Cooler weather jets

Joined
Jul 28, 2002
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#1
Ok so I'm gonna run the DER H/S this weekend,I jetted my 220 with the 145 main back when it was warm and humid,it is about 15 degrees cooler now and less humidity. I should be able to install the 148 jet (less dense air more gas) and adjust the air screw and not have to worry about being to rich. Does that sound correct ?
mods, fmf rev,air lid removed
 

Braahp

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Jan 20, 2001
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#2
Yeah go up a size but that sounds like a mighty lean main the 145 unless your at some high altitudes.
 
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Jul 28, 2002
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#3
The 145 main is the stock jet for the 220, It's what C-dave recommended as a starting point for the mods I have and running at sea-level up to 3000'. IT runs good with that jet.The 148 should richen it some right ?
 
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Apr 30, 2002
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#5
It's going to be in the mid 60's this weekend, you should be fine with the 145. I ran the 145 main all last winter on my 220 w/ the woods pipe air box mod and DF II reeds. Maybe I'll see you at the race Sunday, my no. on my bike is 902. Good luck!