What is the standard (emissions) jetting as new ?

[Eric K]

Originally Posted by skid jackson

I was running a 45 pilot, #7 slide, cck needle at middle slot, 178 main. The bike seemed rich off idle. Spooge on pipe and plug always looked wet so I changed the pilot to a 42, air screw 1.5 turns out.

Ran that the last few times out and now it seems a tad lean off idle. was thinking about putting the 45 back in. What can I do to richen up the 42?? someone suggested raising the needle one clip.

If I decide to put the 45 back in, what can I do to lean out the 45??

What year/size is your engine?

My '01 XC300 had similar symptoms you are describing, with oversensitivity to slight temp elevation changes. A #8 slide notably reduced the jetting sensitivity.

My '06 EC300 is happier with a #7 slide.

Both deliver nearly identical linear strong power. They torque great down low (credit RB-designs head mod), pull smooth through the range with a very strong pull on top to about 10k rpm (credit stock GG pipe and Doma pipe). The power delivery has not let me down in any situation.

[skid jackson]

Eric I'm running an 06 300.

Stay upright great reply!! that was an excellent description of 4t'ing. In fact my bike has been doing quite bit of 4t'ing (wet plug & spooge) until i went to the 42 pilot. 3 rides ago. still might 4t a bit but i'm working on dialing things a bit more. I'll get this sucker dialed yet!!