Mariner 8hp two stroke not starting

[GART]

The engine was running last season, but will not start this despite new fuel.
Fuel is not getting through carburettor. Can anybody tell me how to get the carb. out and clean it? There are two bolts I can see, but I suspect there is a third underneath not visible, also I cannot see how to get a spanner onto them. Do I have to take the power head off just to get to the carburettor? Or is it possible to clean it in position?
Any advice appreciated

 

[VicS]

I do not know the Mariner so I probably should not be answering but can you not remove the lower half of the casing. Even that will invole disconnecting quite a lot I suspect so label everything you remove and make sketches to show how things go back together.

Removing the power head will involve more work probably starting by removing the lower unit.

Maybe it is just the float or the needle valve stuck. Dismantle the carb very carefully somewhere where you will not loose any little bits especially if you do not have instructions or a diagram.
Are you sure the fuel line from the tank is ok, and the fuel pump and filter.

 

[jleaworthy]

Are you sure it's a fuel problem? Sounds absolutely stupid but I have spent some considerable time in the past trying to start one of these engines after I had inadvertently knocked off that little switch which kills the ignition!!

 

[Nidri240]

I have the 6hp version of this engine and have only recently removed the carb to do the same job.

As an aside, you can buy the instruction manual for these engines on CD from ebay. I bought one and it has definately helped!

To quote from the manual:

"To remove the carb -
1 Loosen primer cam retaining screw.
2 Remove retaining clip
3 Push down on primer arm and pull primer knob, bezel and slide block out of bottom cowl.
4 Remove link wire from fast idle lever.
5 Disconnect fuel line from carb.
6 Remove carb mounting nuts
7 Lift carb from engine. Remove bleed line from bottom of carb."

It's actually quite easy to do, but you must ensure that the primer know is removed.

The carb is then very easy to take apart and clean.

Hope this helps. If you wish, drop me a PM with your email and I can send the relevent section of the manual to you.

 

[graham]

For next year try regullarilly giving a squirt of carb cleaner in through the air intake with engine running.Also use up the fuel in the carb after use so it doesnt evaporate leaving the goo behind. good luck with it,

I am not a mechanic but have stripped and cleaned outboard carbs so it cant be too difficult if I manage it /forums/images/graemlins/wink.gif

 

[GART]

Thanks Guy’s I will try again tonight, Vic, thanks for mentioning the fuel pump, fuel is getting through the filter, but I cannot see after that. Jleaworthy, it is certainly fuel, If I spray engine starter into the back of the carb. it runs for a few seconds, If I put petroil in the cylinders it runs after a few pulls, for a couple of seconds. Nidri240 I have sent PM, Graham, end of last season I ran on a Very high oil mix to lay up for winter (50/50) until fuel ran out to give moving parts protection during winter. I have stripped Johnson, Evenrude and Suzuki carbs. No problem, this one there is no room to get to it everything is crammed it so tightly.
Thanks again

 

[sparkie]

Hi Gart, be interested to hear how you got on with the carb. removal/stripdown- I have similar problems with my 8hp Yamaha and I believe they are the same engine. I've ordered a CD from e-bay in the hope that it will cover my model but it hasn't arrived yet so don't know if it will help.

Cheers

Sparkie

 

[GART]

I got it running tonight, did not work out how to get the Carb off, but I disconnected the fuel pipe after the filter and blew compressed air through it a lot of gunk came out of the carb. into the air filter, I mopped it all up, blew air everyware else, refuled, and it started first pull.

 

[Tisme]

It may be that you were the cause of the problem by running it on a high oil mix at the end of last season. If that introduced gung into the carb it would have stayed there all winter, waiting to get back at you over the last few day!

FWIW I end the season by running till dry on the usual fuel/oil mix. I then put a few squirts of oil in through the spark plug hole and spread it around by pulling the cord a few times. I plug the carb intake with a rag to stop anything getting in. The engine then goes in my shed and get the occaisional pull through the winter months.

Just a thought, but I'm glad you got it working /forums/images/graemlins/smirk.gif

 

[sparkie]

Hi Gart, glad you got a result. I don't have the comp. air facility so it'll have to be stripped. Anyway, at least it shows I'm on the right track with the carb.

Cheers

Sparkie