never ending clutch slippage woes on suuzki gn250

[gargantua]

HI,

 

The clutch slippage on my 2002 gn250 (now at 80,000km) has been going on for a year already and the thought has ran my what it will take to get the frickin problem fixed!!!

 

I have changed the entire housing (includes the inner basket) and clutch plates as part of regular maintanence at 50,000km done by professional mechanic. Not a problem until at 60k km, where slippage problems surfaces more prominent at high rpm of above 3,000. Since then, 20,000 km later, the problem is the same as the day it started!! I have since changed to brand new, the clutch plates twice, the pressure plates once, clutch springs once and put back the old housing just to check if its a manufacturing defect and problem is exactly the same. All sprockets are original with original tooths. Engine oil has been using the same for 3 years and tried changing to 2 other brands and recommended by suzuki, stilll the same result. I have confirmed with 3 mechanic and all give the same assessment of a slight slippage at higher rpm. Slippage though slight changes completely the feel of the bike. The bike has just adequate horsepower and I need it! Any ideas before I start throwing parts at it? One mechanic has mentioned possibility of clutch holder..is that the outer basket (right underneath right side casing) that hold the cluch sping in place? and what could possible be wrong with that? Its not listed as a consumable. Another thing though, at one time when new spings where put in, the bike suddenly ran extremely well for the first 2 kilometer and immediately started back to its old problem afterwards..grrrr.not sure its the spring or the act of putting everything back in place...

[darren_soh86]

hi there.. u ever thought it may be due to the oil u use in ur bike? i dunno the cause.. but juz a suggestion.. try changing oil type?

[stsoh]

since u have change clutch plates, spring n housing with same effects.

engine oil have try several brands, still have same problems.

 

i wondering wat type of engine oil r u using?

motor oil (for car use) or motorcycle oil (for bike use)?

motor oil (for car use) have anti-frictional additives tat cause clutch-slip.

if u want to use it, make sure it have API SG or SH and JASO MA gradings.

 

if after using new clutch spring works for a short while, maybe u should look for a stronger clutch spring.

[gargantua]

I have used mineral based oil for the past 3 years. When guan hoe change the clutch plates the second time, they change into mobil motorcycle and I tried some other brand all motorycle oil use as well just to be different. I am pretty sure its not the oil.

[Phang]

Does the slippage happen only when the engine is warm or not engine temperature dependent?

[snowparang]

Do you have the parts breakdown? Check that there is no missing washer/spacer etc!

 

Did you touch the gearbox recently? Checked the gears?

Chain and sprocket?

[drfunk]

i think its the clutch springs, try changing to a tighter, aftermarket clutch spring, should reduce ur slippage, but get ready as clutch cable has higher tendency to snap

[Phang]

for your reference

 

http://www.cmsnl.com/img/Suzuki_CLUTCH_GN250_1998_EW-partslist-big-SUE0032FIG14.gif

[gargantua]

Does the slippage happen only when the engine is warm or not engine temperature dependent?

Not temparature dependent but nice catch. Thanks.

[gargantua]

for your reference

 

http://www.cmsnl.com/img/Suzuki_CLUTCH_GN250_1998_EW-partslist-big-SUE0032FIG14.gif

is this image of the gn250 or a generic image? Thanks, its a direction I think I will take.

[buttbutt8]

sorry, any one care to explain what exactly is a clutch slippage??