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  Topic Review (Newest First)
09-08-2015 06:59 PM
Ulladh
Re: Nissan / Tohatsu 6h 4 stroke

You may have a small piece of debris in one of the jets from tank or fuel line.
If clean gas with or without ethanol does not improve operation, replace the filter and clean the carb.
09-08-2015 06:53 PM
rambobva
Re: Nissan / Tohatsu 6h 4 stroke

Thanks for the response, I will run the carburetor out of gas before shutting it down and will add stabil/seafoam to the tank. Am thinking of putting an inline filter on the gas line. I did fill the tank with nonethanol gas at the beginning of summer but thinking of only keeping small (gallon) amount of gas in tank and adding new gas over the summer. I do suspect the gas or carburetor but the motor doesn't react like it has a gas/carb problem. I tried to start the motor on Sunday but after many pulls and over an hour of trying to start I gave up. Came back on Monday it started on the 1st pull and idled fine for over 20 minutes but would not restart after our 4 hour sail. I'm confused if it is the gas it should effect it whenever it is running, but once it starts it runs great. Will post results as I have them. Thanks again for your response.
09-08-2015 12:47 PM
fryewe
Re: Nissan / Tohatsu 6h 4 stroke

Quote:
Originally Posted by rambobva View Post
We are generally gone for several weeks so the engine has not been run very much (under 10 hrs).
Ethanoled fuel you use has gelled in your carburetor, most likely.

If you are using the motor infrequently, and use very little gas, I recommend you use aviation gas as fuel. Most small engine shops in my area use it exclusively when they prepare new items for buyers, and after repairing small engines for customers. It will not contaminate your carburetor and does not deteriorate with time.

It is expensive...$5.20 a gallon when I purchased it three months ago...perhaps a little less now that crude oil prices are down a bit more. I buy it at the local general aviation airport. They are happy to sell it to me in small batches.

Another thing you can do to prevent carburetor fouling is turn off the fuel supply before pulling the kill lanyard on the engine. Let the engine run until the carburetor runs out of fuel and the engine dies.

Another option is to treat the fuel with Stabil/Seafoam to avoid gelling of the fuel.
09-08-2015 12:26 PM
Ulladh
Re: Nissan / Tohatsu 6h 4 stroke

Check the hose connection at tank and motor for tight fit, check that the air vent on the tank is fully open, check the fuel filter or replace, and most important fresh fuel.
09-08-2015 10:42 AM
rambobva
Re: Nissan / Tohatsu 6h 4 stroke

I purchased a new Tohatsu 6hp 4 stroke outboard this year. At first I had no problems with the engine but lately I have been having a lot of trouble starting the engine. We live in Virginia but our sailboat is moored on Chautauqua Lake in SW New York. We are generally gone for several weeks so the engine has not been run very much (under 10 hrs). The engine will start with one or two pulls but runs rough for at least 5 minutes but stalls as soon as I put in in gear. Sometimes it will restart but usually not. We will wait a few minutes and it was restarting and ran well. On Sunday we tried to start the engine but could not get it going after an hour of trying. Came back yesterday and it started on the 1st pull and ran well while we prepared the boat to sail. I was able to back he boat out of the slip but it stalled and wouldn't restart but we were able to set sails and move away from the dock. When returning we tried to restart the engine but it would not catch. Had to sail into the slip. Any ideas on what is going on?
06-21-2015 08:57 PM
fivetoes
Re: Nissan / Tohatsu 6h 4 stroke

did you ever find out what was wrong with your 6HP? Just bought one (Tohatsu 6HP) and ironically discovered the same problem! Your post is the only one I can find that sounds exactly like what we are experiencing. Please share any info with me at: tobackperio@gmail.com
01-31-2014 07:53 PM
dabnis
Re: Nissan / Tohatsu 6h 4 stroke

Quote:

Quote:
Originally Posted by christian.hess View Post
did you read the link I put a few pages back

its can be used as refference for other johnson motors

my last johsnon was a 6hp longhshaft...

just keep the exhaust fumes flowing and make sure it doesnt suck up the fumes...as it will overheat and depower...

there is a mod to the engine cover I fiorget what it was for the 6 but on other motors it includes making a vent to route clean air in and dirty fumes out

cheers
Quote:
Some years back I converted one of my outboards to long shaft. There are lots of OMC parts shops on the web. IIRC, all I needed was a drive shaft, water pick up tube, shift rod extension, maybe a new rod?, and the lower leg spacer. My guess is that all the parts could be had for $100?

Good point on the ventilation issue . On our Coronado 25 we had to keep the cover wide open all the time or it would load up. I drilled some small holes near the top of the cowling which seemed to help.

Paul T
Forgot this, the most difficult part of the conversion was re-installing the power head end of the water pick up tube. There is an o ring that fits into a recess in the block, it kept falling out. Finally put some gasket seal on it, let it dry for a while and stuck it into the recess.

What I should have done was to turn the motor upside down, it would have also been much, much easier to see what I was doing, Duh!! My wife says that at times I get "overly focused".

Paul T
01-31-2014 04:52 PM
ericb760
Re: Nissan / Tohatsu 6h 4 stroke

The mods have approved an Outboard Mintenance sticky. Please come check it out, especially those of you with extensive outboard knowledge!
01-31-2014 11:46 AM
dabnis
Re: Nissan / Tohatsu 6h 4 stroke

Quote:
Originally Posted by christian.hess View Post
did you read the link I put a few pages back

its can be used as refference for other johnson motors

my last johsnon was a 6hp longhshaft...

just keep the exhaust fumes flowing and make sure it doesnt suck up the fumes...as it will overheat and depower...

there is a mod to the engine cover I fiorget what it was for the 6 but on other motors it includes making a vent to route clean air in and dirty fumes out

cheers
Some years back I converted one of my outboards to long shaft. There are lots of OMC parts shops on the web. IIRC, all I needed was a drive shaft, water pick up tube, shift rod extension, maybe a new rod?, and the lower leg spacer. My guess is that all the parts could be had for $100?

Good point on the ventilation issue . On our Coronado 25 we had to keep the cover wide open all the time or it would load up. I drilled some small holes near the top of the cowling which seemed to help.

Paul T
01-31-2014 10:23 AM
christian.hess
Re: Nissan / Tohatsu 6h 4 stroke

Quote:
Originally Posted by Lou452 View Post
Your only limits will be time, money, skill and desire. Take it over if you feel the need.
Let us know how it goes, success or not. All of life is a learning process. If you share we will learn. Well maybe we will
best wishes , Lou
did you read the link I put a few pages back

its can be used as refference for other johnson motors

my last johsnon was a 6hp longhshaft...

just keep the exhaust fumes flowing and make sure it doesnt suck up the fumes...as it will overheat and depower...

there is a mod to the engine cover I fiorget what it was for the 6 but on other motors it includes making a vent to route clean air in and dirty fumes out

cheers
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