25 merc


Old 08-02-09, 06:54 AM
Thread Starter
Join Date: Jul 2009
Location: michigan
Posts: 12
25 merc

hello i have either a 1987 or 1988 tiller model merc outboard.
does anyone know if these have thermostats ?
because my repair manual shows absolutley nothing on thermostats, or replacement.
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Old 08-02-09, 05:49 PM
Join Date: Jul 2008
Location: Montgomery MN
Posts: 541
I'll take a look tomorrow I have been out of town, another thing to check is the pop off valve. If it sticks shut it will cool while at idle but won't let enough water through the powrehead at full throttle.

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