175 hours of operation on the engine, with 100LL has resulted in some build up on the pistons. Lack of build up would be a sign of piston overheat.

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Comment by John Marzulli on June 17, 2013 at 1:36pm

Lannie - From what I was told by the Rotax Guy \ A&P, this is a typical amount. Running 25% MoGas or alternating gas types will reduce this.

Comment by lannie stegall on June 17, 2013 at 12:35pm

Would this be the typical for a high percentage of 100LL  in the 912ULS.  I have run 239 hrs so I bet I could look like this or worse?  

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