Novarossi.
The new 21R 2010 is an excellent engine. I've been speaking to a lot of customers and this engine is rated very highly. Your getting very similar performance to the higher end Novarossi's (Plus 4 for example).
For the money you really cannot go wrong with it. It'll be easy to break in, tune and the reliability is like nothing else I found. Also, a few people from our track get 12+ minutes runtime out of it with ease.
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