jetting right

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Blink-182

Member

Feb 2, 2008

127

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• Feb 28, 2008

• #1

ive read guide's and everything but i still dont get it much

where do i start from
im trying to get a yz85 jetting properly for an elevation is exactly 112

it was bogging out alot when i gave it all the throttle

so i went down a clip on the jet and it smoothend out alot

any ideas on where to start i set it all to stock


i have fmf sst pipe and powercore2 silencer

running 32:1 pump gas

 

IndyMX

Crash Test Dummy

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Jul 18, 2006

5,548

2

Amo, IN

• Feb 28, 2008

• #2

You're probably going to have to lean the Pilot on that bike a couple of steps..

I did that, and added a set of Boyesen Pro Series reeds, made quite a bit of difference.

When you say you went down a clip, Did you move the clip toward the top or the bottom the the needle?

 

B

BigRedAF

Member

Jan 9, 2005

739

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• Feb 28, 2008

• #3

INDY has you going in the right direction. Pro Circuit recommends leaning the main one step and the pilot two steps with the needle in the stock location. Keep in mind that jetting is test and feel, each bike can be different.

http://procircuit.com/PCJETTING.htm

 

B

Blink-182

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Feb 2, 2008

127

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• Feb 29, 2008

• Thread starter
• #4

oh sorry i went from the first groove to the second groove at the top
so when going about half throttle to full it didnt make a braaawg noise it just picked up and hauled :eek:

 

IndyMX

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Jul 18, 2006

5,548

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Amo, IN

• Feb 29, 2008

• #5

Ok, so you leaned the needle out a bit..

I'd bet that if you dropped the pilot one or two sizes, you'll get a nice case of whiplash.

 

B

Blink-182

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Feb 2, 2008

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• Feb 29, 2008

• Thread starter
• #6

where would they have them ?

 

IndyMX

Crash Test Dummy

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Jul 18, 2006

5,548

2

Amo, IN

• Feb 29, 2008

• #7

you can get them from Motocyclecarbs.com really cheap...

I would also drop the main by 1 to start. They jet them pretty rich from the factory.

But think about getting the next 2 sizes down from stock.

FIRST THOUGH.. Open your carb, see what's in there now. It's likely stock, but.. be sure.

The sizes are stamped into the sides of the jets.

Here's a link..

http://www.motorcyclecarbs.com/Keihin_Pilot_Jet_N424-21_C81.cfm

Those are the pilot jets for the carb on the YZ85. Go with the Aftermarket Jets he sells, they're a buck cheaper, and just fine for that bike.


Here's a link to the mains..

http://www.motorcyclecarbs.com/Keihin_Main_Jet_99101-357_C77.cfm

 

H

hot125mod

Member

Jan 14, 2007

501

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• Feb 29, 2008

• #8

arent the yzs known for float height issues when they come and clean up when properly adjusted. a two stroke is usually 2 sizes on the pilot and main too rich.

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Feb 29, 2008

• #9

hot125mod said:

arent the yzs known for float height issues when they come and clean up when properly adjusted. a two stroke is usually 2 sizes on the pilot and main too rich.

Click to expand...

Not when it is freezing temperatures outside!

 

B

Blink-182

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Feb 2, 2008

127

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• Apr 2, 2008

• Thread starter
• #10

i hadent changed the jets yet but the plug looks sorta mocha brown like a rusty brown
but i got i didnt change them because i was planning on getting v force 3 reeds then jetting correctly , when i put them on the plug got tan so im guessing this is ok? ive been riding it like this for a while now. the thing is that when i give it full throttle it doesnt speed up accelerate it just kind of stops picking up speed like mid throttle i get more out of it then full throttle how do i fix that what do i have to change i was thinking about startingg with the needle , oh and indy in the manual it says going down grooves makes it richer and up groves leaner or am i reading what you said wrong ?

 

B

Blink-182

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Feb 2, 2008

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• Apr 2, 2008

• Thread starter
• #11

whenfoxforks-ruled said:

Not when it is freezing temperatures outside!

Click to expand...

its been in the 70's here up to like 79 mabye so ive been riding all winder :whoa:

 

B

Blink-182

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Feb 2, 2008

127

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• Apr 2, 2008

• Thread starter
• #12

oh and i forgot to put that it had a 48 pilot jet in it

 

whenfoxforks-ruled

Old MX Racer

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Oct 19, 2006

8,129

2

Merrillville,Indiana

• Apr 3, 2008

• #13

What is your air screw adjusted to? If you read a lot of stuff on jetting, what happened to the plug chops? You need to get the air screw-pilot set. Then fiddle with the needle, lowering the clip makes it richer. Then the plug chop on top.

 

R

Red Pinger

Member

Mar 7, 2007

19

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• Apr 4, 2008

• #14

If he mover the needle down from the top position slot #1 to the second position slot #2 he didn't lean the needle, he made it richer!!

 

B

Blink-182

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Feb 2, 2008

127

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• May 23, 2008

• Thread starter
• #15

i bought a 135 main its what they had on pro circuits site it had a 138 main and it gets hot HOT where i live is that bad? or would it run better when cold and the pilot was a 48 so i bought a 45 and 42, how long does it useally take that place to ship?