Common OEM Part Numbers

Things to remember...

Yamaha Parts Fiche Website

Yamaha Jet Part Numbers

MAIN JET

4MX-14943-88-00 .JET, MAIN (#152) AP 1

4MX-14943-38-00 .JET, MAIN (#155) AP 1

4MX-14943-89-00 .JET, MAIN (#158) AP 1

4MX-14943-39-00 .JET, MAIN (#160) AP 1

4MX-14943-90-00 .JET, MAIN (#162) AP 1

4MX-14943-40-00 .JET, MAIN (#165) STD 1

4MX-14943-91-00 .JET, MAIN (#168) AP 1

4MX-14943-41-00 .JET, MAIN (#170) AP 1

4MX-14943-92-00 .JET, MAIN (#172) AP 1

4MX-14943-42-00 .JET, MAIN (#175) AP 1

4MX-14943-93-00 .JET, MAIN (#178) AP 1

PILOT JET

4MX-14948-01-00 .JET, SLOW (#35) AP 1

4MX-14948-02-00 .JET, SLOW (#38) AP 1

4MX-14948-03-00 .JET, SLOW (#40) AP 1

4MX-14948-04-00 .JET, SLOW (#42) AP 1

4MX-14948-05-00 .JET, SLOW (#45) STD 1

4MX-14948-06-00 .JET, SLOW (#48) AP 1

4MX-14948-07-00 .JET, SLOW (#50) AP 1

STARTER JET

3TJ-1494F-12-00 .JET (#62) AP 1

3TJ-1494F-13-00 .JET (#65) STD 1

3TJ-1494F-14-00 .JET (#68) AP 1

3TJ-1494F-15-00 .JET (#70) AP 1

3TJ-1494F-16-00 .JET (#72) AP 1

3TJ-1494F-17-00 .JET (#75) AP 1

3TJ-1494F-18-00 .JET (#78) AP 1

3TJ-1494F-19-00 .JET (#80) AP 1

3TJ-1494F-20-00 .JET (#82) AP 1

LEAK JET

4JT-1494F-01-00 .JET (#35) AP 1

4JT-1494F-03-00 .JET (#40) AP 1

4JT-1494F-07-00 .JET (#50) STD 1

4JT-1494F-11-00 .JET (#60) AP 1

4JT-1494F-15-00 .JET (#70) AP 1

4JT-1494F-19-00 .JET (#80) AP 1

4JT-1494F-23-00 .JET (#90) AP 1

4JT-1494F-27-00 .JET (#100) AP 1

Fuel Screw Parts

O-RING: 3TJ-14562-40-00

WASHER: 3TJ-14952-40-00 WASHER

COIL, SPRING: 3TJ-14160-40-00 COIL, SPRING

'03+ YZ Exhaust Cam: 5TA-12180-00-00

'03+ WR Exhaust Cam: 5TJ-12180-10-00

YZ Throttle Stop Screw (39MM Keihin): 5JG-14591-00-00

Water Pump Part Numbers

IMPELLER SHAFT : 5GR-12458-00-00

OIL SEAL : 93109-11073-00

OIL SEAL,SD-TYPE : 93102-12321-00

BEARING : 93306-00105-00

GYT-R AIS Kits

'05-'06 : GYT-5TJ93-69-00

'07+ : GYT-5TJ93-69-01

Where to buy this stuff:

TT Store

Sudco (Jets)

Bike Bandit

Zanotti's

Bookmark this stuff...SC

SC are you going to make this a sticky?

Nope, it's included in the Performance Index already :worthy:...SC

Where's the 2 PAJ's?

I have an 03 450. What is my stock main jet. I bumped mine up to a 168. I ride at 4000ft here in Moab. from 50 to 100 degrees. I removed the baffle on my stock exhaust and opened up the airbox along with the free mods. Any suggestions for the jetting, I have a slight hesitation right off idle and it seems a little choked on the very top. Mid range seems strong. Any help will be appreciated. This is my first 4 stroke after years of 2 strokes.

Things to remember...

Yamaha Parts Fiche Website

Yamaha Jet Part Numbers

MAIN JET

4MX-14943-40-00 .JET, MAIN (#165) STD 1

Good info. Interesting, my Canadian 04 WR450 came stock with a 160 main jet.

