, 02:40:09 PM
I had a problem with mine where the adjustor screw on the lever backed in, defying gravity.  these bikes shake so can't rule out anything [bacon]
Title: Re: New clutch drags when hot
Post by: jerryz on December 01, 2010, 07:21:56 AM
Quote from: atomic410 on November 30, 2010, 02:40:09 PM
I had a problem with mine where the adjustor screw on the lever backed in, defying gravity.  these bikes shake so can't rule out anything [bacon]


yeah i checked that too tightened it and added a dab of loctite