[hondasmoker2]

i have a hmf full system and i put the 180 main jet in and left the pilot alone. It ran good except for a little stumble at the 3/4 throttle so i bought a 175 main and 48 pilot, put clip pos. at 5 w/ air box removed. And it runs worse than before. + it whistles like no other 2. :evil please help.
thanxs for any advice

 

[YFZ-suprfly]

first of all... where are you???

i just have the hmf slipon so dont know how well i can help

go 45 piolet... 168-170 main.. 2 1/2 main screw.
air box lid off... is what i have

i ride with my lid on ( cause its a little quieter) but in return its a TAD rich.. makes for neat flames!

 

[hondasmoker2]

im in south eastern part of ia

 

[CK'sYFZ450]

hey i was just curious when the yfz first came out people were talking about how lite it is for a 450cc quad and had the best power to weight ratio so what is the weight of some of the yfz's after all these light weight aftermarket parts like i see in the pic of the week?? i was just curious and didnt know where to ask this question at im kinda new into this sport all over again i raced back in the mid 80s from age 5-9 with the old yamaha moto series 60cc-80cc and now i am getting my yfz next month so if anyone can answer my question , thanks :yfz