RE: Engine Knocking
Stamey,
By all likelihood, there is ABSOLUTELY NOTHING wrong with your engine.
Tower engines are particularly tight at TDC and this may make normal clearances; between the piston and the wrist-pin, between the wrist-pin and the con-rod and between the con-rod and the crank-pin; more audible; especially when there is a relative lack of fresh oil.
You are just giving us a scare...
Using fuel with a lot of castor oil, do the break-in as described [link=http://www.rcuniverse.com/forum/m_1850473/tm.htm]in this elaborate thread[/link].
When a two-stroke engine is running normally (i.e. two-cycling, firing on every revolution), the con-rod is ALWAYS under compression and the relative movement between those parts is minimal and inaudible.
All engines have these same clearances and particular high-performance engine have even larger clearances. Yet this bothers absolutely no-one.
None of them make any unusual mechanical noise while running.
Just run your engine, lean it to a rich two-cycle setting and see.