550xp mkii running on

[spudulike]

1 hour ago, stewmo said:

So replace the lot then?

From the wear on the clutch, it looks like the clutch isn't sitting inside the drum as it should. This could be down to the clutch drum not meshing with the pinion correctly - sometimes happens when the machine is spooling down, the clutch unwinds itself and then winds back up in the wrong position - seen it when the clutch has been removed and not tightened up really hard once refitted.

You could grind the high part off the clutch but may be better to refit a new one.

Here is how it should look: - note the clutch sits INSIDE the drum!

[Stubby]

Is there a washer / thin spacer sat behind the clutch that should not be there ?

[spudulike]

I think it would have to be a thick washer from the wear on the clutch

[stewmo]

From the wear on the clutch, it looks like the clutch isn't sitting inside the drum as it should. This could be down to the clutch drum not meshing with the pinion correctly - sometimes happens when the machine is spooling down, the clutch unwinds itself and then winds back up in the wrong position - seen it when the clutch has been removed and not tightened up really hard once refitted.
You could grind the high part off the clutch but may be better to refit a new one.
Here is how it should look: - note the clutch sits INSIDE the drum!

Thanks again

Whole thing seems a bit strange but think best plan is to change it all. Fingers crossed

[Echo]

On 26/02/2021 at 16:57, stewmo said:

So I got the bearings etc off.

 

The clutch drum is marked on the inside by the needle bearing (see photo). That can’t be right can it?

 

Should it be replaced?

 

To my eye the clutch itself is fine.

 

Thanks

 

That's not fine, there is a build up of what ever in the corner of the drum. Something is holding the drum

in the wrong position relative to the clutch that spins around, it could actually be a fault in the machining

from new, sometimes there is a slip up make, a part not held in the correct position for machining, or the

machining set wrong in relation to where it should be, am thinking the shaft, the shoulder on it or what ever

stops the nut from pushing the clutch too far back thus keeping it tight, and the drum could be sitting too

far back from the mounted clutch shoes because of a measuring / machining error. I don't think you should

be wearing out bearings that quick, but the drum riding on the side of the brake shoes wont help, it could

not be good, looking at the shoes they are pushing side ways against the bearing and clutch drum, that is

not designed to work in that manner at all, there should be no side thrust worth talking about involved in

the clutch bearing set up.

[stewmo]

That's not fine, there is a build up of what ever in the corner of the drum. Something is holding the drum
in the wrong position relative to the clutch that spins around, it could actually be a fault in the machining
from new, sometimes there is a slip up make, a part not held in the correct position for machining, or the
machining set wrong in relation to where it should be, am thinking the shaft, the shoulder on it or what ever
stops the nut from pushing the clutch too far back thus keeping it tight, and the drum could be sitting too
far back from the mounted clutch shoes because of a measuring / machining error. I don't think you should
be wearing out bearings that quick, but the drum riding on the side of the brake shoes wont help, it could
not be good, looking at the shoes they are pushing side ways against the bearing and clutch drum, that is
not designed to work in that manner at all, there should be no side thrust worth talking about involved in
the clutch bearing set up.

It’s a little tricky reading your post because of the formatting but I think I get what you’re saying.

Maybe I got something wrong after changing the rim sprocket last time and it’s been off since then, causing the wear. Maybe it is a manufacturing issue? How to tell?

[htb]

Just have a good look at it once put back together to check it all lines up.

If you want a second opinion post a pic of it reassembled on here for constructive comment in case there is something amiss.

[stewmo]

Just have a good look at it once put back together to check it all lines up.
If you want a second opinion post a pic of it reassembled on here for constructive comment in case there is something amiss.

What do you reckon? Can’t see how it could be any different

[Alpasty]

Alignment looks ok as in front to back (clutch fully inside drum). But it doesn't look very central to the drum, unless its the photo angle. Looks like it is virtually touching on the right bottom side and a much bigger gap on the left top. Could that misalignment be causing the catching and run on? 

 

I can't see what would cause that unevenness though, unless a part has been manufactured wrongly, but surely that would cause terrible vibration? 

[Retired Climber]

Take a photo straight towards the machine, not at an angle.