Well, I doubled the oil mix on the Neptune and fired it up in the
test barrel, and learned a few things!
#1- I’m an idiot (Yesterday when I thought the throttle valve was closed, it was wide open)
#2 – When running an outboard with a 5:1 fuel mixture, the wind always switched directions,
blowing Chinese like smog in your face!
#3 – The throttle keeps working itself open if your hand isn’t on the grip. (is there suppose
to be a spring on these twins to prevent that?
#4 – The exhaust noise is objectionable after 20 minutes, when there’s no exhaust tube attached.
All said it done, it ran for twenty minutes without dying. I wouldn’t can it "smooth", but
it did idle down fair. Without a prop on, I couldn’t really do any "high speed" tuning.
I may recheck the compression for kicks to see if it’s come up any from 60 psi, after
it’s total of 25 minutes running. I’ll put the exhaust tube and prop back on and try again
when it gets nicer out. Twenty mile an hour wind and in the thirties is not my idea
of fun. The Neptune did pump water nice, and cylinders ran cool to the touch, but
of course my test tank had 1/8" of ice on it this morning!
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