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| *Vultures Knob>>>Dirt Bike |
What could be wrong with my dirt bike? |
I have a 1969 Honda Trail 70cc. it will run but when i rev it up it wants to die and I can ride it and shift it like normal but can never go more than half throttle without it dying. what could I do to get it running good again? You just did a motor job. -Double check the valve clearence. -Make sure the valves aren't leaking. Bring the piston to TDC of the compression stroke (both valves closed). Remove the spark plug. With a blow gun, blow air in the plug hole and listen at the air box and exhaust pipe. Any hissing and you need a valve job. -Double check the points and timing with a timing light. -There might be water in the gas. Water floats in gas. If it was in the carb float bowl, when you rev the motor, the water would get sucked into the jets, clog them and drop back into the float bowl. -Drain the float bowl into a cup and see what comes out. Anything bad, drain the tank and install an inline fuel filter. -Clean the carb and jets with carb cleaner in a spray can. -The float level could be to low. Remove the float bowl. Hook up an auxilery fuel supply. Turn on the fuel and lift the float by hand. -The fuel should stop when the float is level with the carb/float bowl mating surface. -Try adjusting the needle height (on the throttle slide in the carb). Adjust the circlip up or down one notch at a time. -If you can't get it fixed from all the answers you get here, then it's time to have a mechanic look at it. It sounds like you may have a blocked air filter or a blocked fuel line/filter. Probably a dirty carburetor. Get some carb cleaner, remove the air filter and spray it in there while it's running and see if that won't clear it up. Also, make sure the fuel line is clear. My guess is that it's fuel related, so that's a good place to start. Yup, like the other couple of answers, it sounds like a fuel problem, but you may also want to check out your spark plug, and valve clearances, possibly the timing. Those old 70's will run forever, so it shouldn't be too bad of a fix.... Good luck, Stevo. If the engine gets too much fuel and not enough air it will stall like you describe. You can test if this is the problem by starting it with the air filter off completely and revving it while it is in place (don't ride without the filter though - if anything gets sucked into the intake your engine can be damaged). If an exhaust is too restrictive or blocked, it can also decrease the amount of air getting to the engine. replace the air filter check the jetting ,or the air and fuel filters, don't let anyome talk you into selling ,it's a classic and worth 4 figures + |
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