Need help jetting new mods

[steve89]

Hey guys, ive been working on my blaster for the last 3 weeks and im almost done, and will have pix in about a week or so I have a question...i understand you have to jet after a new mod but how much? Im removing my air lid, i have a Uni air filter, and im getting a full FMF gold series exhaust system. Should i bump up to a 290-300? THANX

 

[Awk08]

start at 290/300 and work down doing plug chops to verify each.
links to jetting, leakdown testing and plug chops are available here in my troubleshooting/maintainence thread..........

http://www.blasterforum.com/engine-13/my-general-troubleshooting-maintenance-30347/

 

[steve89]

good info, but im not sure if i missed the part where it tells me how many jet size i go up per mod. Ive heard 1 size, some people say 2 or 3 sizes per mod

 

[Blaaster]

From oil injection to 32:1 up one size.

From stock pipe to FMF up 3 sizes.

Take the lid off up 1 or 2 sizes depending on filter.

That gives you #280 or #290 main jet.

If you are near sea level play it safe and start at #300.

 

[steve89]

THANX..that was exactly what i was looking for...between the first post and the last i think i kno everything theres to kno about jetting,plug chops etc! Thanx guys...and by the way i have a Uni air filter and i live in central Pennsylvania if that helpsI:I

And ive also heard that if you switch from a stock air filter to a uni air filter you would need to go up a jet size also

 

[Blaaster]

From oil injection to 32:1 up one size.

From stock pipe to FMF up 3 sizes.

Take the lid off up 1 or 2 sizes depending on filter.

That gives you #280 or #290 main jet.

If you are near sea level play it safe and start at #300.

Thats what I meant by this./\ /\

A less restrictive filter can make a difference.

Before you attempt to start it, do a leak down test.