cb 750 f 1981

[helios]

normally i start my motor every week, however last week i did not. just now i tried and had severe difficulties in getting the engine running. after a while i succeeded but everytime the engine rpm became less untill the engine stppoed running. as it seemes 2 cilinders are not working , the left ones and oil  is ejected from the left exhaust pipe. Untill 4 weeks ago everything was working properly, however i have not driven the motor , but only started it every week without any problem Now this occures, for info the motor is parking i a gararge but the outside temperature is just below zero the past few days. Does anybody know what coul be wrong. The motor is parked at its jiff has no center standard.

[Re-run]

Well it is hard to say. It sounds like oil is leaking past the valves into the cylinders. How many miles on the clock?

[helios]

thnks approx. 47000 miles

[Re-run]

Well I would suggest getting long cotton swabs and run the motor till it is hot if you can, then let it sit a few days and swab the cylinders and see how much oil is picked up.

It could also just be that the fuel is not burning completely too after sitting for a while. The carbs gum a bit and fuel flow is erratic.