The Tower 46 is a bit finicky at first. It really doesnt
run that well until broken in. And break in takes a while.

My experience has been that you need a fairly rich setting
on the high speed needle and a fairly lean setting on the idle.
The needles interact somewhat so expect to do some tweaking.

More nitro is not the answer. In fact this motor seems to prefer
lower nitro. And I did not have good luck at all with the Tower
plugs. They are supposed to be the same as an OS 8 but the
46 we had did not like them at all. We had much better results
with a Fox idle bar plug.

This engine leans out a LOT in the air. So you need to have
it running pretty rich on the ground. 300 or 400 off peak is
probably not rich enough. Dont expect much until you get
a gallon or so through it. I would recommend some bench running.

Mike Hammer