Clutch Clutch works Motor Runs No Motion.

[will_start]

Ok,



Bike stopped.

Clutch works to start motor, motor runs.
But I try and engage engine, and get no motion.

Took off clutch cover, and small cog still engages engine
with a push forward.

i think something is broke inside.

o o o

 

[AussieSteve]

Does the clutch slip at all when you're starting it?

First, as you're considering, try adjusting it.
It wouldn't hurt to remove the top clutch plate and visually check the pads, while you're at it, too.

It's odd that it grips to start, but not to run....
If the clutch all seems OK and adjustment doesn't help, it's possible that one of three woodruff keys has sheared, but is still working like a ratchet. (Not a big deal to fix.)
The countershaft sprocket has one, the primary drive gear on the RHS of the crankshaft has one and the clutch has one.
(Also one on the magneto rotor, but that's not the problem.)
You'd need to remove them one by one to check.
Do you have a clutch/countershaft sprocket puller?

 

[will_start]

I may have a sprocket puller somewhere.

The clutch doesn't slip when starting.

A. countershaft sprocket.
B. primary drive gear on the RHS of the crankshaft.

would I need to take motor apart to do this ?
Would that require special parts once it is apart ?
EG motor seals etc.

 

[Creative Engineering]

O.K.

First things first:

Is this the first build you have done.

It sounds to me like your engine isn't firing up...you just think it is because it's making a Brrrrrrr noise when you release the clutch.

Jim

 

[AussieSteve]

Jim, it's not a new build. It's been running for quite a while. (will_start can tell whether or not it's running.)

 

[Creative Engineering]

Jim, it's not a new build. It's been running for quite a while. (will_start can tell whether or not it's running.)

Strange...

It can only be something similar to what you had originally posted...like a ratchet effect...that is definitely a new one on me...but then again it's Chinese...

Jim

 

[Creative Engineering]

Start the engine...give it gas...the engine revs freely and is no longer engaged to the rear wheel...my brain is still trying to figure out HOW!

I've had a bunch of these apart...it seems impossible.

Jim

 

[Creative Engineering]

will_start,

Describe exactly...what happens after you start it?

Jim

 

[AussieSteve]

Start the engine...give it gas...the engine revs freely and is no longer engaged to the rear wheel...my brain is still trying to figure out HOW!
I've had a bunch of these apart...it seems impossible.
Jim

Yeah, it's a new one on me, too, but I can't see any other possibility. What else could make the clutch work only in one direction?

A. countershaft sprocket.
B. primary drive gear on the RHS of the crankshaft.

would I need to take motor apart to do this ?
Would that require special parts once it is apart ?
EG motor seals etc.

Only the side-covers need to be removed, the crankcase doesn't neeed disassembly.
No special parts except a new woodruff key if that's the problem. No seals needed.
(A woodruff key is a tiny, half-moon shaped piece of metal that locates the gear/sprocket/clutch on it's shaft so it can't rotate.)

 

[AussieSteve]

Jim, do you know where woodruff keys to fit are sold?