Clutch slippage??

[Commando X]

Biker bros out there i'm riding a cbr125r 07 model... recently i realised there r times when my gears will disengage on its own and engage back after 2 seconds..my rmp will shoot up high and i find that very disturbing..is this what we call clutch slippage? And i find my tyre grip on e road is not as strong already.. its just a 3 mth old bike leh..

[Raptor]

What grade of oil are you using? Too thin, eg 10W40 might cause clutch slip. Try 20W50 oil and avoid the full synthetics if possible.

 

Also it can be your clutch cable is adjusted too tight, ie no free play. Should have about 1-2mm free play at the lever. Too tight and its like riding with half clutch.

 

The last possibility is... your clutch plates are worn out.

[CoStar]

if ur bike takes hard effort to return to neutral..ur plates are worn. need to change em.

[zyrofillica]

hard effort returning to neutral means more force exerted to kick it back to neutral or hard to find neutral. meaning Kick 1st gear kick 2ndgear kick 1st gear kick 2nd gear... cant get neutral position.

[Raptor]

Another possible cause for clutch slippage is weak clutch springs.

[299]

for the tires, perhaps u should warmed up ur tires abit by going few rounds, worst get ur rear tire change.

[eedwinn]

If the free-play of my clutch is alot (like 5cm), will it cause any damages?

[Raptor]

If the free-play of my clutch is alot (like 5cm), will it cause any damages?

 

Can you engage first gear without the bike wanting to move forward ie clutch dragging? If it does so... you are prematurely wearing down your clutch plates.

[eedwinn]

Ok, maybe I overestimated. Max is around 3cm I guess. But nope, the bike doesn't move forward when I engage to first gear. So it doesn't have any effects right?

 

I guess I have to get it adjusted soon anyway.

[vfrT]

Biker bros out there i'm riding a cbr125r 07 model... recently i realised there r times when my gears will disengage on its own and engage back after 2 seconds..my rmp will shoot up high and i find that very disturbing..is this what we call clutch slippage? And i find my tyre grip on e road is not as strong already.. its just a 3 mth old bike leh..

 

Two ways to test if clutch is slipping / shot.

 

Static test.

1. Start engine and warm to operating temperature.

2. Apply brakes or butt front wheel against a wall to prevent forward movement

3. Clutch in and Engage 1st or 2nd gear.

4. Rev engine up to about 4000rpm and GRADUALLY let out the clutch.

 

If the engine sputter on and does not die immediately, its clutch slip. If it dies immediately. clutch is ok.

 

Dynamic test.

1. With bike in motion, grab a handful of throttle.

2. If the engine speed goes up without corresponding increase in speed, its slipping. DO THIS IN A DESERTED ROAD AND SAFELY. If yours is a powerful bike, make sure its not the rear wheel spinning under power ;-)

 

cheers.

[Izammo]

what if bike moves abit forward when engaging 1st gear from neutral?

[eedwinn]

Two ways to test if clutch is slipping / shot.

 

Static test.

1. Start engine and warm to operating temperature.

2. Apply brakes or butt front wheel against a wall to prevent forward movement

3. Clutch in and Engage 1st or 2nd gear.

4. Rev engine up to about 4000rpm and GRADUALLY let out the clutch.

 

If the engine sputter on and does not die immediately, its clutch slip. If it dies immediately. clutch is ok.

 

When we gradually let out the clutch, do we still apply the brakes or do we release them before revving?

[ahcongie]

i am having the same problem now.. but adjust the clutch cable can le.. auto move zzz

[vfrT]

what if bike moves abit forward when engaging 1st gear from neutral?

 

that initial jerk when changing from neutral to gear is ok. Continue with the test.

 

 

When we gradually let out the clutch, do we still apply the brakes or do we release them before revving?

 

Yes, the idea is to prevent the bike from moving (in the static test) so as to provoke stalling - hence you can apply the brake or put the bike wheel up against an immovable structure ... like a wall. The way the engine stall tells the diff between a good and a slipped clutch.

[Izammo]

that initial jerk when changing from neutral to gear is ok. Continue with the test.

 

so every day got the jerk, and just now from work, from neutral to 1st gear, no jerk. but engine DIE. haha. why eh?? first time experience.

 

Yes, the idea is to prevent the bike from moving (in the static test) so as to provoke stalling - hence you can apply the brake or put the bike wheel up against an immovable structure ... like a wall. The way the engine stall tells the diff between a good and a slipped clutch.

 

if doesnt stall its slipped? and moving off from gear 2 is slipped as well right? cos i dont think gear 2 can move off? thanks!

[ahcongie]

got my clutch cable changed , everything is fine now^^