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Jetting Help!

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2003 yz250f at 0-100ft sea level... I can't get the response I want out of the gate it has a bog I cant get out of it, anyone have a setup up for the low sea level Im at or a direction I should go as to go leaner or richer. I've done the oring mod and gone down to a 70 leak jet from 100 stock.

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Hi MHenry910,the info posted in the link by kah Ran Nee is the answer,you need to study this,maybe print a copy,order your parts & take some action.this will fix the bog and go some way to tune the carb,good luck.

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I got rid of the bog it was the float height... Now it idles great and rev's great on the stand but when I start riding it has a hesitation all the way to about 1/2 throttle then it takes off and it seems to get worst the hotter it gets and if it cuts off it hard to start but super easy when cold... I know the needle would have something to do with the hesitation but I also think It could be the stator or something to do withe the ignition system maybe??? Can anyone tell me how to test the ignition system???

 

pilot 42

needle OBELP (stock)

needle clip 4th from top (stock)

main 178 (stock)

leak jet 70

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I got rid of the bog it was the float height... Now it idles great and rev's great on the stand but when I start riding it has a hesitation all the way to about 1/2 throttle then it takes off and it seems to get worst the hotter it gets and if it cuts off it hard to start but super easy when cold... I know the needle would have something to do with the hesitation but I also think It could be the stator or something to do withe the ignition system maybe??? Can anyone tell me how to test the ignition system???

 

pilot 42

needle OBELP (stock)

needle clip 4th from top (stock)

main 178 (stock)

leak jet 70

Your Yamaha Service (not owners) Manual explains it all

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I fixed it I raised the needle 1 position and took a ride, it was horrible just as bad as before. Then I stopped cut it off and unplugged the TPS and bomb it runs great, very small hesitation but now that I know the cause I will order the JD jet kit I've already done the oring mod. 

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