Jetting numbers...the solution

1) what carb do you have??? stock one

2) What type of aftermarket exhaust do you have? fmf fatty pipe/power core 2 silencer

3) What type of airfilter do you have? i have a uni on a pvc makeshift intake

4) What kind of air box set up do you have?? cut that biotch out

5) What size pilot jets are you using? dont know havent checked

6) What size main jets are you using? 330 main

7) What needle position? 2nd
 
Guess it's time to update- Now that I have it running good!

1) what carb do you have??? OKO 30MM

2) What type of aftermarket exhaust do you have? Powerpros full exhaust

3) What type of airfilter do you have? UNI pod 2 stage

4) What kind of air box set up do you have?? CFM Style

5) What size pilot jets are you using? 52 Pilot like this best!

6) What size main jets are you using? 158 Main

7) What needle position? 3rd clip (middle)
 
Last edited:
1) what carb do you have??? stock

2) What type of aftermarket exhaust do you have? stock front homemade silencer

3) What type of airfilter do you have? UNI foam

4) What kind of air box set up do you have?? some holes

5) What size pilot jets are you using? stock

6) What size main jets are you using? 270 Main

7) What needle position? stock
 
Been a while since I did it... needle position may be wrong.

1) what carb do you have???
Stock
2) What type of aftermarket exhaust do you have?
Toomey B1
3) What type of airfilter do you have?
Toomey/Uni High Flow
4) What kind of air box set up do you have??
Vents
5) What size pilot jets are you using?
Stock
6) What size main jets are you using?
310
7) What needle position?
Stock
 
1) what carb do you have??? stock

2) What type of aftermarket exhaust do you have? Stock

3) What type of airfilter do you have? UNI foam I believe

4) What kind of air box set up do you have?? no lid

5) What size pilot jets are you using? stock

6) What size main jets are you using? 270 Main

7) What needle position? stock

The stock 230 jet was deff too lean with the lid removed, plug was white and it would run way hot. Tried a 250. Better, plug was now more of a grayish color, but it still seemed to get hot after extended higher RPM's(like going down a dirt road). Then tried a 290....way too rich. Bogging all over the place, wouldn't idle. Then a 270, which so far seems to be working out well. Plug is perfect color, idle is good.
 
Just a suggestion but it might be helpful to include all engine related mods as well so those that have porting, cranks, long rods, reeds, etc. can get a better idea of the ball park they are running at.
 
1) what carb do you have??? Stock
2) What type of aftermarket exhaust do you have? Stock
3) What type of airfilter do you have? K&N
4) What kind of air box set up do you have?? Lid on
5) What size pilot jets are you using? 32.5
6) What size main jets are you using? 230

This thread was very helpfull. Thanks!
 
1) what carb do you have??? stock

2) What type of aftermarket exhaust do you have? fatty paired with SST turbinecore2

3) What type of airfilter do you have? k&n

4) What kind of air box set up do you have?? no lid

5) What size pilot jets are you using? stock

6) What size main jets are you using? 300 (rejetting soon to 290)

7) What needle position? middle clip
 
1) what carb do you have??? 35mm pwk air stryker

2) What type of aftermarket exhaust do you have? vitos fat bastard with the 240 kit bored .040 over.

3) What type of airfilter do you have? K&n clamp on pod filter

4) What kind of air box set up do you have?? None

5) What size pilot jets are you using? 50

6) What size main jets are you using? 160

7) What needle position? Middle
 
1) what carb do you have??? 28mm Keihin PWK

2) What type of aftermarket exhaust do you have? FMF Fatty

3) What type of airfilter do you have? UNI Foam

4) What kind of air box set up do you have?? Stock airbox. Outerwears screen modified into airbox lid

5) What size pilot jets are you using? 42

6) What size main jets are you using? 145

7) What needle position? Middle
 
im haveing the same problem. my main jet is 230 and pilot is a 32.5 and 3 notch down on the needle and all my quad is back fireing and smokeing the plugs could my reeds be shot or can it be the octane of gas i am useing or the brand of oil???? plz help going nuckin futzs here
 
pablaster said:
im haveing the same problem. my main jet is 230 and pilot is a 32.5 and 3 notch down on the needle and all my quad is back fireing and smokeing the plugs could my reeds be shot or can it be the octane of gas i am useing or the brand of oil???? plz help going nuckin futzs here
Click to expand...

i found that most ppl on here are running with stock needle position which is middle or 3rd (i think), stock pilot, and a 270 main jet. but they are also running no airbox lid, stock carb, and fatty pipe
 
1) what carb do you have? Stock

2) What type of aftermarket exhaust do you have? FMF Fatty

3) What type of airfilter do you have? Vito's High Flow

4) What kind of air box set up do you have? stock box with lid removed

5) What size pilot jets are you using? stock 32.5

6) What size main jets are you using? #300

7) What needle position? stock
 
???? im lost how is going up is size going to help its runing to rich now...anouther person told me the samething and not to run it or ill fry the motor..the only outher thing i could think of is my reeds are shot and there allowing too much fule in and causeing it to back fire and foul plugs
 
STOCK JETTING IS:
PILOT:32.5
MAIN:230 mine is an 89 so 220

Please copy and paste this along with your answers in your reply, thanks.

1) what carb do you have???stock

2) What type of aftermarket exhaust do you have? stock

3) What type of airfilter do you have? k&n

4) What kind of air box set up do you have?? no lid

5) What size pilot jets are you using? 32.5

6) What size main jets are you using? 220

7) What needle position? stock
__________________

any suggestions i know somthing should be changed with the k&n air filter with no air box lid any suggestions on how drastic the main jet change should be very little or alot
 
1) what carb do you have??? OKO 30mm

2) What type of aftermarket exhaust do you have?FMF fatty/FMF Turbine core Muff

3) What type of airfilter do you have? K&N

4) What kind of air box set up do you have??None

5) What size pilot jets are you using?52

6) What size main jets are you using?155

7) What needle position? 3rd-midddle

Bogs around 3/4 to full throttle.Runs great the rest of the time!
 
1) what carb do you have??? Stock

2) What type of aftermarket exhaust do you have? FMF Gnarly With Powercore 2

3) What type of airfilter do you have? Uni Foam

4) What kind of air box set up do you have? No lid

5) What size pilot jets are you using? Stock

6) What size main jets are you using? 320

7) What needle position? 4th from top

set up for MX, so i run rich. once cleared out and warm, it rips hard!
 
1) what carb do you have??? 32 mm kehin flat slide

2) What type of aftermarket exhaust do you have? full fmf

3) What type of airfilter do you have? uni direct bolt on

4) What kind of air box set up do you have?? no air box

5) What size pilot jets are you using? ?

6) What size main jets are you using? 330

7) What needle position? one down
__________________

This is a vito's big bore +20 over w/ +3 stroker. I have an adjustable stator, boisen 2 stage reeds w/ stock reed stopper, I run 927 premixed with 91 pump gas. So where do you think I should be with everything. Any help would be great. I don't want to blow this motor up again. Thanks for you help
 
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