loading up/backfiring??

[Drtridr18]

Ok when i'm at low speeds(not in the wheelie rpm range??) in 2nd gear and crack it it will sound like it's loading up? and bog out, sometimes pop until i clear it out good. What's the deal with that? Also, when i rev it out and let it compression brake, not just in top gear but lower gears also, it will pop some. Any ideas? Is it rich on the mixture screw or lean on the main jet?? I dunno.

I have a Yoshi slip on, K&N power kit and filter, using Dyno-jet's 146 main as specified, stock pilot as specified, airbox lid on, mixture screw 3.5-4 turns out, richer than specified to help with past winter starting probs.

Thanks guys

First off I am assumeing that you have a 400EX.

The braking popping is from being lean or a hole in the exhaust (look close mine was hidden pretty well)

I cant say anything about the dyno jets as I hear they have their own number system? A std 146 main jet does seem a little too small for the mods you have and the fuel mix seems a little rich but that could depend on which other jets were changed etc.

[Drtridr18]

yea dynojets are def. larger than keihns