Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > Supersports: SS / SuperSport / Supersport 950 > noisy motor - problem????

[bally71]

got a 750ss 1999 .. injected .. and the motor sounds like a bag of spanners till it warms up

sounds like the pistons are slapping all over the shop

took it to get checked out and was told it's pretty normal for the 750. because of the piston expanding at a different rate to the barrels.

my 800 and 620 don't do the same

is it normal?????

is it something specific to the 750????

[bradders]

'they all do that sir' ask Matty; his sounded like an old box of spanners even after his spent loads replacing pistons

real answer dunno....some do (like Phil's) some don't (like mine )

[bally71]

cheers bradders

I hope your right .. It's got to get me to Italy in September

Anyone got any idea what causes it?

[skidlids]

Does sound like a piston clearance problem, I know on the 600s they could come with either cast or forged pistons, which did make a difference to the Cold Clatter that went on.
Also as we know with Ducati parts supply on the production line can be an issue so although barrells and Pistons usually have there markings Matched A to A or B to B there may be some that aren't

[Pablo Pirate]

Howdo!

Does the bike smoke at all??? The barrels used to expand quicker than the engine studs, causing them to snap (Most bikes have been upgraded).

Pablo

[skidlids]

Originally Posted by Pablo Pirate

Howdo!

Does the bike smoke at all??? The barrels used to expand quicker than the engine studs, causing them to snap (Most bikes have been upgraded).

Pablo

I don't think it was an issue on the later injected bikes

[bally71]

cheers guys

no smoke .. bike runs fine ..just sounds like it's going to fall apart

only 20k on the motor so not big miles

[DirtyDave]

Hi guys, I've got a similar problem with my '97 600SS (12500 miles on the clock)
The rear cylinder sounds fine. But the front sounds like a bag of spanners. There's no smoke and seems to ride ok (my first Ducati so can't really make any comparison).
It sounds exactly the same as the one in this youtube video:
http://www.youtube.com/watch?v=E022n8Z1JeY


I've done a compression test and the results are as follows:

From cold-
Front cylinder 120psi
Rear cylinder 115psi

After warming up on tick over for 5-6 minutes-
Front cylinder 75psi
Rear cylinder 80psi

Should I be worried? I'd like to loose the rattle, but don't really want to spend money on a rebuild if it'll still sound the same afterwards.
Any help and advice is very much appreciated.

[skidlids]

Originally Posted by DirtyDave

Hi guys, I've got a similar problem with my '97 600SS (12500 miles on the clock)
The rear cylinder sounds fine. But the front sounds like a bag of spanners. There's no smoke and seems to ride ok (my first Ducati so can't really make any comparison).
It sounds exactly the same as the one in this youtube video:
http://www.youtube.com/watch?v=E022n8Z1JeY


I've done a compression test and the results are as follows:

From cold-
Front cylinder 120psi
Rear cylinder 115psi

After warming up on tick over for 5-6 minutes-
Front cylinder 75psi
Rear cylinder 80psi

Should I be worried? I'd like to loose the rattle, but don't really want to spend money on a rebuild if it'll still sound the same afterwards.
Any help and advice is very much appreciated.

What Oil are you using, if its 10W40 try switching to a decent 15W50

[DirtyDave]

TBH I've no idea what oil is in the bike. I'll give it a change and see how that goes. Thanks.