wisps of white smoke

[moolfreet]

Hello,
Finally managed t get the Sport up the 35 degree slope and out of the underground garage where she's been languishing for the last 3 months.
Good result - but having been for a quick spin I noticed wisps of whiteish smoke from the exhaust pipe coming from the rear cylinder when I stopped.

What could be the cause of it?

Any suggestions gratefully received

nick

[hendre]

white smoke usually means oil or water, could be that there was condensation water in the exhaust or the piston rings may be a bit stuck on your rear cilinder

[3potjohn]

A short ride may have just vapourised some water.Heavy white smoke may indicate oil burned off via valves. My experience is blue-black smoke when there is piston ring problems, particularly after running down something we have locally called Telegraph Hill. (On Tridents, not my Morini)

[moolfreet]

Thanks to both of you for the tips - I think the compression is a bit low on the back cylinder but it was the one that wasn't running properly for a while - well, not running at all actually, which is why it wouldn't make it up the ramp out of the garage.

Though the compression values from the book are 11:1 is that realistic for a possibly slightly worn out 30 year old bike? If they're low it could be the piston rings, gasket or valves, is that right?

André - how's that Cagiva cafe racer project of yours going? Still haven't got round to fitting all those parts you sold me but I'm working on it - it's just that work gets in the way a bit too often

nick