lifan 125 clutch issue

[Wert]

Lifan 125 motor.
My Lifan 125cc pit bike Clutch Locknut keep on comming
loose although I have tightened it properly and bended those wings over
on the locknut washer. What else can I do? Any advise?

 

[my67xr]

Welcome to Minirders

Drop in and say hello in our Introduce Yourself thread while you're here.


Are you tightening it using the proper Castle Nut Tool?

You could maybe pull it apart, clean the threads on the crank and in the nut with brake cleaner and put a bit of Loctite on it before doing it up.
I don't see how the nut can come undone when those locking tab's are bent over either.
The nut has to have movement to bend the tab's back.
Maybe you haven't tightened it enough ?

Are you using the dished spring washer behind the nut too ?
See Part #22 here-

It has outside stamped into it to tell you which way around it goes.

Cheer,s, Craig

 

[Wert]

Thank you for the welcome, will say hello on the Introduce thread.
No I do not have a Castle Nut Tool. Used a punch and hammer to tighten it. It started like this. It is my sons bike and we were riding in the field when it suddenly died, when it tried to kick start it I felt no resistance. When I stripped the bike I found one of the locking tabs broken off and the nut, washer and locking tab laying lose in the clutch cowl. Cleaned everything and put it back together. Tightened the nut as far as possible, bent one of the tabs into the opening of the nut, started the bike again and it idled for a while and died again, kick start no resistance. Stripped again, nut, washer and locking tab in clutch cowl. What I do not understand is that the spinning of the motor and the tightening of the nut is in the same direction, the nut is supposed to get tighter and not lose.

 

[my67xr]

The crankshaft turn's over clockwise looking at it from the r/h side, so it'll undo the clutch nut if it's not tight.

Do you have a rattle gun you can use/borrow ?
Don't over tighten it though, you'll strip the thread's on the crank.
The other thing you can do is to jam a thick rag up between the primary drive gear on the back of the clutch basket and the big primary driven gear.
As the basket turn's to the right when you do up the clutch nut, the rag will lock up in between the 2x gear's
Give the nut a few extra tap's to make sure it's tight, Loctite help's too if everything is cleaned first

 

[Wert]

Thanks for the advice, will do this tomorrow and post the outcome.

 

[Wert]

Hi, did the loctite thing and it seems to work, but now I have no clutch. Can screw the bolt at the motor all the way in and all the way out, still no clutch.

 

[my67xr]

Have a look at page 12 here, or my picture a few post's up.
Sound's like part number 12 has fallen out of the clutch cover while you had it off to the Loctite the clutch basket nut.
That's the clutch pusher, the clutch arm has a cam on it which move's the pusher in to move the clutch inside the engine's r/h cover.

 

[Wert]

Stripped again, everything is there that is supposed to be there. Any way that I can test the clutch at this stage to see if it is working like it should?

 

[my67xr]

Pull on the clutch lever and check that the pusher move's out inside the cover

 

[Wert]

Sorry to be a bother, but has someone perhaps got a picture of part number 14 of the exploded view of the clutch.

 

[my67xr]

Here you go,