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Old 09 September 2015, 17:47   #1
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Engine issues

Hi all, me again (Probably fed up of me now!)

So today I hooked up a car battery to the rib and tried to start it. (this is just a spare battery from a neighbours 4WD and not the one I will use)
Basically all the electrics work, gps, fishfinder, tilt/trim, tried to start the engine and it just wouldn't fire up. Attached a video below(Very crude will try and get a better one).

Engine was bought serviced by the previous owner and hasn't ran since, this was about a year ago. Full tank of fuel but might have been sitting for a while.

Any advice on starting procedures for old engines that havn't ran in a while?
Or any problem solving advice?

Engine is a 75hp Mariner 2 Stroke 3 Cylinder.

Thanks,
Jack
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Old 09 September 2015, 18:31   #2
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Quote:
Originally Posted by jack.watts View Post
Hi all, me again (Probably fed up of me now!)

So today I hooked up a car battery to the rib and tried to start it. (this is just a spare battery from a neighbours 4WD and not the one I will use)
Basically all the electrics work, gps, fishfinder, tilt/trim, tried to start the engine and it just wouldn't fire up. Attached a video below(Very crude will try and get a better one).

Engine was bought serviced by the previous owner and hasn't ran since, this was about a year ago. Full tank of fuel but might have been sitting for a while.

Any advice on starting procedures for old engines that havn't ran in a while?
Or any problem solving advice?

Engine is a 75hp Mariner 2 Stroke 3 Cylinder.

Thanks,
Jack
Hi where's the vid
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Old 09 September 2015, 18:35   #3
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No video, so I will start with the embarrassing - is the kill cord connected; and the slightly less embarrassing is the circuit / switch working?

Is there a spark at the plug?
Is fuel getting to cylinder?
Is the choke working?
Have you got the throttle (fast idle) open?
Is it trying to start or just turning over without any signs of running?
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Old 09 September 2015, 18:42   #4
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Originally Posted by Poly View Post
No video, so I will start with the embarrassing - is the kill cord connected; and the slightly less embarrassing is the circuit / switch working?

Is there a spark at the plug?
Is fuel getting to cylinder?
Is the choke working?
Have you got the throttle (fast idle) open?
Is it trying to start or just turning over without any signs of running?
Attached video here :P
It had some moments where I thought it was about to fire up but then lost power from the battery as im having to get my mate to manually connect the battery connections as it doesn't have the right connectors.
Attached Files
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Old 09 September 2015, 18:47   #5
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Originally Posted by jack.watts View Post
Attached video here :P
It had some moments where I thought it was about to fire up but then lost power from the battery as im having to get my mate to manually connect the battery connections as it doesn't have the right connectors.
Where the engine cuts out is where my friend takes the connector of the battery and not the engine
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Old 10 September 2015, 02:00   #6
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fuel possibly no good get rid and drain carbs/ fuel line start with new fuel might need carbs cleaning if they were left with fuel in them for a year. plus all poly has said
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Old 10 September 2015, 02:27   #7
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As per Poly... basic checks will narrow it down... my first would be to pull a plug after whirring it over and see if it is wet with fuel or dry.
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Old 10 September 2015, 03:47   #8
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Did you pump the fuel primer bulb until it went firm, before trying to start it?
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Old 10 September 2015, 04:14   #9
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Spark plugs were dry dry and yes I pumped the bulb till it was firm
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Old 10 September 2015, 04:34   #10
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If the plugs are dry, it suggests there's no fuel getting through. I'm no expert on Carbed 2 strokes, so that's where I bow out, sorry.
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Old 10 September 2015, 05:14   #11
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I'm not familiar with larger engines like yours but I'd be following the route of fuel from tank to carb first. You could pop a hose off under the hood where the fuel goes to filter (I assume) and see if the primer is actually freely pumping fuel up for a start. Then check it's actually getting to the carbs.

I wonder what sort of fuel pump it has and if this might have a problem. Is there any sort of elec fuel solenoid in the system that's not opening?
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Old 10 September 2015, 13:54   #12
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If the bulb pumped hard then you should have got some fuel into the carbs. If you unscrew the screw in the carb float bowls see if fuel comes out. If it does and the engine did fire ,( can't see the vid on an iPhone) then it's not pulling fuel through the system. That could mean no venting, bad fuel pump, hole in a pipe. Either way if the plugs aren't wet that's the problem
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Old 10 September 2015, 13:57   #13
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Okay, well I've just finished rebuilding the fuel pump, new seals etc so that should be fine now, waiting for the proper battery to arrive now to try it
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Old 10 September 2015, 14:04   #14
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Fisrtly don't waste any more time turning it over, clearly something is not right.

Pull the plugs and see if you get a spark from each when turning over. If you have a spark then fuel supply is likely to be the problem.

disconnect the fuel tank and try a fresh can of fuel, after draining all the old fuel. Then its time to look at the carbs.
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Old 10 September 2015, 14:20   #15
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If you do get sparks drop some fuel into the air intake/intakes of the carb/carbs and see if she will run for a few seconds then cut out.
If it does then you have a carb problem ....
Regards
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Old 20 September 2015, 07:08   #16
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If the plugs are "dry" after continually turning it over (don't fry the starter), depending on which engine, it could be a goods fuel-pump in-let or out-let valve.
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