Only one cylinder fires on my 1988 sporter could the plugs be foul

Fouled spark plugs are when they aren't firing, causing a cylinder misfire. Can be caused by a burnt electrode inside the plug from being old OR too much carbon or oil on the tip between the electrodes where the plug fires.

replace the injector in no 2 cylinder

How so it isn't fouled? If it is getting any gas at all there should be gasoline on the plug assuming the cylinder is in fact not firing. Is the plug sparking? If so what about the carb? Compression check?

do a compression test , could be a dead hole

WAY TOO MUCH! Check out the following link.

http://www.hdforums.com/forum/oil-related-47/

Mike

The blue smoke is OIL, coming from bad seals in the valves. It drains into the cylinders overnight and when you start the car it burns the oil off. This is probably fouling your plugs and if backfiring will fould the carburator. The miss firing is due to the age and most likely the timing of your engine, along with fouled plugs and carb.

Your cylinder is worn. Its allowing oil past the ring. The oil is fouling the plug and the burning oil is causing the blue smoke. After 22 years the Kawi needs a freshened up top end.

does not fire where? at the plug? have u checked the wire, cap..hmmm..77 ..how many miles on that motor? have u done a compression check? could be burned valve, fouled plug bad wire worn cap and or rotor ..check the obvious first. start at the plug..if it's not firing, swap it for a known good one.. if it doesn't fire, swap the wire, if it still doesn't fire swap cap and rotor..if that doesn't solve or identify where the bad component is.or if you find you have fire at the plug but still misses on the cylinder.... start looking inside.. run compression check... if it's low squirt oil in cylindeer and check again.. if it comes up drastically.. it's worn rings..but if it stays low probably worn valves. but i'm thinking its somewhere between the distributer and the plug.. good luck...

the intake gasket is your proublem it is very comman it lets oil into the cylinders and it burns the oil witch fouls ur plugs

it mit be out of time try advance your disbutor