Yfz450 dies

I just got an 07 yfz450. It runs good, if i rev it, its fine but if i barely bush the throttlw slowly it seems to die at 1/8 throttle. If i gove it a quick rev its fine but as soon as i push the throttle in a tiny bit less than 1/4 it dies. Is that because my idles too low? Is it a fuel air mixture problem?

Forgot to mention. If im putting down the road barely touching the gas it wants to die but wont because im still rolling. It idles and revs anywhere over 1/8 throttle maybe 1/4 throttle but anywhere below that it cuts out. .

My 08 does same thing but usually only if you go from low rpm and try to punch it. I put next size up jets in it and it helped some but didn't fix the problem.

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