Re: Are Sierra thermostats OK?

[amuller]

I am not expert on this, but when a carburetted 2-stroke engine is idling, or trolling, there are big opportunities for mixture dropout in the crankcase, etc. From this point of view, keeping the powerhead warm could make a big difference in low speed performance.

Multi-cylinder carburetted 4-stroke engines need manifold heat for similar reasons.