SF1 Top end rattle

[mikeringrose]

Hello,

Being relatively new to the Laverda scene I hope you chaps won't mind me asking a daft question. I have read some threads and I think I have identified my rattle in the top end. I have one rocker that appears to have some end float (the other three do not move at all) and more worrying is the click I hear and feel when I hold both end of the cam and turn the engine over. Looks like the cam halves are an issue here? please advise.

My question is do I have to take the head off in order to remove the rockers and cam halves? Also I understand the key on cam is for location only so how do I rectify the cam fit issue?

Thanks
Mike

 

[phil37]

Hi Mike - head really needs to come off. The cams should be a tight fit in the flanges. I have succesfully repaired this fault with a home nickel plating kit - plated cam ends so they again were a tight fit in flanges. On my own bikes - i extend the keyway to the bearing area and press halves on with  a hydraulic press. i know that the key isn't there to do the bulk of the work - but if it pushes hard into flange slot along the whole length it seems to help - Regards - Phil

 

[Tippie]

As Phil says. They must be a tight interference fit.
If you haven?t got a home nikeller kit under the sink, Paradies sells undersize, tighter flanges.
You can also shim up the end-float in your rocker arms, do a thread search, Piet covered it fairly recently.
Doesn?t be no daft questions.

 

[sfcpiet]

As Phil says. They must be a tight interference fit.
If you haven?t got a home nikeller kit under the sink, Paradies sells undersize, tighter flanges.

OCT in Germany and van Dijk in the Netherlands can supply flanges with a pinch bolt, work perfectly!  Installation guide requires a balancing hole drilled in the cam chain wheel in order not to disrupt the smooth running of the twin!

piet

 

[mikeringrose]

Hello,

I have removed the cylinder head and as suspected the rev counter drive end of the cam is loose and moves slightly independently of the other half of the cam. Also there is 11 thou end float on one rocker.

Whilst removing the head I noticed the cylinder barrel move slightly but not up the studs, more a slight rocking on the studs. Some oil then seeped out between where the base of the cylinders meets the crank cases. I wonder have I disturbed the gasket and now need to remove the cylinders and replace the gasket? I would hate to find I have an oil leak after putting the beast back together.

Does anyone know where I can buy shims for the rocker?

Thanks
Mike

 

[sfcpiet]

Mike,

Chances are 50-50 that the base gasket remains oil tight...

see Murphys' Law #8. The 50-50-90 rule: Anytime you have a 50-50 chance of getting something right, there's a 90% probability you'll get it wrong.  (thanks to Gerald!)

piet