Best Answer

If the bike currently stalls once it gets hot this should help.

Assuming your turning the choke off chances are you have a problem with your carb, specifically the choke. Good way to check is remove the spark plug and see if its clean. If you see black soot all over it your getting too rich a mixture and that's likely a carb fault. If so take it off, inspect the choke mech is working properly, make sure when you turn it off its actually all the way off within the carb. Since it off check nothing else is plugged and clean it. reinstall, start with choke on, bring up to temp and start again without choke

THis fixed my son's xr80 with the same issue.

Good Luck

also i would check your ring because i have had the same problem you ring gets hot and it looses its spring and doesnt have enough compression to start

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2011-09-14 08:42:36
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Q: You own a KTM 125 SX and it will only start when it's cold the gas is off and the choke is onWhat do you do?
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