On 11/27/2006 at 7:20 PM, clark4131 said:

Things to remember...

Yamaha Parts Fiche Website

Yamaha Jet Part Numbers

MAIN JET

4MX-14943-88-00 .JET, MAIN (#152) AP 1

4MX-14943-38-00 .JET, MAIN (#155) AP 1

4MX-14943-89-00 .JET, MAIN (#158) AP 1

4MX-14943-39-00 .JET, MAIN (#160) AP 1

4MX-14943-90-00 .JET, MAIN (#162) AP 1

4MX-14943-40-00 .JET, MAIN (#165) STD 1

4MX-14943-91-00 .JET, MAIN (#168) AP 1

4MX-14943-41-00 .JET, MAIN (#170) AP 1

4MX-14943-92-00 .JET, MAIN (#172) AP 1

4MX-14943-42-00 .JET, MAIN (#175) AP 1

4MX-14943-93-00 .JET, MAIN (#178) AP 1

PILOT JET

4MX-14948-01-00 .JET, SLOW (#35) AP 1

4MX-14948-02-00 .JET, SLOW (#38) AP 1

4MX-14948-03-00 .JET, SLOW (#40) AP 1

4MX-14948-04-00 .JET, SLOW (#42) AP 1

4MX-14948-05-00 .JET, SLOW (#45) STD 1

4MX-14948-06-00 .JET, SLOW (#48) AP 1

4MX-14948-07-00 .JET, SLOW (#50) AP 1

STARTER JET

3TJ-1494F-12-00 .JET (#62) AP 1

3TJ-1494F-13-00 .JET (#65) STD 1

3TJ-1494F-14-00 .JET (#68) AP 1

3TJ-1494F-15-00 .JET (#70) AP 1

3TJ-1494F-16-00 .JET (#72) AP 1

3TJ-1494F-17-00 .JET (#75) AP 1

3TJ-1494F-18-00 .JET (#78) AP 1

3TJ-1494F-19-00 .JET (#80) AP 1

3TJ-1494F-20-00 .JET (#82) AP 1

LEAK JET

4JT-1494F-01-00 .JET (#35) AP 1

4JT-1494F-03-00 .JET (#40) AP 1

4JT-1494F-07-00 .JET (#50) STD 1

4JT-1494F-11-00 .JET (#60) AP 1

4JT-1494F-15-00 .JET (#70) AP 1

4JT-1494F-19-00 .JET (#80) AP 1

4JT-1494F-23-00 .JET (#90) AP 1

4JT-1494F-27-00 .JET (#100) AP 1

Fuel Screw Parts

O-RING: 3TJ-14562-40-00

WASHER: 3TJ-14952-40-00 WASHER

COIL, SPRING: 3TJ-14160-40-00 COIL, SPRING

'03+ YZ Exhaust Cam: 5TA-12180-00-00

'03+ WR Exhaust Cam: 5TJ-12180-10-00

YZ Throttle Stop Screw (39MM Keihin): 5JG-14591-00-00

Water Pump Part Numbers

IMPELLER SHAFT : 5GR-12458-00-00

OIL SEAL : 93109-11073-00

OIL SEAL,SD-TYPE : 93102-12321-00

BEARING : 93306-00105-00

GYT-R AIS Kits

'05-'06 : GYT-5TJ93-69-00

'07+ : GYT-5TJ93-69-01

Where to buy this stuff:

TT Store

Sudco (Jets)

Bike Bandit

Zanotti's

Bookmark this stuff...SC

The image below is a screen grab of your original post...is it meant to be 1) only exhaust cams? (vs intake/exhaust)  and 2) part # for YZ and WR. (rather than both YZ part number)

Screen Shot 2017-03-08 at 2.19.27 PM.png

On 3/8/2017 at 11:22 AM, kevvyd said:

The image below is a screen grab of your original post...is it meant to be 1) only exhaust cams? (vs intake/exhaust)  and 2) part # for YZ and WR. (rather than both YZ part number)

Screen Shot 2017-03-08 at 2.19.27 PM.png

Are we asking a guy that posted 11 years ago are we. :smashpc: 

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