Jetting starting point

[The Axman]

Ok, I have finally managed to buy and install my engine mods. :thumb: I have an '01 KDX 220. Wiseco piston, Delta II reed cage, K-G35 pipe, Turbine Core II silencer and airbox lid looking like swiss cheese ;) . Stock carb. After reading the recomendations on Canadien Dave's tech tips page I should be running a 145 main and 42 pilot. However it says with a rad valve I should drop the main and pilot 1 size (142 and 40). With a Delta II reed cage do I lean the jets also? Temp 65, humidity 60. I'm thinking of sticking with the 145 and 42 and doing some field testing. What do you guys recommend? Thanx Ax.

 

[Dazza]

You are on the money.
Yes run with the 145 and 42 and field test.
Jet's are not expensive but a lean out with lean
jets is.
Start on the rich side and work towards the optimum jets.

 

[canyncarvr]

I found the DFII to run RICHER than the boyesen. That is to say to be jetted correctly, the DFII wanted a LEANER jetset than the boyesen.


Absolutely start rich and work down. If there is ANY question, keep the plug chop tests (WOT) time to a minimum for starters. Say 10 seconds or so.

Have fun!!

BTW...lo or hi on the DFII?? Don't shortchange yourself by not trying both settings.

 

[The Axman]

Based on your comments CC I went with the lo setting. I don't ride enough in a year to worry about wearing them out. My closest riding area is a 2 hour drive. I'll be lucky to put 50 hours on the bike each year. If I have to replace them once a year that is a cheap price for the grin factor. With any luck I'll be riding more in the future. Me and my brother are going to give enduro and hare scrambles a try next year.