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#4465491 - 07/20/17 09:00 PM Nissan 120 - Smoking More
Plimbob Offline

Registered: 04/20/17
Posts: 11
Loc: Iowa
I have a Nissan/Tohatsu 120 on my 19.5 Alumacraft which I have owned for 12 years. I have noticed the engine is smoking over the last two years than before. I assumed its due to wear but I really haven't used the boat much in the last 2 years. Maybe 40 hours over the last two year. It runs decent just smokes more now.

The original owner used Cabela Signature semi-synthetic TC-W3 and I have continued using it.

Any thoughts are appreciated.

#4466981 - 07/22/17 09:36 AM Re: Nissan 120 - Smoking More [Re: Plimbob]
ragtoplvr Offline

Registered: 01/14/15
Posts: 529
Loc: missouri
It is probably running rich a low speeds due to a partially plugged air bleed in the carburetor(s0, or possibly a float that is damaged by ethanol and heavy. If injected a leaky or dirty injector putting out big drops of fuel.

Also a pinhole in the fuel pump diaphragm can do this, those normally get worse pretty fast and the motor stops.


#4467630 - 07/23/17 12:10 AM Re: Nissan 120 - Smoking More [Re: Plimbob]
BrocLuno Offline

Registered: 09/06/15
Posts: 5519
Loc: Kalifornia Kollective
Yeah, I'd chase that down. Tohatsu's are tough engines. But extra fuel is not good for them ...
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

#4468741 - 07/24/17 09:07 AM Re: Nissan 120 - Smoking More [Re: Plimbob]
RTexasF Offline

Registered: 10/01/02
Posts: 2879
Loc: North TX
How old is the fuel/oil mix that's in it now?

#4469641 - 07/25/17 06:36 AM Re: Nissan 120 - Smoking More [Re: Plimbob]
sweezy722 Offline

Registered: 07/31/05
Posts: 109
Loc: Tennessee
I would start by decarbing the engine. Google Dunk's Decarb.

#4470415 - 07/25/17 08:53 PM Re: Nissan 120 - Smoking More [Re: sweezy722]
Plimbob Offline

Registered: 04/20/17
Posts: 11
Loc: Iowa

thanks for the input much appreciated. I'll check the suggestions you guys have put forth. I do have some Kano Labs Kreen on hand and have thought about adding some to the fuel to decarb the engine.