Maintenance & Technical > KX250 / KX125

Jetting advice needed for 2001 KX250

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KXcam22:
I am helping a neigbour jet his 2001 KX250.  Carb has a TPS and a electronic power jet. Any differences to watch out for when jetting with the power jet carb?   I haven't ridden the bike yet but he is describing what sounds to me like detonation at WOT.  I went through the carb today. Settings are: 155 main 48 pilot, needle all the way down, float level was OK.  This is for 2000' and low 70F temps. Manual says stock is 160/52.  If someone could suggests some settings that they use it would be a big help. Also, what are the chances that the power jet is not opening?  Is there an easy way to tell?  Thanks. Cam.

don46:
I ran a 158 and a 48, at 3300 feet. Did you pull the power jet out to make sure it wasn't plugged? It's in the base of the carb and should screw right out. As I recall the power jet activated 4-6000 rpm and shutdown at around 8000 rpm. Any chance somebody played with the timing? maybe advanced a bit to far? I can't ever remember my 01 detonating.

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