its worth a try, the plug was pretty dark.
i just worked up a sweat making a fool out of my self riding around at night trying to start it. best configuration = choke full on and full throttle. it would hit on about one out of four strokes, as long as u kept pedaling or had some slope.
b4 i did that i started it with the choke off and it ran for five seconds at full throttle and died abruptly.
i sprayed everything down with engine degreaser and hosed it off so i could see any new oil spots after i had run it for a while, but there aren't any.
one of my front motor mount screws broke a while ago so the motor as only been held on by the rear clamp, seems to be holding up just fine, but it my be connected somehow.
sure miss the days when this thing ran.