Jetting Questions 96 300 EXC

Joined
Sep 18, 2001
Messages
3
Likes
0
#1
Bike is a 1996 300EXC, engine is all stock, new piston and ring with less than 50 hours. Aftermarket FMF Gnarly pipe and Turbine Power Core Spark arrestor/silencer.

In warm weather I ride mostly 4000-6000 feet in altitude. Average temp is around 80-90 degrees. A couple of trips are to the 8000-11000 range, where it is down to around 70-80 degrees. In the winter, run mostly in the high desert at 2000' and 45-70 degrees.

I need some ideas on where my carb should be set. I'm sure that I jetted to rich as it runs well at lower altitudes but runs a little burply at 6000 feet and there is nothing over half throttle when I'm up at 9000 feet.
 

fremontguy

Lifetime Sponsor
Joined
Jul 1, 2000
Messages
580
Likes
0
#2
Since you didn't mention fouling plugs, you probably are close on jetting. What jets, needle and slide are you using now? On my '95 300, I run: 40pilot, 1370n #3, 172main, #7 slide. I ride at +-4k elev. To go up in elevation, would raise needle clip position and drop main jet size.