Help jetting , wont alow to rev smoothly

[BENGshee]

Hi i have 01 Banshee

with this mods

 

Bored 1 size over

FMF Fatty

K&N with no lid pro flow adapter

 

Stock carbs with no tors (sinked) and with idle screws

elevation 400ft

stock pilot jets

Mains are 280

1 1/2 turns on mixture screw

 

 

Starts Right up,

but idles oK only on choke

If i screw in the idle screws it starts reving

 

When I hit on throttle it stumbles first and then revs.

MIDDLE Rev is fine but seems stil not powerfull enough

Once in three time about After letting go off throttle it doesn't drop the RPMS right away

 

Help please I think I need to down jet it.

[cav4ever]

What do your plugs look like

[JUSTWANNARACE]

Sounds lean.. try a 27.5 or 30 pilot... 310 main.. clip for the needle in the middle... jmo

[Dalton]

2nd that try 30 pilots 310 mains

[BENGshee]

What do your plugs look like

 

Actually they look black

[Dalton]

With your current jetting...running the lid on the airbox with vents installed about 12...would probably be spot on...

[BENGshee]

Sounds lean.. try a 27.5 or 30 pilot... 310 main.. clip for the needle in the middle... jmo

 

I am trying to get jets

But even al jet kits don't sell all stuff i need

I was told that the motor runs rich oposite but the idle is lean

What you think about this

[BENGshee]

The spark plugs are actually black too

 

So this is running to rich isn't it???

[Screaming Meemie]

I have the same mods (except for the overbore) on my 06 & at 480ft in MN i ran 240 mains & stock everything else on the stock carbs w/o tors & it was perfect. as it happens i had similar idle & rpm 'stick' problems too, it turned out my needles were bent at the tips... replaced em & it was 100%. maybe go 250 or 260 on the mains for overbore? hope that helps.

[Jereme6655]

The pilot jet handles from 0- 1/8th throttle

The needle handles from 1/8-3/4

And the main jet handles from 3/4 on......

 

That being said FMF pipes really like 27.5 pilots. the main being around a 280ish seems decent.....maybe 290 if you have pod filters.

 

The reason it is not coming down smoothly and quickly to idle is because it is starving for fuel........remember......2 strokes will free rev or rev hang when they are run lean on fuel.

 

You can order jets online or from our site sponsors.........watch out though....while I've found mikuni main jets at snowmobile stores that will work in the stock carbs.......the pilots are banshee specific.....