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Discussion Starter · #1 ·
First off hello , a newcomer to quads here. My girlfriend has an 86 250x that runs great till it gets warm, then it dies when she comes to a stop and it is a royal pain to get started again. rebuilt the carb ...has a new air filter , but other then that we are at a loss. any help would be great, thanx in advance for your time.

allan
 

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Welcome to the forums.... I would say that it's too lean. What mods has it had done? pipe? what kindof filter? ect. When you rebuilt the carb was it acting like this before as well? what jets did you use?
 

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Sounds like the valves were adjusted to close.
 

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Discussion Starter · #5 ·
Welcome to the forums.... I would say that it's too lean. What mods has it had done? pipe? what kindof filter? ect. When you rebuilt the carb was it acting like this before as well? what jets did you use?
the bike is completely stock with a brand new foam filter and stock pipe, hahaha i didnt look at the jets when we put them in .... assumed they were the stock size. we have a book coming but wanted to see if it was a common problem other people might have had.

allan
 

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Stock should be 122 main and 35 slow jet for the 87 model and the air mixture screw is 2 1/2 turns out from lightly seated. If you didn't do a valve adjustment I would deffinitely check them, You will need to be at TDC compression stroke "T" mark alligned with the knotch in the sight hole. if the exhaust valve is tight rotate the engine 180 degrees and allign the "T" again, also another thing that will cause a running issue is the decompression lever you want no more than 2mm of up/down motion on that lever. its located on the top right (kick side) of the rocker assembly cover. You will check that with the engine at TDC on compression stroke the "T" mark alligned with the knotch in the sight hole. If all that check out bump up the main jet to a 125 and turn the air screw out 1/2 turn and reset the Idle. if you remove the big plug on the left case you can turn the engine wih a 17mm socket just kick it and see which way the flywheel turns and turn it the same way. the sight hole is right beside the big plug by the way it's the little plug. do not mistake the "F" for the "T" the "F" is for 1400 RPM advance timing check with a light.

Note: you do not have to remove the carb to remove the main jet. just drain the bowl and remove the plug on the bottom 17mm and then a 7mm deep socket to remove the jet.
 
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