my 2006 yfz 450 die when i open throttle quickly
very bad response !!!
so if i open throttle slowly or normaly no problem ! and it run very well.

45 pilot
170 main
4 clip
no air box lid
pro circuit t4 pipe
yz exhaust cam timing

what my problem ??
thamk you
jim  

when you give it full throttle quickly does it cut out or bog down?

if it cuts out the fuel mixture is too lean.

if it bogs down the fuel mixture is too rich.

turning the fuel/air screw to the left increases the amount of fuel.
turning it to the right decreases the amount of fuel.  

yesterday i try different pilot...42-45-48-50 and 55
needle at 1st-2-3-4-5-6-7 slot
fuel/air mixture 1/4-1/2-3/4-1.....3 1/2

my atv always die when i quickly open full throttle !
this carb have an accel pump...it can be this ????

sorry if my english is bad i'm french !

thank you
jim  

it could be the accel pump.

but more likely it is the fuel/air mixture.  

if you are in the chattanooga tennessee area bring it by and i'll see if i can't get it tuned in for ya.  

thank you for your reply.im not in tennessee im in quebec canada about 5 or 6000 km from you ! haha

this week i'll try some different accel punmp jet and i'll see if it can fix the problem.

thank...
jim