91 kx 250 blows smoke and drips alot of unburnt oil out the pipe
91 kx 250 Blows a fair amount of smoke out the pipe and drips a fair amount of unburnt oil out of the pipe connection. I am running 50:1 mix and it still does it. also it uses gas very quickly and fouls at least 1 plug per ridding day. It starts very easy and idles perfect, but often when you crank it it seems to have something holding it back.
Re: 91 kx 250 blows smoke and drips alot of unburnt oil...
Does it have a stock pipe,carb,any modifications! If its stock,I would put a new ring and piston in it,it seems like your getting a lot of blowby,also make sure your air filter is clean. It would help if you used an iridium spark plug.
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if its a 4 stroke and its the breather pipe then your getting pressure build up , what colour is the smoke , white or blue ? white is water and blue is oil ! water could be a seal or gasket leak , oil could be valve seals or stems or compression leak !
Assuming the bike idles smoothly and is not smoking you can pretty well rule out bad valves and piston rings. If the air filter is clean then intake should be okay. Are the valves set properly? Is the decompression lever and valve working properly? I assume there is not mud plugging up the pipe. That pretty much leaves the muffler on the right side having an internal collapse and is restricting the flow of exhaust gases. Remove the mufflers and see if the pressures are equal at the head. If the problem is still there then have the shop do a compression check. It is possible a ring has broken or is frozen in the ring groove. This would let some compression into the gear box and account for the lower exhaust pressure. I hope this helps.
I agree, Too much oil in the mix. I run at 40:1 at the moment but have also used 50:1 in the past with no problems.
Drain the fuel tank and re-fill with fresh 40:1 mix.
Tip the bike over on its side to run out the carb.