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Old 09-11-2018, 07:27 PM
Welcome To ATM
Join Date: Sep 2018
Last Online: 09-11-2018 07:27 PM
Location: Indiana
Posts: 1
Default 2018 yz250


Hello all ! This is my first 2 Stroke and Iím learning the Jetting procedures. I bought a new 2018 yahama 250 and wondering if the jetting from the factory will work well. Iím at 800 Feet and in the Midwest. Thanks
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Old 09-12-2018, 08:55 AM
cowboyona426's Avatar
Join Date: Feb 2003
Last Online: Today 09:47 AM
Location: Newport, WA, USA
Posts: 9,591

They usually come jetted for sea level so you should be in good shape. Your local dealer may have some insight on what has been working well for others in your area. Enjoy that new scooter and welcome to ATM.
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Old 09-12-2018, 02:51 PM
OlSchoolFool393's Avatar
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Join Date: May 2004
Last Online: 09-12-2018 03:12 PM
Location: Texas
Posts: 1,435

Congrats on the new yz
Have the same bike 2019 yz 250
Jetting should be ok ,had to change my pilot to #50 from stock #51 now bike idles good and pulls good all ranges.
I am. Only mxing so making changes for that went 51 tooth rear from 50 to jelp pull in bottom to mid ,bikes will not runout of top end
If you are on top of 5 gear ,you are on one loong sttaight or just too famn fsst.
Just installed hr meter and vforce 3 reeds
Made throttle smoother and crispy
Had to respring for 200lb rider ,front springs real soft ,from factory
Regrease all chasiss as soon as possible
Factories use very lite and very little grease.
My blke has 3.9 hrs and have regreased complete chassis
Yamaha has a good manual with bike read it
And you will learn alot about bike....enjoy
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