Trials Australia Forums

Hi folks. Had the clutch on my daughter's Rev 50 give up on the weekend. All action at the lever, no action in the clutch. (Thankfully they are so low-geared riding with no clutch wasn't a huge issue and she could finish the day.)

Pulled the RH cover off tonight and found the "special screw" - yes that's what it's called in the parts diagram - which screws into the end of the clutch basket was loose big time, meaning the rod inside the clutch wasn't pushing against it, if that makes sense.

So, seems an easy fix. Screw it in, tighten the locking nut, and away we go.

My question therefore, is how much free play do I allow when screwing this in? Eg. screwed in until resistance just felt gives zero movement at the lever on the other side of the engine (the lever that the cable actually pulls.)
Back it off an eighth of a turn gives about 3-4mm free play at the lever.

I've mucked around with anything from 3mm to 10mm free play. Assuming the slack gets taken up at the handlebar clutch lever via the cable adjuster, it all seems to work. Note I've only tested this by putting it into gear and turning the rear wheel by hand, not actually starting the engine.

Is there a recommended amount of slack in the lever that I should set via the "special screw" in the clutch housing? I'd rather find out now before I put it all back together!
Thanks.

Think about it this way.

With the Clutch lever not in use, the clutch plates are tight and packed together. If you screw in the bolt until it touches the rod, then back out half a turn and tighten, there will be free pay, but then when the clutch lever is pulled in it will actuate the clutch pretty quickly. Done!

Don;t forget though that if the plates are "sticky" or the fingers on the plates or basket are notched (by wear), the plates may not be able to move and thus stop the clutch working.

I ran cheap and nasty Castrol ATF fluid in the clutch and started the bike regularly and rode a couple of gears to stop the clutch sticking between motos.

Does that help???

BTW - nice little bike!