Question about Motorcycles
You dont mention the age of your bike. I would suggest you might want to consider getting a hotter range plug. High mileage bikes may show wear and start consuming oil. A hotter plug can better clean itself at slower speeds. Ask the counter guy at your bike shop for recomendations.
Posted on Dec 03, 2012
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Posted on Jan 02, 2017
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.
< < READ CLOSELY > >
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.
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Posted on Apr 04, 2009
Based on the information given, I think you may have a hole in the top of the piston. It sounds like pre-ignition, ( AKA detonation and engine knock ). Pull the cylinder head and check the piston and cylinder head. Sometimes the top outer edge of the piston disintegrates due to the heat. Replace the piston and rings and remove the carbon from the head. Be sure you run 32/1 mix on gas and oil. That's 4oz two stroke oil per gallon of gas. Only use premium gas.
Remove and clean the carb. Be sure the carb mount bolts and carb manifold bolts are tight. An air leak will cause the engine to run hot.
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Posted on Apr 07, 2009
I would stay with the same heat range(BR8) to stay on the safe side. You didn't say if when you are at the camp sight the bike is cold and just off the truck or warm and right off the trail. But usually alot of 2strokes need to be cleaned out when their being warmed up or they can foul a plug. Get it started, blip the throttle a few times to get some heat in the cylinder and then hold it open until you hear it rev faster and run smooth. Thats usually enough.
Posted on Jun 26, 2009
My bike started doing the same thing. I pulled the carbs put new kits in them and it still does the same thing. It does not seem like a spark issue because the fuel consumption would not be this bad, but the floats looked good. The needle valves and seats are new. I am not sure what to think at this point. I even replaced the intake manifolds and flushed my fuel system. It starts good initially. It is almost like the fuel pump is pushing to much pressure and over coming the needle valve. Has anyone seen this before?
Posted on Aug 07, 2009
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