www.iFourWinns.com

While running the boat during pre-season checks the thermostat finally seems to be working properly (pulled some old rubber impeller bits out of it) and it gets right up to temp and holds at 160. One riser is hotter than the other, about 10 degrees is all according to the IR thermometer. Indication of anything to worry about or probably normal.

The poor search function on this forum helps explain many of my simple questions.

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Jon Miller
1998 four Winns Horizon H200
Volvo Penta 4.3 GL
Newtown, CT

untitled-545 by millerjont, on Flickr

Its not uncommon for one to be a bit hotter than the other. Its more important to check them in the water under normal operating conditions. I leave an IR temp gun on the boat and check them every so often. At idle they are usually 90-100 or so. Running the boat, after coming off plane they will hit about 125-130 or so. They will cool back down to 100 or so after idling for about 5 min. If I get higher readings (like 125-135 at idle, or 160 after running on plane) something is wrong, and I go looking for the problem.

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88 Four Winns 200 Horizon
4.3 OMC Cobra-4bbl
2002 Walker Bay 10/2012 Suzuki 2.5
2008 Walker Bay 8

1998 Jeep Grand Cherokee 4.0/Selectrac
2007 Jeep Grand Cherokee 5.7 Hemi/Quadradrive II

<edit>
Beaten by LouC!

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2011 Four Winns H180 SS.
Aussie built Mustang 2800.
SOLD - 1997 Four Winns Horizon RS

Thank you gentleman.....was what I was hoping (and expecting) to here

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Jon Miller
1998 four Winns Horizon H200
Volvo Penta 4.3 GL
Newtown, CT

untitled-545 by millerjont, on Flickr

Quite often one riser has an additional cooling water inlet that comes from a fuel cooler so it in effect gets extra cooling water , rather than just the hot water from the manifold.. Both my EFi engines had it (on the port riser, mounted low down), that riser always ran cooler than the starboard one.