HYMMM, Going by my experiance's with new 170's, I have found them to be too rich on the reg, and thats at bieng flush on the reg, and to get to 4000 is a problem.
Every 170 I have run so far finishs up bieng about 1 turn in on the reg.

Not hearing the sounds and having heaps of fuel, I think there is a possability of a bent con rod, I would get some expert advice in your area,
or return it for service.

YS SERVICE AUSTRALIA