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wet clutch


johnney

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I was told by a mechanic at Motorcycle Doctor to use an oil fill extender tube which allows you to fill the crankcase to the very top , adding almost an additional 1/2 qt. of oil He said that this will cure wet clutch issues . I've been doing that for years and never had an issue. I was concerned that doing this would build up too much crankcase pressure but not so.

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Wow!.. That  seems counter to everything I know about engines....   The piston creates pressure in crankcase as it travel downward .. if theres no airspace , to absorb it, the pressure plus the expansion of oil that is hot,  should force oil thru the rings and into combustion, fouling plugs . ...and with higher level of oil, the crankshaft is submerged and begins whipping the oil into a foamy mess.. foam does not lubricate .. thus bearing damage occurs .. plus the pressure causes oil leaks to start.      maybe you are just at the critical level ?  Dont know, but I fill mine to high side of mark with dipstick not screwed in ... never had a clutch fail in a dozen ATV, UTV over 40 years ... and NEVER use full synthetic oil for cars in them... only wet clutch oil 

Edited by Joe Breaux
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1 hour ago, Joe Breaux said:

Wow!.. That  seems counter to everything I know about engines....   The piston creates pressure in crankcase as it travel downward .. if theres no airspace , to absorb it, the pressure plus the expansion of oil that is hot,  should force oil thru the rings and into combustion, fouling plugs . ...and with higher level of oil, the crankshaft is submerged and begins whipping the oil into a foamy mess.. foam does not lubricate .. thus bearing damage occurs .. plus the pressure causes oil leaks to start.      maybe you are just at the critical level ?  Dont know, but I fill mine to high side of mark with dipstick not screwed in ... never had a clutch fail in a dozen ATV, UTV over 40 years ... and NEVER use full synthetic oil for cars in them... only wet clutch oil 

^ you took the words from my mouth,..

 

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  • 1 month later...
On 12/21/2021 at 12:00 PM, johnney said:

i have a 2011 hisun ys 400 and i can't seem to keep a wet clutch in it . is there any upgrades or heavy duty clutches for these machine 

gotting a little expensive putting 300 dollars in it every 2 years

Are you changing the drum also? Oil filter?

 

Have you checked the oil passages to make sure they are clear?

 

Maybe a more regular/frequent oil change? Different oil brand? Different filter brand?

 

Don't use the clutch as a brake.

What I mean is, don't use the gas pedal to keep you from rolling backwards while facing uphill.

 

Make sure the vehicle is able to be pushed by hand I on a level surface. Maybe brakes are sticking. Or bearing issues.

 

Steep inclines in high gear?

 

Maybe change the settings on the pre-load spring on the cvt primary drive clutch. You may lose a little topend and holeshot. But could last longer.

 

OEM tire size?

 

Just a few thoughts.

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