Derek,


You're using too much nitro.

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REQUIRES: Glow starter, fuel with 5%-15% Nitromethane and 18% oil content,
2.5mm ball wrench to tighten muffler screws (can use GPMR8012).

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This is the [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXALM2&P=RF]Tower web page[/link] for this engine.

When all else fails RTFM...

This may not be causing your immediate problem, but it may destroy your engine, nonetheless, unless you added two head shims to the one already there (not the washer under the plug).

If the new synthetic oil in CoolPower has too much extreme pressure additive, it may prevent your plug and washer from locking on the seat.