Question about kawasaki KDX 125 Motorcycles

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Hi I recently bought a Kawasaki kdx 80.I've been riding it for about a week and has been fine,but a few days ago I filled the tank with premix 35:1 I think and not saying that's what did it but since then this is what been happening.When I first start it up it starts hard but once it's going runs jus fine,plenty of power low and top end and everything seems fine.But after 10 mins or so once it's warmed up it starts losing power.it will take off strong but if you stay on the throttle it like bogs out and like chokes and loses power.but if you downshift and open It up again the powers there for a second but them immediately starts bogging and cutting out.I've ripped the carb apart and cleaned everything.Adjusted the screws on the carb and seemed to work for a minute then same thing started happening,changed spark plug(checked it after riding and it had dry black deposits on it,and checked all the obvious things like lines and everything seems ok.is my piston burnt out?need new jets?new reeds or valves?previous owner removed packing from exhaust so it's hollowed out idk if that matters?please help i want to ride.

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  • kawasaki Master
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This Hi- Rev 2 Stroke Is Very Touchy. They Are Not Happy With Ethanol Fuel. Use 93 Octane Fuel With 3 OZ. Of Synthetic 2-Stroke Oil To 1 GAL. Of Fuel. Lightly Seat Air Screw On Carb And Turn (CCW) 1 1/2 Turns. (CCW) Is Rich.(CW)is Lean. Never Run Less Than 1 Turn On This Screw. Make Sure Reeds Are Good. Bad Or Broken Reed Will Run Way Rich. A Quick Way To Check Reeds Is To Remove The Rubber Duct From The Air Box At The Carb. Exposing The Throat Of The Carb. Run At High Idle(1500 RPM) Noticeable Blow-Back (OILY-FUEL) Is An Indication Of A Bad Reed. Make Sure Coolant Is Correct Also. Try Running Correct AUTO-LITE Spark Plug Or Iridium NGK. If You Replace Reeds Use 2-Stage Carbon-Fiber Reeds

Posted on May 09, 2013

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  • Master
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Black dry deposits are indicitive of a very rich mixture. On your two stroke, rich is a asset but you can go too rich. It sounds like for some reason you're getting too much fuel.

I think I ran into something like this before on a Kawasaki 80. Check the screws that holds the choke plate inside the carb. They will come loose and allow the choke to close on you while riding the bike. If the screw comes out, it will go into the engine and cause serious damage. If the screws are loose, them out one at a time and put a drop of Loctite 271 (red) on them and reinstall them.

Check the float and the needle and seat to make sure that you don't have any trash in the needle and seat. Also check your tank vent. If the tank builds up vacuum, you could be running out of fuel. Sounds funny that you can be running rich but run out of fuel. The problem is that you run out of fuel so quickly that the carbon from the rich mixture doesn't have time to burn off.

Good Luck
Steve

Posted on Aug 25, 2010

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