Originally Posted by Över

I have run about 2 gallons with it, but it has been like this since new.
I run 25% nitro, i have not checked the shims, have never heard about that.
I use 6.5mm venturi.
The problem is that the engine not hold the tune, 5 lap its fine next to rich then lean, fat, perfekt...
I have 2 toro neros and i have tuned them earlier exactly the way you say and they runs perfekt, only needs a fine tune some times.