it is 10 yrs old ? it has been a summer bike , ridden , not serviced , sold on by each owner , at the end of each year.
not serviced .....cos well i only did 1k miles on it ...it don't need it .
9 owners
......cos it has had 1 owner each year ?
i bet valves clearances need doing . altho' too much oil will not help.
smoke on the overrun , i would suspect rings , smoke on startup valves and guides.
i would have thought the motor is pretty bulletproof , but it's 10 years old , of summer thrashing and lack of oil changes.
what should it be up for at a dealers ?