First gear chop

07 yz450f

Im not sure if it did it while warmed up after a few laps but on my way out to our track i notice that when idling down the street my first gear is real choppy and kinda misses a little. Anyone experience this? I have about 5 hrs on a new wiseco top end and i also checked and shimmed my valves to the called for clearances when i did the top end.

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