Jetting numbers...the solution

[blastard1979]

1) what carb do you have??? STOCK

2) What type of aftermarket exhaust do you have? FMF GOLD FATTY FRT AND DG SILENCER

3) What type of airfilter do you have? FOAM STOCK

4) What kind of air box set up do you have?? STOCK W/ OR WITH OUT THE LID

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

6) What size main jets are you using? 360

7) What needle position? 3RD SLOT




IVE BEEN FIGHTING THIS THING FOR A WHILE I HAVE PORTED AND POLISHED HEAD BOYSEEN REEDS ANY IDEA WHAT SIZE JET I SHOULD RUN. I LOOKED AT DYNOJET THEY SAID A 360 WITH NO AIR BOX LID AND FMF SAID 260 WITH LID. ANY HELP WOULD BE GREATLY APPRECIATED

 

[Blaaster]

/\ /\ /\ For a stock cylinder start at #280 and plug chop to correct if needed.

If you need a #360 to make it run, I would suspect an air leak, do a leak down test.

 

[Blasterr]

1) what carb do you have??? Stock

2) What type of aftermarket exhaust do you have? Full Pro Circuit

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

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

5) What size pilot jets are you using? Stock

6) What size main jets are you using? 320; High I think

7) What needle position? Stock

 

[sporty982000]

I wanted to add in.

That my relative, on his 2006 yamaha blaster, that his son races.


If some of you recall. I have mentioned he was running a 220 jet.

So today, when I stopped over to ask how the racing went in minnesota saturday.

His son got 3rd with the blaster.


He runs moose performance carb kit, and that kit, recommend the dx220 jet when using performance pipe / silencer.

So thats where the 220 came from,

I wanted to mention this, as a follow up, from when I have mentioned this the other day in some posts.

Where the fmf kit says a 260 jet and other's mention even bigger.

I am not sure what the differance is from the fmf carb / jet kit, compared to the moose one.

Sporty

 

[motoman159]

you should include your elevation to.

 

[sporty982000]

Good Idea,

Elevation for my area in illinois, is 670 feet, above sea level.

Sporty

 

[blastamasta98]

alright guys im new to 2strokes and am having more problems than i want..so here goes...


1) what carb do you have??? STOCK

2) What type of aftermarket exhaust do you have? FULL FMF FATTY FRONT TO BACK

3) What type of airfilter do you have? NOT SURE IT SAYS UNI SEEMS TO BE A 2STAGE FILTER

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

5) What size pilot jets are you using?STOCK

6) What size main jets are you using?STOCK

7) What needle position?STOCK

i recently bought the quad used and all these things were already done to it along with it being bored 20 over..i was told to rejet the carb but like i said im new to this so was looking for suggestions on what jets to use any and all help is appreciated

 

[gb blaster]

Does ur bike have the underseat air box with the lid on or off an are whales drilled in it.

Also premix or are u running the injection...
Good things to know to help with ur jetting.

An finally I would recommend taken the exhaust pipe off an checking for cylinder wear. If it was running like that it could have caused damage.

An since ur new has the bike been leak tested.

 

[Blaaster]

You require at least a #260 main jet.

 

[bbshadow49]

1) what carb do you have???
-STOCK
2) What type of aftermarket exhaust do you have?
-B1 toomey
3) What type of airfilter do you have?
-UNI
4) What kind of air box set up do you have??
- I drilled 8 holes in it
5) What size pilot jets are you using?
- STOCK
6) What size main jets are you using?
-310
7) What needle position?
-middle

I was thinking of bringing it to 290-300

Sea level Now

As i read the forums i should lower my jet size in higher elevation right?

 

[Blaaster]

Higher elevation = smaller main jet.

Lower temperature = larger main jet

And vice versa.

Plug chop to confirm.

 

[YamaZuki]

Mind you dynojet or other jet kits the Main jet numbers differ from the stock per carb brand jet sizes.

