jetting in the cold

[shee2000]

alright guys need some help right now im at a 340 main and i no that ok in 70 plus degree weather. but it is starting to get into the 60's now how much bigger should i go a 350 or 360 mods should be in sig.

[GrMeyer]

alright guys need some help right now im at a 340 main and i no that ok in 70 plus degree weather. but it is starting to get into the 60's now how much bigger should i go a 350 or 360 mods should be in sig.

 

How is the intake set up on your bike? What is the elevation?

[GrMeyer]

Also seems Rich for no port work

[shee2000]

im at sea level with pods

[GrMeyer]

I run 27.5 and around 330 at sea level and about 40-50 deg when I ran my fattys

[shee2000]

i was at 320 and it wasnt enough between 70 to 80 so i jumped up to a 340 i just wanna be safe

[GrMeyer]

i was at 320 and it wasnt enough between 70 to 80 so i jumped up to a 340 i just wanna be safe

 

let the bike idle and get a can of carb cleaner. Lightly spray each area from the jugs back and see if the idle will change. 340's on stock jugs seems really high. You might have an air leak.

[shee2000]

let the bike idle and get a can of carb cleaner. Lightly spray each area from the jugs back and see if the idle will change. 340's on stock jugs seems really high. You might have an air leak.

i already did that jus to make sure and there was no change

[AKheathen]

yah, wow. fatties should not need to be jetted that high, really. check your silencers/packing, float height, and then go do a plug chop (proper) rule of thumb is 2 sizes differnce between summer and winter, unless you live in a snow area, then it changes more.

[shee2000]

i will have to check out the floats and packing later. and i thought that a 340 was high also

[banshee67]

colder air is more dense so colder air = more air. more air = more fuel. i wouldnt think you would need to go up to high. maybe one jet size since you have a few mods and all.