Jetting Q's and elevation and low speed

[SHEEBANSAVAGE]

Hey all, I have a 2003 banshee, fmf pipes, pc 2 silencers, uni filter in stock air box w/no snorkel. I live at sea level and I am running 30 pilots, 270 mains, and can't remember the air screw adj--I beleive 2.5 turns out.

 

I usually run at seal level to 4000 feet but when I hit 3000 feet and up I notice its bogs alot more at low speeds and is harder to manouver through tight areas. At WOT its fine. What can I do to loose that low end bog? I have a second airbox lid that has the last few inches cut off it--would that help? Also, I have a timing plate thats not installed yet--could that help in anyway?

 

I know I probably will have to adjust jetting but what should I adjust? I assume its my needle and air screw? but what settings should I have them at?

 

Thx for the help.

 

Cheers

[SHEEBANSAVAGE]

Sorry--my needle is in the 2nd position

[SHEEBANSAVAGE]

Bump TTT

[dirtydownunder]

lean off your main. at around 2500feet, say to a 260main.

because your riding at a higher altitude, there's less oxygen and you need less fuel.

removing the lid, might make it too lean.

 

remember to re jet on the way down aswell.

[SHEEBANSAVAGE]

lean off your main. at around 2500feet, say to a 260main.

because your riding at a higher altitude, there's less oxygen and you need less fuel.

removing the lid, might make it too lean.

 

remember to re jet on the way down aswell.

 

 

Thx for the reply. I think that will help on WOT but what about lower speeds as I am crawling over rougher terrainÉ

 

Thx again

[dirtydownunder]

well 30 is a bit fat, you could try a 25 at around 2 turns from seated. (fmf say to run 30's but peeps get away with 25's (stock)

your needle is leaner (if you mean 2nd from the top) you could play with that (richer = clip down, leaner = clip up ) the main effects everywhere.

pilot is more 0-1/4 throttle but is still in use over the whole range.

[CarvedArt]

Hey all, I have a 2003 banshee, fmf pipes, pc 2 silencers, uni filter in stock air box w/no snorkel. I live at sea level and I am running 30 pilots, 270 mains, and can't remember the air screw adj--I beleive 2.5 turns out.

 

I usually run at seal level to 4000 feet but when I hit 3000 feet and up I notice its bogs alot more at low speeds and is harder to manouver through tight areas. At WOT its fine. What can I do to loose that low end bog? I have a second airbox lid that has the last few inches cut off it--would that help? Also, I have a timing plate thats not installed yet--could that help in anyway?

 

I know I probably will have to adjust jetting but what should I adjust? I assume its my needle and air screw? but what settings should I have them at?

 

Thx for the help.

 

Cheers

 

General rule of thumb:

○ If the air screw is less than 1-turn from Closed, it needs a larger Pilot Jet

○ If the air screw is more than 2.5-turns from Closed, it needs a smaller Pilot Jet

 

Basically if you're at 2.5-turns your maxed on the air adjustment so when you get higher, air density thins, and there's no way you can add air with the screws.

 

You need to adjust your mains for every 1500-2000 ft asl (1 size smaller for every 1500-2000 higher).

 

-► At sea-level I'd give it some 27.5 pilots and adjust the air screws. (You should be between 1 to 2-turns out.)

└► You'll also probably have to richen your needles to fix your lean condition with smaller pilots. (3rd-clip position)

-►You should be able to compensate for your mains enough by popping your lid @ 2000 ft (air screws may also need to be adjusted).

-►Advancing your timing will increase your low-end as well +4 is a good place to start.

...I think that will help on WOT but what about lower speeds as I am crawling over rougher terrainÉ

 

You're flooding your cylinders whenever you blip the throttle so when you back-off the gas you're having to exhaust raw fuel before the plugs can dry off and fire well.

Edited September 6, 2010 by CarvedArt