Moby clutch problem

Steve Hosegrove /

Hi

I have a Mobylette SP93 which will idle on the stand (rear wheel spinning away) but not while off the stand. It appears that once engaged it will not dissengage. I think this may be because one of the three clutch spring plates is weak, has anyone come across this problem before ?

Re: Moby clutch problem

Hayden Stevens /

I have a 78 Moby...If I'm riding along and then say come to a stop sign or something, if I don't rev the throttle, the motor will die....When I do rev it, it will idle high....If I'm already moving and I let go of the throttle, I will keep going at about 5-7 mph - that's how high my idle is.....

Try making your Idle higher......oh yeah...if you are stopped with that high idle, and you start to go...you will hear your motor go to a much lower pitch (sound) before it goes up as you accelerate......

Good luck

Re: Moby clutch problem

The primary clutch (on the outer flywheel) will pull, but slip, untill the bike goes sofast, that the 2 arms of the secundairy clutch swing out. These will not slip. The three plates of the primary clutch do not need much to start their work. Try tuning the idling speed down while the bike is on the stand. Ride a bit before you do it, so the engine is on working temperature. If you get it to only just hanging on, Turn rhe little screw a bit more down and then up again, until it idles away nicely (the turning up is actually quite important, if you tune it from high to low revs, you'll find that your idling speed has gone down after a few km's) and the rear wheel is in rest, or ocasionally gets a little pull. If your engine doesn't run such low revs, something else is wrong.Good luck.

1100194190_clutch.jpg

Re: Moby clutch problem

Steve Hosegrove /

Thanks for the advice, I will give it a try.

Re: Moby clutch problem

Steve Hosegrove /

Thanks for the info, I did not realise the role of the secondary (2 arm) clutch. I thought it was only needed to allow you to peddle up to a reasonable speed before turning the engine over, and the outer (3 plate) clutch engaged depending on engine speed. I

I can not seem to let the engine slow to a low enough tickover that the clutch lets go on its own accord though.

I have found that if I run the bike on the stand and apply the rear brake, I can sometimes keep the engine alive by reving the throtte at the same time (as sugested by Futaba).

Re: Moby clutch problem

maybe so. but you are wearing out the clutch.

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