RE: Keeping engine clean
I mistakenly purchased a LA46 for a Sig Spacewalker II .40... the plane came out just under 9lbs AUW(!!).
Big mistake!
The LA46 ended up going into a .32 sized Extra, turning that into a wonderfully overpowered plane.
The light weight design of the LA46 let the plane balance out perfectly even though it originally called for a smaller engine.
That engine never misses a beat too.
They are great engines when properly sized for the plane they are going into.