Question about KTM EXC 300 Motorcycles

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I have no power anymore...I had the reeds replaced, new gaskets, tune up but now it runs worse than it did before I replaced everything... 1, 2, 3, gears have very little power won't take off like they're supposed to.

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  • arluke28 Jul 25, 2009

    Ive rejetted the carb, changed float needle, checked power valve....seems leaner now but still no power.


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The most common cause of this is fuel flow, check for plugged supply line from tank that is restricting flow, also a piece of dirt may be plugging a jet in the carb, take the car off and blow it out with compressed air, it only takes a tiny speck.

Posted on Jul 25, 2009

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It sounds like a dirty carb or blockage in fuel flow remove gas line from the carb then turn on the petcock on there should be a steady flow of fuel if not there should be either a bowl trap on the petcock that can be unscrewed and cleaned out or there is just a fuel filter replace it. Besides that you will need to remove the carb and clean it out, be careful not to bend the float when you take the float bowl off, often times there is just debree or water trapped in the carb float bowl you may not even have to totaly disassemble carb, do what I described then put the carb back on without the air box rev up the bike and cover the air intake with your hand at the same time this with stall the bike make sure while doing this you dont let off the throottle, repeat, to restart you make need to hold the throttle full for few kicks because of flooding however the method I described causes a high vacuum condition in the carb throat that often times clears out the blockage without having to do a full over- haul of the carb.

Posted on Jul 25, 2009

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Pulley Yanks out of my hand when trying to start storm cat generator


It will be the reed valves need replacing. When they fail it can create a suction as the piston returns. This, in turn, pulls the recoil handle out of your hand (and can damage the recoil too.)

The Reed Valves are located behind the carb and are easy to replace. Be sure to replace the gaskets on the reed valves and the 2 gaskets on the carb, as they will split when you replace the reed valves. If you use a split gasket, it can allow extra air into the fuel mixture, and result in the engine running rough or not at all. So best to change them as you go.

Best of luck. Let us know if you need any more assistance.

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BTW... We sell the reed valves and the gaskets! You can purchase them here:

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Sounds like an air leak... either at the base gasket or the reed valve gasket. or the carb/reed intake boot...MAYBE THE HEAD GASKET...

...AND ... get a qualified pro to look at your carb..tell him which parts you replaced...

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How do you do a tune-up

Improve the FixYa experience for everyone by voting.

Modern cars meke tune-ups extremely easy, A major tune-up consists of changing the oil and filter, replacing the air filter, and replacing the spark plugs, I also suggest checking for loose wire, cracking in the wiring harness, and checking the coolant. It's also a good idea to drive to the nearest AutoZone and get a free diagnostic scan and a check of the charging system.

The total cost for the above parts will run about $35.

All the best,


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1 Answer

There is no display light anymore.

Some consoles require batteries. Check to see if this is the problem. If the console does not use batteries, move on to Step 2.

    • 2

Remove the key from the console.

    • 3

Unplug the power cord.

    • 4

Remove the screws from the console hood and remove the hood.

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Turn the pulley until the reed switch and magnet are aligned with a 1/8-inch gap between reed switch and pulley.

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Replace the hood.

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Plug in the power cord.

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Reinsert the key into the console.

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Run the treadmill to check for a correct speed reading. This may take a few minutes.

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