Re: Lark IV Cooling

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frankr

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Replies: 6715
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#72777

If the water temp is near freezing, the thermostat probably won’t open at all unless you run at high speed. Then it will close again when you slow down. When closed, there will be only a bit of spray out the blow hole in back. This is normal operation, even at warmer water temps.

If it put out significant spray when you first started it, I’d guess the ‘stat was stuck open, then snapped shut and worked normal. Just my guess.

Temp gauges often come with a Z-bracket to hold the sender in contact with the cylinder head. No drilling necessary. Or you could jury-rig a tee arrangement to put it in the existing port in the cylinder block that feeds the automatic choke. Actually, I’d prefer the head because that’s the hottest part.

https://www.amazon.com/Sierra-62748P-Wa … ture+gauge