Ducati Monster Forum

Hi all beloved Monsterian,

I just opened my M796 engine because of sudden break down (at 110mph) during my last ride.

I found that both of the cylinder head (timing system) very tight. Vertical head is the most tight

My bike is 55,000 km

i maintain my bike regularly at the Ducati dealership

but, when i send there for checking, they also dont know what is when wrong (new workers)
that why i decided to open myself

My question is
1. What is most cause ? camshaft or valve or something else

coz now i'm calculating whether to buy  used cylinder head (complete set) or just change part that broken

and i dont have special tools to open and examine inside the cylinder head and pain in the ass if i used normal tools  [bang]

ebay selling about USD300 including post to my country (used cylinder head) x 2
if i replace broken part, maybe cheaper  ;D

thanks in advance..
Hope you all can give me some ideas ..

You mean that the cams are binding due to insufficient valve clearance when you check the cam pulleys? Or the cam pulleys are binding because the valves are bent?

What happpend, belt failure or what?

What have you opened?

the cam can be rotate but too tight.. and i dont know which component is affected

belts are ok.. one valve was bent and corrected by dealer.

but the cam very tight to rotate...

that why i asked who got experience with this kind of problems, what is the most likely the problems.

Have you been back to the dealer?

Bent valve, replaced, cam hard to turn-sounds like incorrect closing shim. Or belt not in position.
"New workers" didn`t check shims/belt properly, just replaced valve?
If so, they should check/replace shims/belts without any charge. Do have them check both shims.

Any idea why the valve bent?
If piston clearance, shims and belts are proper this should`t happen. If wrong, it could happen again.

I also don't have any idea why the valve bent. Dealer only told me but no picture showed - during the inspection.
They 'corrected' the bent, not replaced. (make me confused for a while)
The belt seem ok.

I'll check the closing shims. I think i wont send to them for correction coz i think they still new and dont know what's wrong  [laugh]

"Corrected"?

On the invoice, any new parts? Damaged valve guide?

If "corrected" means straightened, then that valve should be replaced, and possibly the guide also replaced by a cylinder head specialist. Interesting to see how free the cam spins with the valve removed.

Do you know another shop who can give a second opinion?

If you cannot find a good motorcycle workshop to check the head, then try a high performance/racing car workshop. While they may not know desmodromics, they will identify a bent valve or damaged valve guide.

Good grief!  Corrected a bent valve?  That would mean less than .03mm run out and no less than .06mm anywhere between the valve stem and valve guide.  Please follow koko64's advice.

Take a pic (blur the shop name) and post it here.of the invoice.
Or tell what is says, work and parts.

Good idea Gert [thumbsup]