I used my 12-3SCT at the Motonica GP race this past weekend. This is my first Novarossi engine.

I put a quart of Trinity break-in fuel through it first (a few tanks at idle then running it on the track very rich). Between tanks I let it cool. By the end of the day I switched to my race fuel which is Werks 30%.

I got advice from Novarossi USA and Garen at the track that it's OK to not add shims for 30% unless I lose plugs (which I have not). So I didn't...

Day 2 and 3, the engine ran great. It never stalled, always started easily, and I ran it around 210. It felt a bit rich and I knew I could lean it but I want a long life from this engine so I'm taking it easy. Even at these settings, the engine was strong and well worth my money.