yfz 450 cutting out.

[Grant1699]

i just put on a full sys big core sparks pipe and tps bypass. now it like cuts out at about half throttle. any help?

jetting
175
NCVQ needle 4th from top
45
2.5 turns out on fuel screw

mods
K&N
lid off

I live in Kansas (elevation?) temp. 80-100

o i just remembered idk if it matters but it wont run if i have the choke on like to start it.

thanks,

Grant

[250rmike]

does it cut out or does it sputter

[atvrider23054]

sounds like the jetting is off. I would go down in the main jet

[John451]

Lol one of my customers had the same problem.... Turns out he hadda paper towell sucked into his carb lol. try runnin it without a filter, it migt be clogged.

[ohsobad_chevy]

Too rich on the main, put in a 170 and try that.