Jetting numbers...the solution

[Gnorris]

Just picked up this 04 im having trouble getting the main jet dailed in..im at 6000 ft elevation..not sure if it's bored over but rebuilt recently. Stock reeds
what carb do you have???
Stock
2) What type of aftermarket exhaust do you have?
Full fmf , fatty gold series and powercore 2 silencer
3) What type of airfilter do you have?
K&n
4) What kind of air box set up do you have??
Stock lid off
5) What size pilot jets are you using?
Stock
6) What size main jets are you using? 240 and it Boggs and won't get on the pipe.?
7) What needle position? Last groove. Leanest I believe.?

 

[Gnorris]

Just picked up this 04 im having trouble getting the main jet dailed in..im at 6000 ft elevation..not sure if it's bored over but rebuilt recently. Stock reeds
what carb do you have???
Stock
2) What type of aftermarket exhaust do you have?
Full fmf , fatty gold series and powercore 2 silencer
3) What type of airfilter do you have?
K&n
4) What kind of air box set up do you have??
Stock lid off
5) What size pilot jets are you using?
Stock
6) What size main jets are you using? 240 and it Boggs and won't get on the pipe.?
7) What needle position? Last groove. Leanest I believe.?

 

[Larry's Shee]

Just picked up this 04 im having trouble getting the main jet dailed in..im at 6000 ft elevation..not sure if it's bored over but rebuilt recently. Stock reeds
what carb do you have???
Stock
2) What type of aftermarket exhaust do you have?
Full fmf , fatty gold series and powercore 2 silencer
3) What type of airfilter do you have?
K&n
4) What kind of air box set up do you have??
Stock lid off
5) What size pilot jets are you using?
Stock
6) What size main jets are you using? 240 and it Boggs and won't get on the pipe.?
7) What needle position? Last groove. Leanest I believe.?

Have you done a plug chop? You might consider a leaner needle and/or pilot. Call Carb parts Warehouse, Jets R Us, or Sudco for recommendations for needle. Pilot would just be next size down.

IIRC pilot is idle to 1/4-3/8 throttle opening. Needle is 3/8-5/8 3/4 throttle opening.
Realize that ALL circuits overlap to where pilot/air screw actually have a slight effect on full throttle.
Talking to the carb parts suppliers should help a lot. Be sure to stress you are at high elevation.

 

[Larry's Shee]

Also you might have to even change things like slide or emulsion tube.

Do you know how to do a proper plug chop? You also can do part throttle plug chop.

 

[Gnorris]

Also you might have to even change things like slide or emulsion tube.

Do you know how to do a proper plug chop? You also can do part throttle plug chop.

Have never done a plug chop..i will look into the next size down needle.

 

[Gnorris]

Have watched videos on plug choping. Still unsure about what color I'm looking for and burn ring position?

 

[Larry's Shee]

The smoke ring is down by where the ceramic insulator meets the steel body. You want a cardboard brown or slightly darker color.

If you get an illuminated magnifying glass/lope you can just read the plug without actually cutting it.

 

[Blasterfan9182]

this could help out alot of members if this takes off.
and hopefully this will help alot of the newbies...
I:IblasterforumI:I

STOCK JETTING IS:
PILOT:32.5
MAIN:230

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

1) what carb do you have???
stock mikuni, just rebuilt
2) What type of aftermarket exhaust do you have?
BM
3) What type of airfilter do you have?
not sure, looks modified but not sure, no airbox lid
4) What kind of air box set up do you have??
no lid
5) What size pilot jets are you using?
no idea. how do i find out?
6) What size main jets are you using?
360 from dynojet kit
7) What needle position?

the position the dynojet kit referred me to. its in the middle somewhere

 

[Michael11]

1) what carb do you have?
Stock mikuni

2) What type of aftermarket exhaust do you have?
Dg full fatty pipe exhaust

3) What type of airfilter do you have?
Dual stage foam. No name

4) What kind of air box set up do you have?? Drilled lid

5) What size pilot jets are you using?
Stock
6) What size main jets are you using?
Stock
7) What needle position?
Middle between lean&rich

 

[Michael11]

what needle slot? should be added

1) what carb do you have???
Stock mikuni
2) What type of aftermarket exhaust do you have?
DG full exhaust
3) What type of airfilter do you have?
Dual stage foam
4) What kind of air box set up do you have??
Lid has holes drilled in it

5) What size pilot jets are you using?
Stock
6) What size main jets are you using?
Stock
7) What needle position?

3rd position

 

[Tiffany Emory]

1) what carb do you have???
mikuni vm 26mm

2) What type of aftermarket exhaust do you have?
fmf fatty header (heatwrapped) & unbranded dirtbike silencer

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

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

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

6) What size main jets are you using?
Stock 230

7) What needle position?
middle

Wiseco Top end
Boyson Reeds
32:1 Klotz Techniplate

 

[STurnerXM2010]

1) what carb do you have???
Stock

2) What type of aftermarket exhaust do you have?
FMF SST with FMF Turbo2

3) What type of airfilter do you have?
Aftermarket dual element

4) What kind of air box set up do you have??
Lid off

5) What size pilot jets are you using?
32.5 for now; reevaluating air mixture screw and may need to go down to a 30.

6) What size main jets are you using?
310 currently; plug chop sequence not completed since latest modifications

7) What needle position?
Middle

**Additional Mods worth noting: lightly ported cylinder (all exhaust porting, polishing only on intake), Boydstun reeds and cage, decked head .010.**

 

[Brandon Taylor]

this could help out alot of members if this takes off.
and hopefully this will help alot of the newbies...
I:IblasterforumI:I

STOCK JETTING IS:
PILOT:32.5
MAIN:230

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

1) what carb do you have???

2) What type of aftermarket exhaust do you have?

3) What type of airfilter do you have?

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

5) What size pilot jets are you using?

6) What size main jets are you using?

7) What needle position?

1) what carb do you have??? Stock 26mm Mikuni

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

3) What type of air filter do you have? 42mm pod off of carb with a 4' tube with a bend in between

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

5) What size pilot jets are you using? 35

6) What size main jets are you using? 310

7) What needle position? 3rd

 

[Nathan Grider]

this could help out alot of members if this takes off.
and hopefully this will help alot of the newbies...
I:IblasterforumI:I

STOCK JETTING IS:
PILOT:32.5
MAIN:230

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

1) what carb do you have??? Mikuni 26mm

2) What type of aftermarket exhaust do you have? Fmf fatty gold/ power core 2

3) What type of airfilter do you have? Foam hi flo

4) What kind of air box set up do you have?? Stock air box vented.

5) What size pilot jets are you using? 32.5

6) What size main jets are you using?260

7) What needle position? 3rd from top.
Also running a 68mm bore

 

[Nathan Grider]

what carb do you have??? Mikuni 26mm

2) What type of aftermarket exhaust do you have? Fmf fatty gold with power core 2

3) What type of airfilter do you have? Foam hi flo

4) What kind of air box set up do you have?? Stock vented.

5) What size pilot jets are you using? 32.5

6) What size main jets are you using? 260

7) What needle position? 3rd from top

Also have a 68mm bore .

 

[Cheese98]

1) what carb do you have???
Stock
2) What type of aftermarket exhaust do you have?DG pipe fmf silencer

3) What type of airfilter do you have?
High flo air filter from the zon
4) What kind of air box set up do you have??stock

5) What size pilot jets are you using?
32.5
6) What size main jets are you using?
300
7) What needle position? Middle