Well my bike is now a lot more user friendly, I think it was due to some crap in the carb , but not 100% sure as I have done so many things to it .
It still rattles but not like it did.
I took it a motor cross meet this week (Not to ride in it ) and was chatting to some of the guys with two strokes ...

Found it,
Many thanks...

I am sure I have found torque setting on here before , but buggered if I can find them now.
Can any one point me in the right direction please .

Retro wrote:Did you get to the bottom of this, as I think I have the same thing ?!!

Cheers

Not yet when I get time I will check out the gearbox bearings .

I would if I knew anyone, with one .
Billy no mates , with crm's .
Everyone has those orange things .

i had a similar issue with my mk2 ages ago after every ride it would rattle and clank like scrap van on the way home....this turned out to be the front sprocket on backwards check your subframe for any wear if you got wear from the chain thats the rattling
Thanks for your input , but I have put on ...

knackeredMk1 wrote:Have you seen - viewtopic.php?f=6&t=8753

I have now , thanks , it seem I may have to get some ear plugs , and hope nothing try's to get out of the engine casing !
Until I split the case and check inside !

It's not that either ,I thought it might have been but have put new ones on , and yes the are adjusted up correctly .
But thanks for the input .

Update have had reed valves out , they are like new, so it's not them!
Oh forgot to say it's not the power valve either .

I am trying to find out why my Mk2 rattles and clonks when decelerating .
It pulls like a train , but the noise it makes on negative throttle , sounds as if a bearing is going to let go .
I have just done the balance shaft and new chain and sprockets ,
Piston is okay as are the big and small end ...

pudzie83 wrote:i use plastic pop bottle caps on my crm they weigh less as well

That is what is on mine.

Thanks for that , as I said I have searched the net for a bung,
Never thought parts would be so difficult to get.
Might have to reconsider , and move this bike on.
Don't really want something you can't get bits for.

Ah conflicting information
I thought it ought to be vented , as not to create a vacuum , but couldn't think of the word vacuum .
Any chance of some kind soul posting a picture of one, so I know for certain ?

Ok thanks for that, must find an old flagon with a stopper.
I thought it might have been vented so the oil would flow, but on the other hand don't want water getting in whist going through rivers .

Hi, I am Stu , from Sunny Dorset.
I have just purchased a 1990 Crm , (its a dog) paid top money too :cry:
Compared to the pictures of the ones on this site , it looks like I found it in a skip .
But it will be used and abused so it does not matter what it looks like, I am not into polishing bikes ...