tapping sound

[Steptoe]

I don't like those radial roller thrust bearings in any application - they don't actually roll. .

And you know why don't you......The outside of the rollers want to turn faster than the inside (inner distance versus outer distance travelled on a revolution of the bearing, think of a record on a turntable) , which causes flats on the rollers.

Hence they end up just sliding = then disintergrate

 

[cookie]

Does that mean that yours are up for grabs? If so let me know

well, i don't want them.

as i recall, one or two of the rollers were found to be missing when i took them apart, not that it would make much difference to how they were working. should be easily replaceable anyway.

if you still want them, PM me in a couple of weeks when i get back from hols. you can have them FOC (as long as i can find them).

 

[Valker]

Check the cam followers - they can often pit or crack causing a tapping noise.

Is it a big jobby to change the cam followers , can't find anything in the book about checking or changing them

 

[Rob Farmer]

Barrels have to come off or take the camshaft out and drop the sump.

 

[Valker]

tapping

Barrels have to come off or take the camshaft out and drop the sump.

Thanks Rob.Any one have diagrams/info to give me some idea they can post

 

[Valker]

And you know why don't you......The outside of the rollers want to turn faster than the inside (inner distance versus outer distance travelled on a revolution of the bearing, think of a record on a turntable) , which causes flats on the rollers.

Hence they end up just sliding = then disintergrate

Steptoe, do you think this would happen on a bike thats only done 26000 miles or is it a comman thing with these old engines.

 

[Valker]

Thanks Rob.Any one have diagrams/info to give me some idea they can post


NOBODY KNOW

 

[(RIP) maverick]

Thanks Rob.Any one have diagrams/info to give me some idea they can post

I replaced cam followers on the bumblebee last year and it is pretty straight forward.

Take off the exhaust + carburettors
Take off rocker covers
Turn the motor to TDC on one side perhaps to make it easier when you assemble it again later on.
Undo the four bolts on the rockers to remove the barrels. You don’t need to undo the heads so leave the two centre bolts as is.
Take the rocker assembly off and pull out the pushrods. Mark them carefully with the rocker assembly where what goes – ideally you don’t want to mix it up.
Pull barrels slowly back until the pushrod tubes come out of their respective holes. You can either pull the barrels off completely or possibly far enough back just before the piston pops out although not sure whether you can access the cam followers this way.
The cam followers are recessed in the same holes where the pushrod tubes plug into.

You can gently pry the followers out with some long nose pliers.

If they look anything like this well then they are FUBAR

Basically I went this far to get them out properly.

They are about £25 each to replace.

 

[Damien]

If you pull the cylinder completely off, leave the piston in the cylinder by removing the gudgeon pin. It makes re assembly easier.

 

[Valker]

Mine look like this and cost half the price from a guy that makes them on the gs-forum.eu

John

At last.. thanks for the info, I'll print it off and save it just incase it turns out to be the cam follower.

 

[Valker]

Tapping sound, Not the end float checked it, checked and reset valve clearance when stone cold other then the cam followers what else is there, the bike as only covered 26000 miles can it really be the followers at this kind of miles???