1997 Cr250 Jetting

[johnny5]

Hi everyone,

I just recently went out and bought a brand new procircuit works pipe for my CR250. I just put it on the bike and was wondering if I have to jet the bike differently than stock. Does the pipe make the bike run richer/leaner? With the stock pipe I went down to a 172 MJ, but I left all the other specs the same. Does anybody else have 97 with a PC works pipe running at about sea level and no extreme temps?

 

[Morvo]

Pilot jet should be 55, needle position 3rd, and the air screw 2 turns out. That would be with a mixture of 32:1 ;)