 

[YamaZuki]

Keihin, Dynojet, Mikuni Jet Size Cross Reference

All Hole Diameters Are in Inches

Hole Dia”---Keihin # -- DynoJet # -- Mikuni #
0.0350---- 92.5--------- 92----------- 86.3
0.0360---- 95----------- 94----------- 88.1
0.0370---- 97.5--------- 96----------- 90
0.0380---- 100---------- 98----------- 91.9
0.0390---- 102.5------- 100---------- 93.8
0.0400---- 105--------- 102---------- 95.6
0.0410---- 107.5------- 104---------- 97.5
0.0420---- 110--------- 106---------- 99.4
0.0430---- 112.5------- 108--------- 101.3
0.0440---- 115--------- 110--------- 103.1
0.0450---- 117.5------- 112--------- 105
0.0460---- 120--------- 114--------- 106.9
0.0470---- 122.5------- 116--------- 108.8
0.0480---- 125--------- 118--------- 110.6
0.0490---- 127.5------- 120--------- 112.5
0.0500---- 130--------- 122--------- 114.4
0.0510---- 132.5------- 124--------- 116.3
0.0520---- 135--------- 126--------- 118.1
0.0530---- 137.5------- 128--------- 120
0.0540---- 140--------- 130--------- 121.9
0.0550---- 142.5------- 132--------- 123.8
0.0560---- 145--------- 134--------- 125.6
0.0570---- 147.5------- 136--------- 127.5
0.0580---- 150--------- 138--------- 129.4
0.0590---- 152.5------- 140--------- 131.3
0.0600---- 155--------- 142--------- 133.1
0.0610---- 157.5------- 144--------- 135
0.0620---- 160--------- 146--------- 136.9
0.0630---- 162.5------- 148--------- 138.8
0.0640---- 165--------- 150--------- 140.6
0.0650---- 167.5------- 152--------- 142.5
0.0660---- 170--------- 154--------- 144.4
0.0670---- 172.5------- 156--------- 146.3
0.0680---- 175--------- 158--------- 148.1
0.0690---- 177.5------- 160--------- 150
0.0700---- 180--------- 162--------- 151.9
0.0710---- 182.5------- 164--------- 153.8
0.0720---- 185--------- 166--------- 155.6
0.0730---- 187.5------- 168--------- 1575
0.0740---- 190--------- 170--------- 159.4
0.0750---- 192.5------- 172--------- 161.3
0.0760---- 195--------- 174--------- 163.1
0.0770---- 197.5------- 176--------- 165
0.0780---- 200--------- 178--------- 166.9
0.0790---- 202.5------- 180--------- 168.8
0.0800---- 205--------- 182--------- 170.6
0.0810---- 207.5------- 184--------- 172.5
0.0820---- 210--------- 186--------- 174.4
0.0830---- 212.5------- 188--------- 176.3
0.0840---- 215--------- 190--------- 178.1
0.0850---- 217.5------- 192--------- 180
0.0860---- 220--------- 194--------- 181.9
0.0870---- 222.5------- 196--------- 183.7
0.0880---- 225--------- 198--------- 185.6
0.0890---- 227.5------- 200--------- 187.5

 

[YamaZuki]

i wish the list went higher in numbers

 

[slickerthanyou]

My 33pwk and 35PWK air striker like the same jetting but different needles. This is on my stroked +3, vforce 3, toomey ceramic coated exhaust, aluminum air box uni filter, triple exhaust ported for +3 and head rechambering and shaved. 155psi, no air leaks!

35mm-

 

[cmblaster]

Stock carb.
twin air foam
fmf fatty with powercore 2
Pilot 32
Main 340

 

[Blasting]

Stock carb.
twin air foam
fmf fatty with powercore 2
Pilot 32
Main 340

Stock carb..FMF Turbine Core 2..Main 320..Can't remember the pilot and I don't feel like dissasembling it again

 

[01blastingwv]

1) what carb do you have??? STOCK

2) What type of aftermarket exhaust do you have? Fmf slip on

3) What type of airfilter do you have? Uni

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

7) What needle position?STOCK

 

[Croozer]

i got a 2000 blaster, EVERYTHING is stock, if i get a FMF fatty and powercore 2, what would my jets haveto be to get FULL performance out of it?

 

[Awk08]

i got a 2000 blaster, EVERYTHING is stock, if i get a FMF fatty and powercore 2, what would my jets haveto be to get FULL performance out of it?

leave the pilot jet and needle alone, start with a 290/300 main jet and plug chop it to confirm...lean/correct/rich
go up or down accrording to what the plug color tells you, (prolly down near 270/280)

plug chops, the only way to know for sure.......

http://www.blasterforum.com/carburetor-138/how-plug-chop-53237/