jetting range needed

[89blaster89]

i need a rich jetting starting point my mods will be: no airlid, full ct right bend pipe, vm 28mm mikuni roundslide carb (takes same jets as 26mm) aftermerket foam filter...

im currently on a 300 main jet and its runnin rich with full fmf and no airlid and aftermarket foam filter and im at 250 feet ASL

 

[mjgnslngr]

I'd try a 290 and see where it puts you. With my right bend and a 28mm I ran a 280 and got perfect chops.

 

[Blaaster]

Running 32:1 ratio a #290 should put you on the money.

You want a rich start you said.

With the cooler weather i would start at a #300 or #310 main.

 

[89blaster89]

Running 32:1 ratio a #290 should put you on the money.

You want a rich start you said.

With the cooler weather i would start at a #300 or #310 main.

but with a right bend arent the jets ussually richer than a fmf? im at 300 main with the fmf right now

 

[mjgnslngr]

some times yes, some times no. when i went to a right bend i only went up one jet size. from a 270 with a fatty to a 280. try a 290 and see what it does for ya!

 

[Blaaster]

You asked for a rich starting point, throw in a #310 and plug chop.

 

[89blaster89]

You asked for a rich starting point, throw in a #310 and plug chop.

alright ill do that and see how she runs and the bigger 28mm doesent really afftect the size of jets right?

 

[mjgnslngr]

alright ill do that and see how she runs and the bigger 28mm doesent really afftect the size of jets right?

yes it does anytime you change the air volume, you change the fuel requirements

 

[89blaster89]

yes it does anytime you change the air volume, you change the fuel requirements

you think the 310 will be a good start with the 28mm i will have?

 

[Blaaster]

You asked for a rich starting point, throw in a #310 and plug chop.

 

[89blaster89]

yes it does anytime you change the air volume, you change the fuel requirements

then why when people get bigger carbs do the main jets ussully get smaller? wouldint they get bigger since theres more air flowing through a bigger carb?

 

[mjgnslngr]

then why when people get bigger carbs do the main jets ussully get smaller? wouldint they get bigger since theres more air flowing through a bigger carb?

correct! more air means MORE fuel. think about it; 26mm carb, 300 main jet vs 28mm carb, 300 main jet. the 28 mm will flow more air and fuel with a 300 main than a 26mm with the same size main jet. thats why i said a 290 main (which is a rich starting point with a 28mm) set your needle in the middle, same (stock size in 26mm) pilot jet 32.5 and try it from there.

 

[89blaster89]

correct! more air means MORE fuel. think about it; 26mm carb, 300 main jet vs 28mm carb, 300 main jet. the 28 mm will flow more air and fuel with a 300 main than a 26mm with the same size main jet. thats why i said a 290 main (which is a rich starting point with a 28mm) set your needle in the middle, same (stock size in 26mm) pilot jet 32.5 and try it from there.

wouldint the 290 be a lean starting point then? you said bigger carb means bigger jets? and im at 300 with my 26 right now??

 

[mjgnslngr]

i think a 290 or 300 IS a rich starting point. like you said; i see guys who add bigger carbs have to jet smaller. a 290 will act like a 310-320 in a 26mm. with a 28mm a 290-300 will be rich.

 

[89blaster89]

i think a 290 or 300 IS a rich starting point. like you said; i see guys who add bigger carbs have to jet smaller. a 290 will act like a 310-320 in a 26mm. with a 28mm a 290-300 will be rich.

oh ok well i get what your sayin now, well ill drop in a 300 to start with and go from there, thanks man i was confused for a sec

 

[mjgnslngr]

oh ok well i get what your sayin now, well ill drop in a 300 to start with and go from there, thanks man i was confused for a sec

ha, welcome to MY world, im confused ALL the time!!!B)

 

[89blaster89]

ha, welcome to MY world, im confused ALL the time!!!B)

hows the street bike?

 

[mjgnslngr]

in pieces!!!! LMFAO!!!!!!!!!!!!

 

[89blaster89]

in pieces!!!! LMFAO!!!!!!!!!!!!

time to get a build thread up!

 

[mjgnslngr]

i know, i tried going on the gixxer forums but theyre a bunch of stuck up ass holes!!! still, i dont know how everyone would feel about a bike rebuild thread in a 4 wheeler forum???