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biggun132
12-02-2009, 01:45 PM
when my bike is cold and warming up it seems like it is backfiring threw the carb or something. could this be from my jetting being off? any help?? also what do yall think about the edelbrock carbs?
inlinepwr
12-02-2009, 02:11 PM
mine does the same thing. i'll follow the thread for some suggestions.
slightlybent47
12-02-2009, 02:31 PM
Dose it do it when it’s wormed up?
biggun132
12-02-2009, 03:44 PM
no it stops after warm.
biggun132
12-03-2009, 08:49 AM
no body has any idea???
nastyrider17
12-03-2009, 01:05 PM
How can you tell if it's backfiring through the carb? I think mine might be doing the same.
MidnightBlade
12-03-2009, 06:22 PM
its just the cold 400ex they are cold blooded put size 56 pilot jets in and it all goes away i did it to mine and it only does it a little now
biggun132
12-03-2009, 08:21 PM
a 56?!?!?! wow
slightlybent47
12-04-2009, 01:39 AM
Just warm it up a bit before you ride, you should be fine. If it's in the 30's-40’s mine starts good but needs to warm up a minuet or two, then it runs fine.
biggun132
12-04-2009, 09:52 AM
ok... the reason i was worried is because i have two 400's and only one does that i didnt know if the jetting was off or something.
slightlybent47
12-04-2009, 10:52 AM
Originally posted by biggun132
ok... the reason i was worried is because i have two 400's and only one does that i didnt know if the jetting was off or something.

Are both of them the same? Stock? Mods?
biggun132
12-04-2009, 12:52 PM
well basically. one dont have a choke and i put the 42 pilot with a full exhaust. and the other just has a hmf slipon both with no lids
katch26
12-04-2009, 01:15 PM
well jetting or timing.....both will cause it to backfire
MidnightBlade
12-04-2009, 03:23 PM
what is the stock pilot size?
katch26
12-04-2009, 05:26 PM
Originally posted by MidnightBlade
what is the stock pilot size?

38....you can see why a 56 can raise some eyebrows
MidnightBlade
12-04-2009, 05:54 PM
sorry its a 46 i knew it was about 8 or 10 over but anyway they help alot
tywebb3
12-04-2009, 07:40 PM
I was fighting the same thing recently on my stock '05. The previous owner removed the stock spark arrestor and installed a billet tip but that was all that was done. It ended up liking a 42 pilot, 150 main, and 2 1/4 turns out on the pilot screw. I am guessing you would have to go bigger on your main considering you have a slip on.