jetting 4 vitos ss pistons up high

[Cory88]

Hey guys, ive been lookin at alot of othr jetting posts, and i cant find anyone with the same set up as me and i live 4126 ft above sea level. 

THE MODS:

stock airbox no lid

k&n filter w/ pro flo adapter

stock mikuni carbs

v force 2 reeds

advanced timing of 4

pro design cool head w/ 18cc domes

vitos forged SS pistons  65.5 bore

fmf fattys w/ power core 2's

no porting

elavation 4,126

91 octane gas

 

i dont want to buy a whole jet kit. I just wanna be directed to witch indevidual jets to buy.

the bike was previously jetted for diferent elavation, and i dont know what those jets are that are in it. 

 

So can u help with me choosing what jets to buy...

[Cory88]

And I run a 40:1 ratio

 

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[WINDYCITYJOHN400]

At THAT elevation?????

 

I'm guessing you should try calling Vito's and talking to Lane.

[wayne_smith97]

Is your crank trued and welded? You shouldn't put that much compression on a stock crank. I'm assuming the comp is high due to the 18cc domes. You might need to be on race gas. I would do a compression check to see where you are before chasing jetting. Detonation is a bitch

[Cory88]

Im only at 150 compression, both sides.. no its not trued.

 

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[Cory88]

I took the carbs off, they got 320 mains and 35 pilot jet. The banshee toolkit recommends 470 mains and 45 pilots.. idk what do u guys think plz help. Wanna ride

 

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[Zillaguy]

That is WAY off^^^ At your elevation that is too much fuel... Figure, less oxygen you need less fuel... I'd say 280-300 main and 27.5-30 pilot max. LOL 470 mains, yeah if you were in a 50% oxygen environment!