Jetting help needed new fmf expansion pipe

[blasterbrian]

Just got an fmf expansion chamber
I have
Fmf pipe
Dg silencer
V force 4 reeds
Stock carb
No airbox lid
Few profilters air filters cleaned and oiled with k,n oil each ride or 2
65.5 wiseco piston
B8es plug
Weather Temps are -20c at lowest and +40c at most
Elevation is around 248 m

 

[blasterbrian]

Just got an fmf expansion chamber
I have
Fmf pipe
Dg silencer
V force 4 reeds
Stock carb
No airbox lid
Few profilters air filters cleaned and oiled with k,n oil each ride or 2
65.5 wiseco piston
B8es plug
Weather Temps are -20c at lowest and +40c at most
Elevation is around 248 m

And gas is always 32:1 no oil injection

 

[blasterbrian]

Also was running a 270 with same set up on a stock pipe with dg silencer need to know where to start for plug chop

 

[Blaaster]

290-300 main jet, plug chop to confirm....

 

[blasterbrian]

290-300 main jet, plug chop to confirm....

Thanks you so much