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dirtking

2006 450f jetting

5 posts in this topic

I installed a 48 pilot jet/2 turns fuel screw out on my 2006 YZ450F today and when i rev about 1/4 throttle it misses and it still backfires on deceleration although not as bad as with stock pilot jet. Everything else on the bike is stock. Any help would be appreciated!

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You most likely need to go the other way with your pilot but some backfiring is normal. I would try a 40 or 42 pilot and lean the needle one clip and see if it does not run better. That is what we run in our area and seems ok, most of the bikes are jetted for closer to sea level end need leaned out for most everywhere else.

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My opinion is that it will be a suicide to lean out the already lean factory jetting on 06 450. 42-165 is stock and I know nobody who has gone leaner.

48-170 worked fine for me even for the hottest summer temps +30 Celsius at sea level with fuel screw adjustments only.

Richen = raise the needle one clip (needle affects from 1/4 throttle and up) and put a 170 main and adjust the fuel screw, I'd say you'll be fine. If not, you have an intake or exhaust leak or ride at high elevation.

BTW - some popping is normal. :thumbsup:

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SureBlue, do you think even in our area we would still need to richen up the bike? We are using an 06 YZ-450 until the the new ones get here and it was a dog until I put in the 40 pilot and leaned the clip. I have never jetted for sea level but in Oklahoma we are ussually to rich drom the factory, our RMZ-450 has a 38 pilot stock.

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I installed a 48 pilot jet/2 turns fuel screw out on my 2006 YZ450F today and when i rev about 1/4 throttle it misses and it still backfires on deceleration although not as bad as with stock pilot jet. Everything else on the bike is stock. Any help would be appreciated!

try a 165 or 168 mj....if it still pops try a 45pj

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