Clutch and Primary Chain

[Simcha]

I am in the process of rebuilding my Sf3 750 and just checking over the engine and I have a few question please? The engine has never been apart and has covered around less than 20,000 miles. Everything seems to indicate the engine is sound ( I bought it as a non runner) but I thought I would check the clutch and primary drive. All appear in good condition but I did notice a slight movement when checking the clutch basket. Should there be any movement at all? Or is a slight wobble acceptable? Also I read about changing the clutch rubbers as these fail? Can I check these without removing the clutch? If I do need to remove the clutch to check, is it worth changing the primary chain at the same time?  Is it difficult to remove the primary chain and clutch assembly?
To be honest I am tempted to reassemble with new gaskets and oil and see how it runs. Is there anything that I need to look out for? Sorry for so many question. This is my first Laverda after years on and rebuilding other bikes!

 

[Ernesto]

Hi,
if the engine has never been apart, the rubbers have hardened
and have lost their function of damping.
Check this for the procedure of changing them:
http://laverdamania.net/fichetech18gb.htm

Ernesto

 

[Tippie]

Slight is a very general term. A scrap of movement is not going to mean imminent self destruction. There is a thread now "crankshaft torque" you have probably read if you do want to remove and refurb it. There are plenty of posts regarding oil pump shaft removal and replacement, hence ignition timing, here on the forum. Most people opt for either duplex or two single row primary chains these days, but if you want to replace a triplex make damn sure you know it is proper spec (I have broken two and now run two singles on my road and race bikes), OCT (maybe others too) can supply proper triplex. At your mileage it might pay to replace it before too long, depending on the type and amount of riding you intend or can.

 

[Paul Marx]

You have already checked the clutch rubbers. If the clutch gear moves on the drum, the rubbers are shot.
Change the primary chain. 20 000 miles is the factory service interval for that and years of non use may well have initiated corrosion in the chain rollers. Play safe with a chain that's not worth much financially but will blow the engine cases if it breaks at least.

You can change the oil and run it and all may be well, or not so for long.
Dirty oil is enough to corrode crank bearings and big ends if left long enough.

Paul