geting a fmf

[mud runner]

ok my buddie has a blaster with a fmf and a 240 kit and he has a kx100 that needs a crank the motor is already appart he told me if i put the crank in it and put the cases toghter he would give me the fmf and i was wondering what jetting i should start with its been ported by arnold with boycen ports no airbox lid 25-1 mix

 

[MURPH]

if you have a stock carb and you are riding now in the cold weather I would start with a 350 or 360 main and work your way down if needed. thats what I ran with the stock carb and that's what comes in the fmf power up jet kit

 

[97BlasterNewbie]

I run a 260 main with my fmf and did a plug chop seems to be right on. I am in FL at sea level and temps are around 60-70 outside

 

[MercMenace]

we need more info. Mods. Elevation. temps.

 

[mud runner]

i was wondering what jetting i should start with its been ported by arnold with boycen ports no airbox lid 25-1 mix

we need more info. Mods. Elevation. temps.

Here they are I don't know the elevation and it's about 50/30 degrees the weather changes here every other day

 

[MercMenace]

I would buy 280 - 330 jets. start with the 330 and plug chop to confirm. Come riding season you will want to rejet.

 

[MercMenace]

it's about 50/30 degrees the weather changes here every other day

This is exactly why I never jet in winter. every time the temp changes you have a chance of blowing up your motor.

 

[mud runner]

well i was gonna put a bigger jet than what it needs for the winter so when it gets cold it wont be running lean

 

[Blaaster]

I complement you for choosing a 25:1 oil ratio, it is excellent protection if you consider long periods of WOT.

You will be able to hang with the big boys with little fear of starving your engine of oil.

Bear in mind though you may need to increase the main jet by one size to compensate for the diminished fuel in the mix.

I need not remind you that you will need to plug chop to confirm.

 

[Herpderplol]

I would say a 300 for summer, 320-330 during the winter

 

[Zach214]

I have an fmf full pipe on my 99 blaster and its bored to a 240 also i run a 270 year round and it runs great