jetting help

[rainmaker491]

Hello I am building a blaster for my son I put a weisco crank and piston and rings. Bored .80 over I have a fmf fatty with power core 2 silencer and boyseen power reeds & aI k&n filter wondering what size jets to run. Thanks for any help

 

[piezzi]

Hello I am building a blaster for my son I put a weisco crank and piston and rings. Bored .80 over I have a fmf fatty with power core 2 silencer and boyseen power reeds & aI k&n filter wondering what size jets to run. Thanks for any help

depends on what carb, what temp and what elevation you're running at. If it's the stock carb without the airbox lid, then you'll be anywhere from 270 to 300. Only a plug chop will tell you for sure, so start at 300 and work your way down.

 

[Awk08]

depends on what carb, what temp and what elevation you're running at. If it's the stock carb without the airbox lid, then you'll be anywhere from 270 to 300. Only a plug chop will tell you for sure, so start at 300 and work your way down.

i'll second that !
plus the addition of a leakdown test to confirm it's airtight,
before trying to jet it

 

[piezzi]

Good point, Awk. Be a biotch to melt down that new piston after you just got it back together for your boy.