Maintenance & Technical > KX250 / KX125

Any Ideas???

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kx666:
My shop has been growing rapidly since it opend a year ago, i now have 2 other mechanics working for me and we have a suzuki that has us stumped.  I have talked to other mechanics from shops i have worked at in the past and some racer buddys and still nothing. 

I know it is not a Kawasaki but this is our last hope...

It is a 1988 LT250R.  It came into the shop in early December, had been sitting for years, no spark.  The carb was the worst i have seen in over 10 years! replaced all of the jets to stock cleaned every port on the carb installed all new gaskets. 

I noticed a crack in the piston skert so I did a top end.  when compeated the engine held 7psi for 10 min with no drop on a leak down test

cleaning electrical connections corrected spark problems, tested CDI and coil to be sure.

The bike ran like new and the customer picked up the bike. A month later he called me to tell me that it quit running. He was ridding it, shut off the engine and it wouldnt restart.


when he brought it back it again passed a leak down test and compression test. I have found that it does start and run with additional fuel applied to the carburator with a syringe.  The carb looks perfect.  Thinking that it could be a lean situation we replaced the crank seals. It now runs only on the chock and if fuel is appliyed down the carburator first. I had a Keehin PWK 36 off a 1999 yz125 laying around and intalled it "for the hell of it" and it ran ok.  but wont run on the Mikuni TM34ss.

Any Ideas???  Thanks!
~steve

Hillclimb#42:
sounds like it must be running out of gas. like there is a blockage in the petcock or carb, or float hung up, but I know that is probably too simple. I did manage to get a float on wrong before. good luck.

kaw rider:
check the blend passage

kx666:
-Fuel has been replaced
-the float valve and seat have been replaced before the first time I ran it
-petcock flowes and after running the float bowl has fuel to the proper level
-all of the ports in the carb have been cleaned...

its seems like it is producing enough low pressure to draw the fuel.  I am half tempted to split the cases and look for a crack, but if there was a crack or leak the leak-down test would have exposed it.  :? 

maybe somthing unretated like changing the wheel bearings will fix it  :wink: ... i've seen stranger things happen  maybe sell him an extra kx 500 motor i have

I greatly appreceate everyones input, 

kaw rider:
You have a carb problem don't touch the motor. You have a pilot circuit problem.

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