CONTINUOUSWAVE

A little more research reveals it may very well be the poppet valve per the shop manual OG960500 and above, Pg 4B-7 , Poppet valve controls water flow at high RPM, If poppet valve is stuck open at low RPM, the engine will not reach the proper operating temperature (run cold), and will run rough at i...

The new thermostat lists for $108, Mercury suggested if I remove it check it by placing it in hot water to see if it closes. Not urgent since it runs in normal temperature range 120-125 while in use.

Yes , I will replace or swap out the thermostat. That seems like the logical thing to do.

Jimh--thank you for the comprehensive response--very helpful.

i will report back.

Thanks
Tates 2

I have twin 2002 Mercury OptiMax200-HP engines on a Revenge 25. The engine have 580-hours. I have checked these two engines and found a large discrepancy [in the time needed for engine warm up] between them. The port Optimax 200 engine idles at 560-RPM, and its temperature goes to 100-degrees-F from...

I finally got a new fuel tank pickup installed after a long delay. The time was consumed in two ways: ⋅ the Philips head screws on pickup plate took a couple of weeks to remove, and four of the eight screws were stripped, I can't imagine it was installed new that way. I had to use penetrat...

A3: I have run the engine on auxiliary tanks and can get full throttle no problem. A2 and A4: I have changed the fuel-water separator filters, the fuel lines, and (today) the vent line. I checked the vent fitting with compressed air. I don't see a problem with any of those. I probably should run the...

Q1: Has anyone replaced the fuel pickup on [the internal 142-gallon Florida Marine Tank fuel tank on] a classic Boston Whaler boat? Any tips [from your experience at replacement of the fuel tank pickup on a 142-gallon Florida Marine Tank] would be helpful and greatly appreciated BACKSTORY: My 30-yea...

Whaler Drive Hardtop, Twin 200 Optimax engines, 2002 year, bought new in 2004 ,550 hrs.
1999 Two axle Aros Zinc Epoxy Trailer good condition, boat & trailer= $29,500
Located in Ventura Ca.
Contact info. pfsea@aol.com