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2 Stoke power problem (no one knows the problem) PLEASE HELP


neilus123
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Hi Peoples


I have been riding a little Kawasaki KH100 for over 2 years with a problem that no one knows the answer to. I have tried other forums but nothing has worked so I trying one last time.


The bike starts first kick every time, will tick over lovely all day long and is as reliable as they come. The bikes engine sounds great no nasty noises.


Now the problem once you get to 7000 revs it has no more power it still revs to 9000 but just has no guts and can only get 45 to 50mph. I have just built another bike with the same engine and this goes like stink in comparison. It seems and feels like the problem bike has no powerband.


The bike has been re bored, up jetted, exhaust de coked, carb cleaned and new plug. I have changed the points and condenser to another used unit, changed the ignition coil.


Its seems to me that since I tried the other bike that its the powerband area it just doesn't have one that's where my problem lies.


Any ideas peoples

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Have had it rebored so assuming compression is ok and don't have any starting issues so think compression should be ok. Havent got a compression tester and don't know what it should be but will look into it. As for float again seems ok but not sure what it should be set to. Will try removing the carb on the quicker engine and see if that runs better. What effect does moving the needle height have.

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Needle height can affect the higher rev running.......if the needle is too low it won't go onto main jet as soon.....so it'll starve the engine of fuel. Have you inspected the rotary valve?

What colour is the plug?

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Havent stripped it down because its so dam reliable I would trust it to start anytime anywhere, plug colour is somewhere between the perfect rusty brown and black but not oily. Although it does seem to be running rich as it smokes like hell on start up when cold and its seems to use more 2 stroke then I can remember other bikes of mine using.

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It's got the correct plug in it?

The RD350 I had yonks back used to run out of top end puff when the plugs needed changing......I know you said that the plug was changed......but if it's the wrong one it could cause top end probs......just throwing ideas out mate..... :wink:

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Crank case seals in the bottom end


When they fail they can do one of a few things, cause the bike to cough mid-way up the rev range and then operate normally if forced, or they can just sap power off the top end if they only partially go.

Without them the bottom end isn't as pressurised as it should be so when the piston comes down on it's downward stroke which compresses fuel and oil together and fires it up a port, if you have a pressure leak in the bottom end it will work ok at lower RPM's as the pressure isn't pushing passed the seal, but at high rpm's it will cause the seal to break and you will have a loss of power.

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Crank case seals in the bottom end


When they fail they can do one of a few things, cause the bike to cough mid-way up the rev range and then operate normally if forced, or they can just sap power off the top end if they only partially go.

Without them the bottom end isn't as pressurised as it should be so when the piston comes down on it's downward stroke which compresses fuel and oil together and fires it up a port, if you have a pressure leak in the bottom end it will work ok at lower RPM's as the pressure isn't pushing passed the seal, but at high rpm's it will cause the seal to break and you will have a loss of power.

 

:stupid:


Had the same with an early 2-stroke. Replaced all bottom end seals and gasket. Problem solved!


:cheers:

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