bog with HMF at 1/4 throttle...

[2001400exrider]

rite at 1/4 thorttle everytime it has a quick bog or looses powa fora sec and it doesnt seem like good gains under 1/4 thortle. i think i need a larger pilot jet like a 42 pilot? would this make the differnce? my plug is perfect tan color rite now, will a 42 pilot make any differnce to my plug color?

[04'400ex'er]

you need a 42 pilot. when you say your plug is a perfect tan color, did u test it at 1/4 throttle or wot? I wouldnt waste time testing it at 1/4 before you change pilot, just put the 42 in and see how she does. if you still have a lag then do a check.