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Nissan 120 - Smoking More #4465491
07/20/17 09:00 PM
07/20/17 09:00 PM
Joined: Apr 2017
Posts: 11
Iowa
Plimbob Offline OP
Plimbob  Offline OP
Joined: Apr 2017
Posts: 11
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.

Re: Nissan 120 - Smoking More [Re: Plimbob] #4466981
07/22/17 09:36 AM
07/22/17 09:36 AM
Joined: Jan 2015
Posts: 613
missouri
ragtoplvr Offline
ragtoplvr  Offline
Joined: Jan 2015
Posts: 613
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.

Rod

Re: Nissan 120 - Smoking More [Re: Plimbob] #4467630
07/23/17 12:10 AM
07/23/17 12:10 AM
Joined: Sep 2015
Posts: 5,868
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,868
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.
Re: Nissan 120 - Smoking More [Re: Plimbob] #4468741
07/24/17 09:07 AM
07/24/17 09:07 AM
Joined: Oct 2002
Posts: 2,937
North TX
RTexasF Offline
RTexasF  Offline
Joined: Oct 2002
Posts: 2,937
North TX
How old is the fuel/oil mix that's in it now?

Re: Nissan 120 - Smoking More [Re: Plimbob] #4469641
07/25/17 06:36 AM
07/25/17 06:36 AM
Joined: Jul 2005
Posts: 112
Tennessee
sweezy722 Offline
sweezy722  Offline
Joined: Jul 2005
Posts: 112
Tennessee
I would start by decarbing the engine. Google Dunk's Decarb.

Re: Nissan 120 - Smoking More [Re: sweezy722] #4470415
07/25/17 08:53 PM
07/25/17 08:53 PM
Joined: Apr 2017
Posts: 11
Iowa
Plimbob Offline OP
Plimbob  Offline OP
Joined: Apr 2017
Posts: 11
Iowa
Gents,

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.


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