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28-05-11, 08:45 PM
I have a zr550 which is fine when warm but when it's cold I have to rock it back and forth to free off the clutch before I can start the engine and put it in gear, otherwise it stalls.
I changed the oil a couple of weeks ago and used castrol 10/40 oil which the manual says is ok but it's car oil would that be causing the problem??
Is there a difference between car and bike engine oil??
:-/
28-05-11, 09:10 PM
Hi yea could be the problem car and bike oil have different chemical make up in them ,some which will affect the wet clutch system that your bike uses try changing the oil to proper bike oil ,you may well have to clean the clutch plates too... was clutch ok before you did oil change? have you checked adjustment etc?
29-05-11, 08:05 AM
Originally Posted by whizz1965
What he said
May be gumming the plates together, car clutches run dry OUTSIDE of the engine so the oil is different...
29-05-11, 04:48 PM
I think it was ok
I will change it thx
Not sure how to adjust the clutch except on the handle bars
29-05-11, 05:47 PM
Do the oil change mate and pop it over to me in Westbury and I'll check the clutch adjustment for ya
29-05-11, 08:04 PM
Im glad you owned up to putting car oil in, we could have been chasing that one for a while...
30-05-11, 08:31 AM
Car oil wouldn't cause that though, if anything at all. Lot's of people run car oils in their bikes to no effect, yes some have additives that 'could' cause slip, but 10/40 is still 10/40 whether bike or car oil, and wouldn't cause the plates to stick.
30-05-11, 11:43 AM
Its dependant on the grade of oil isnt it ?
And bike oils are specifically for wet clutch's arn't they :-?
30-05-11, 04:33 PM
To be exact, car oils contain large molecules ment to reduce friction on bearings, and detergents to keep surfaces clean. Motorcycle oils do not contain the larger molecules as these can affect the wet clutch and also get obliterated by the gearbox. Motorcycle oils do not also contail as much detergent.
I'd change the oil for the correct type. Don't be tempted to put synthetic oil in if the book asks for mineral or semi either... that will harm the engine seals. Then if it is still playing up it may be that the clutch needs stripping and cleaning out fully.
30-05-11, 07:29 PM
Fully synthetic can also work a little too well in its slippery lubey loveliness & cause clutch slip...
My Grandads Triumph managed to stick all its clutch plates together after being ignored for two years, needing a new clutch plate set to work again...
** When you drain the oil out to change it, take the clutch cover off & strip the pressure plate & clutch plates off & wipe them clean, dip them in some new bike oil before refitting thus ensuring they are good to go, so-to-speak
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