After 2-3 rides fouled plug. Excessive oil leaking from exhaust.
SOURCE: spark keeps fouling but no clue why
Are you losing gear oil.
When the crankshaft seal leaks, oil from the gearbox is sucked into the crankcase, and this can foul the plug.
Also check the plug gap, most guys set the gap too small. It should be 0,7mmto 0,8mm. The plug should be a B9 EG, or equivilant.
Now, you can also change the plug cap to a type that has a built in resistor, this also helps with plug life.
Note that 2 strokes use plugs way more than 4 strokes, and you should replace the plug every 15-20 hours to keep your riding pleasant.
Good Bike you have there
Cheers
Jon
SOURCE: wondering what the carb settings are for a 1983
The header says it is a 2004 YZ250F. That's a four stroke and gets no oil in the gas. Your 83 model is a two stroke. As far as the oil and gas mix, 32/1 is the proper mix. That's 4 ounces of two stroke oil per gallon of gas.
DO NOT USE STANDARD MOTOR OIL IN THE GAS.
Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
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Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Be sure the bolts are tight. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.
Please rate this solution. Thanks macnevind!
SOURCE: i keep fouling my plug on my 03 rm85. oil/fuel mix is right
what color is the spark plug when you take it out? All black too rich, a chalky white look is way too lean which is far worse than a rich mixture. I blew up my CR-80 when I was a kid from an improper fuel mixture. You really have to get that correct and the dealer can give you the numbers on that. Also you might wanna get a measuring cup from a local dollar store or discount store to help you add the correct mix into the gas. You said its boggy in 1st and 2nd....how is it from 3rd up? Has the carb been jetted for possibly a different exhaust pipe or filter that aren't on the bike anymore? Or did you change those components and not jet correctly? I'm going to log this as a solution, but its borderline a clarification request....
More than likely, a 2 stroke engine is very picky about the fuel mixture. Try and find a new one. there is a DT owners club and most club trials riders will be able to tell you where to find one. Or try "Wemoto" on the web. they may have the bit you are looking for.
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