Tohatsu 90A Starts, revs up to 3000 rpm then stalls - Spearboard.com - The World's Largest Spearfishing Diving Boating Social Media Forum

Castor · 08-11-2016, 11:31 AM

I just went through my Tohatsu 90 and installed new base gasket, head gasket, water jacket gasket, exhaust gaskets, new lower crank seal, rebuilt carbs (with new carb kit), rebuilt the fuel pump, new plugs, new t stat, new water pump. When I put everything back together it starts right up, revs to 2500 or more and then stalls.

Compression is good (105 cold and even with throttle in neutral). Gas is fresh.

I checked my coils and it look like I have one dead one. I have ordered a new one but I am having a hard time believing this would cause it to rev up.

Any help would be greatly appreciated.

Thanks.

Rob

Castor · 07-14-2019, 09:33 AM

If anyone has a similar issue it was a bad coil

Marcus · 07-14-2019, 11:11 AM

Thanks. That's very interesting as I would've never had suspected.such. The reving up to a certain RPM range all by itself had me puzzled. The coil has nothing to do with that. It sounds like it was being throttled into that range and coil opened once heating up.

Kahuna · 09-15-2020, 03:08 PM

Either that or for some reason the engine still thinks its in neutral and the rev limiter kicked in.


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08-11-2016, 11:31 AM	#1
Castor Registered User Join Date: Sep 2004 Location: San Diego Posts: 935	Tohatsu 90A Starts, revs up to 3000 rpm then stalls I just went through my Tohatsu 90 and installed new base gasket, head gasket, water jacket gasket, exhaust gaskets, new lower crank seal, rebuilt carbs (with new carb kit), rebuilt the fuel pump, new plugs, new t stat, new water pump. When I put everything back together it starts right up, revs to 2500 or more and then stalls. Compression is good (105 cold and even with throttle in neutral). Gas is fresh. I checked my coils and it look like I have one dead one. I have ordered a new one but I am having a hard time believing this would cause it to rev up. Any help would be greatly appreciated. Thanks. Rob

07-14-2019, 09:33 AM	#2
Castor Registered User Join Date: Sep 2004 Location: San Diego Posts: 935	Re: Tohatsu 90A Starts, revs up to 3000 rpm then stalls If anyone has a similar issue it was a bad coil

07-14-2019, 11:11 AM	#3
Marcus Naval gazer extraordinair Join Date: Jan 2003 Posts: 42,214	Re: Tohatsu 90A Starts, revs up to 3000 rpm then stalls Thanks. That's very interesting as I would've never had suspected.such. The reving up to a certain RPM range all by itself had me puzzled. The coil has nothing to do with that. It sounds like it was being throttled into that range and coil opened once heating up. __________________ “If the natural tendencies of mankind are so bad that it is not safe to permit people to be free, how is it that the tendencies of these organizers are always good? Do not the legislators and their appointed agents also belong to the human race? Or do they believe that they themselves are made of a finer clay than the rest of mankind?” ― Frederic Bastiat, The Law

09-15-2020, 03:08 PM	#4
Kahuna Registered User Join Date: Feb 2004 Location: Gulf Harbors( The Woodlands) Posts: 1,137	Re: Tohatsu 90A Starts, revs up to 3000 rpm then stalls Either that or for some reason the engine still thinks its in neutral and the rev limiter kicked in.

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