I have a 1986 200s and I am stumped. With a new spark plug it will run good for about 3 or 4 rides, but it smokes a lot, and then it fouls the plug.

I have tried to clean the carb, I have adjusted the valves, it has a new air filter and new oil in it, and it just keeps on smoking and fouling plugs.

I was thinking it either needs a smaller main jet to lean out the air/fuel mixture, or it needs a new top end.

What do you think?

When I pull the plug it is black and dry looking, and I have always been told a black wet plug means a rich mixture, but like I said, the plug is pretty dry.

Thanks in advance.

 

is it white or black smoke?

white= is burning oil

black= is running to rich

 

to be honest it was smoking black until i cleaned the carb now it's more of a grayish white.

 

time for a top-end

 

ehh kinda what I figured. I'll probably have to have the cylinder honed too won't I?

 

bad rings or leaky valve seals

 

okay thanks for the input. Looks like I'll be putting in a top end kit.

Do you know of any cheap places for it besides denniskirk and rockymountainatv?

 

yah. bluish smoke is a top end rebuild time. i'm too lazy to do my 70, so when its cold i leave a pretty long trail of blue smoke behind me. its funny.

 

idk know about the blue smoke tell me more!!

one more thing check your oil if its like milky or even white that could be the problem.if you been running some deep stuff water gets in the oil