Twin Tohatsu's with same high end Rpm end loss

R

rockroussel

Recruit
Joined
Feb 14, 2013
Messages
2
I have twin tohatsu-2000, model m90a's , and after thirty minutes of open water runnning the max rpm falls to low to mid 4,000.
The starboard engine started doing this first then the head gasket failed. I have cleaned the tanks and changed the old fuel line from the tanks to the motor, and fuel seperators. I purchased the boat from Tampa and think there maybe some cooling(corrosion) issue which is causing the engine to go into some safety mode? no alarms come on but the bolts were so frozen on the head that we needed to torch them off. Any thoughts ??
Thanks John
 
TOHATSU GURU

TOHATSU GURU

Admiral
Joined
Jul 22, 2004
Messages
6,164
Re: Twin Tohatsu's with same high end Rpm end loss

If both engines are doing this it is unlikely that the problem is with the engine's. It's more likely that the fuel system is still the culprit.
 
Sea Rider

Sea Rider

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Sep 20, 2008
Messages
12,345
Re: Twin Tohatsu's with same high end Rpm end loss

Just for the record, what was the overall internal condition of pistons, water passages and cylinder head after 12 years of constant use ? Was head gasket dried out, excessive salt formation on water passages, carboned cylinder were found ?

Happy Boating
 
R

rockroussel

Recruit
Joined
Feb 14, 2013
Messages
2
Re: Twin Tohatsu's with same high end Rpm end loss

Sea Rider said:
Just for the record, what was the overall internal condition of pistons, water passages and cylinder head after 12 years of constant use ? Was head gasket dried out, excessive salt formation on water passages, carboned cylinder were found ?

Happy Boating
Click to expand...

I'll let you know still have a couple of bolts to go......
 
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