rocker wear, limits and all that?

Taffy · Apr 14, 2008

just want to open a thread to talk about rocker shaft wear, about camchain wear etc. i'll start the debate by offering the following:

1. when is the rocker shaft worn IYHO?

2. the rocker shaft has two holes out one way and one hole out the other. which way should they face?

3. which side takes all the wear?

4. when is the shaft knackered?

5. are they handed exhaust/inlet?

6. if they have a right way around, can they be turned over?

7. are the shafts expensive?

regards

Taffy

loonyberg · Apr 14, 2008

Is the rocker shaft the same as the cam follower shaft for the purposes of this thread? I know it might sound a daft question but one man's shaft could be anothers follower.
I think I was quoted about Ã‚Â£25 for the cam follower roller and about Ã‚Â£80 for the complete cam follower. I thought this was a bit pricey but if these fail it could be even more expensive to fix the resulting damage.

Taffy · Apr 14, 2008

the follower shaft is IMHO the shaft through the middle of the follower bearing.

no, i'm on about the pivot shaft for the rocker which is 3" long. i'vee never heard of anyone re-bushing the rocker so i guess all you can do is get new shafts?

regards

Taffy

Taffy · Apr 15, 2008

come on you lot!

dig in here!

Taffy

ned37 · Apr 16, 2008

but one man's shaft could be anothers follower.

geez, is that all you blimey's are about? :shock:

never wore out a rocker shaft, but if any bike will, its the 650 i've got. to be honest, i don't remember if the oil holes are on both sides, but if they weren't, you could drill it and then be able to turn it over if worn. i would think that the bushing would wear long before the rocker shaft, tho.

loonyberg · Apr 16, 2008

Ah, it's been a long winter

Taffy · Apr 18, 2008

more technical input please!!!!!

kzoo · May 29, 2008

An answer to Q#7 is no they are not expensive, I believe ~$20.00 USD, which is approximately 0.0000001 Euro these days... I was just speaking to a riding buddy that has a KTM, and he rotated the shafts on his bike.

I'm in the middle of changing out rockers on my bike, and didn't realize that the shafts may be directional i.e. two holes left / one right or visa versa... So now I can't remember which way they go...

As far as wear is concerned the shafts outta my bike show a bit at the areas of the bushings. If you're looking down at the side with the two drilled holes, with the black cap end toward you then the exhaust shaft wear is on the left, and the intake is on the right (corresponding to the bushing locations). In any event, for $20.00 or .0000001 Euro I'll just replace them for the heck of it...

whosahberg · May 30, 2008

i can tell you that the drain bolt magnet will show the first sign of rocker wear . the problem is you are unaware of the source

Coastie · May 30, 2008

Well Taff here's my HO.
Keep in mind that I'm a bodgy bush mechanic working entirely from memory.
1. when is the rocker shaft worn IYHO?
I would say when there is a measurable difference between the load and non-load surfaces - of course I'm measuring using the finger nail tool.
2. the rocker shaft has two holes out one way and one hole out the other. which way should they face?
In mine the 2 holes were facing towards the valves in each case. I don't think it would make much difference cos mines pressure fed and it all goes into the same gallery.
3. which side takes all the wear?
The lower inside quadrants had visible marks where they run in the bushes. Which makes sense.
4. when is the shaft knackered?
See point1 above.
5. are they handed exhaust/inlet?
I really hope not!!
6. if they have a right way around, can they be turned over?
I really hope so!!
7. are the shafts expensive?
Isn't everything???? But don't know

rocker wear, limits and all that?

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