jetting '01 CR 250 for high altitude

uhlanmc

Member
Aug 23, 2005
32
0
I am rebuilding my friend's '01. The bike is way too rich for the riding in the elevation (5,000ft). The carb is a mikuni, and I've heard of some people machining the slide to help dial the carb. I'm looking for a reference point with the needle, pilot jet, etc.

Thanx.
 

dale williams

Member
Feb 3, 2000
69
0
I have one of those bikes. I run a 15 idle jet, an S-7 needle jet (you buy them from your yamaha dealer), a 6BEH1-76 needle on the second clip and about a 380 main for altitudes around 5000.
 

bikepilot

Member
Nov 12, 2004
804
0
FYI the S-7 thing is the nozzel, i.e. part the main jet screwes into and you can get them from any dealer that is a sudco distrib (virtually all dealers are sudco distribs). I'm at lower altitude so my specs will not help you much.

good luck
 
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