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Discussion Starter #1
What would cause a freshly rebuilt 92 kx 250 be hard to start when it is cold. The motor has all new bearings and seals new sleeve and piston kit. The bike runs perfect after being started for the first time and will restart on the first kick after it has been run. This is a friends bike so any help will be greatly appreciatted.
 

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My son's 02 KX250 will not start when cold if he pulls the choke to ON. My other son's 00 CR250 will not start when cold unless he does pull the choke to ON. I'd try different combinations of choke ON and OFF, throttle closed and cracked open and see if you can find a conbination that the bike likes.
 

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Discussion Starter #3
I will pass that on to him he has just got the bike back together so he probably needs to fiqure a starting routine out that the bike likes.
 

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Clean out the choke circuit on the carb and raise the idle a little. If that won't help then it could be the reeds are bad.
 

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Discussion Starter #5
Clean out the choke circuit on the carb and raise the idle a little. If that won't help then it could be the reeds are bad.
I will also pass this info along as I don't think that he had pulled the carb apart. Can the choke circuit be tested by starting the motor and pulling the the choke to the on position if the idle goes up or the bike starts running rich that it in working order if not than it is stopped up, am I right on this.
 

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Remove the choke from the carb and spray carb cleaner through all 3 holes and blow compressed air through them. Then while the choke is out of the carb turn the black knob and see if it clicks or raises up and down. This is also the idle for the carb. If it won't click or raise up and down then buy a new one. If it clicks and turns up and down then turn it down all the way and then back out about 14 clicks which is the stock setting.
 

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It is probably just the bike. My son's KX 100 starts on one kick without the choke if the outside temp is above 70*. Now that it's colder, 40-50*. He has to have the choke on and kick it about 10-15 times with 1/4 throttle.
 

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I need a Help with a rigth mixed gas and oil

I have a 1997 KX125
32:1 with a conventional oil. 40 or 44:1 with a synthetic. I know some that run 50:1 with synthetic and I used to, but I like a good librication no matter how good the oil.
 
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