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hemi400ex
04-25-2007, 08:17 PM
popping from the exhaust when i go from WOT to letting off the gas abit does that mean its to lean or to rich 2007 hmf slip on (no quitecore) , k&n, lid on, 71, 152 main, 42 pilot, needle on 3rd from top, hills of WV or could have not haveing a quitcore in it be the problem too

400eXr1d3rZ
04-25-2007, 08:25 PM
You have near perfect jetting, mess around with your fuel screw, 2 1/4 turns should be a starting point.

hemi400ex
04-25-2007, 08:58 PM
it is right now but i lost the damn fuel screw tool i bought so when i get a new one i will thanks

redexrider
04-25-2007, 09:02 PM
Fuel screw tool??? you mean a Common screwdriver??

n811
04-25-2007, 09:02 PM
the only time I get "popping" is when its really backfiring. Might have a air leak somewhere in the exhaust or intake.

hornetgod13
04-25-2007, 11:12 PM
Originally posted by redexrider
Fuel screw tool??? you mean a Common screwdriver??

2005 and Newer 400EXs have a "D" shaped fuel screw.

400eXr1d3rZ
04-25-2007, 11:18 PM
Get some tweezers and try turning it, or a tiny pair of pliers, or even get a dremel and grind a straight line through it so you can just both screwdriver and the D shaped fuel screw tool.

hornetgod13
04-26-2007, 08:44 AM
DynoJet sells the "D" shaped tool for $3.00. The part number is DT008. You'll have to call them directly to order it.

hemi400ex
04-26-2007, 03:28 PM
Originally posted by hornetgod13
DynoJet sells the "D" shaped tool for $3.00. The part number is DT008. You'll have to call them directly to order it.

Thanks should i turn my fuel screw in or out to cut out the popping

400eXr1d3rZ
04-26-2007, 03:44 PM
Originally posted by hemi400ex
Thanks should i turn my fuel screw in or out to cut out the popping

I say you should richen it up a bit, so turn it out.

hornetgod13
04-26-2007, 03:50 PM
Originally posted by hemi400ex
Thanks should i turn my fuel screw in or out to cut out the popping

"Popping" would indicate a lean condition. Turn the fuel screw out in 1/4 turn increments until it improves.