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Old 05 August 2013, 05:00   #11
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It does sound like extreme fuel starvation.

I don't know what sort of bits you have in the garage but I'd quickly rig up a very small amount of fuel in a "header" tank (something like a car gear oil container would do) just with a short hose onto the outboard connector, no primer bulb. This will confirm if you have a tank/hose/primer issue or if it's the outboard.

One of the things I always carry on the boat is a full length spare fuel line complete with primer bulb and clips to fit.

I assume this is the 25hp bought from Peter? Did the tank and line come with the outboard? He seems a very decent guy, have you asked him for ideas?
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Old 05 August 2013, 05:25   #12
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It does sound like extreme fuel starvation.

I don't know what sort of bits you have in the garage but I'd quickly rig up a very small amount of fuel in a "header" tank (something like a car gear oil container would do) just with a short hose onto the outboard connector, no primer bulb. This will confirm if you have a tank/hose/primer issue or if it's the outboard.

One of the things I always carry on the boat is a full length spare fuel line complete with primer bulb and clips to fit.

I assume this is the 25hp bought from Peter? Did the tank and line come with the outboard? He seems a very decent guy, have you asked him for ideas?
I should be able to jury-rig something to try a gravity feed fuel supply and see if that works out.

I've found the parts catalogue for the engine and the fuel pump assembly, which I think should be easy enough to get to if need be.

It is the engine from Peter, I may well ask him for advice but I've already made extra work for him (the delivery lorry reversed into our neighbours car and then drove off!), so I'll try to sort it out myself first - typical stubborn bloke syndrome!!

Cheers,

Andrew.
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Old 05 August 2013, 15:14   #13
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Go for a test spin, when engine starts dying, prime bulb several times, if engine catches rpm again in most cases iit's a faulty fuel pump diaphragms condition. Is carb inmaculate clean ? You could have dried 2 strokes oil residue on internal carb paths that reduces the required fuel amount for engine to run properly.

Happy Boating
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Old 08 August 2013, 16:56   #14
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Developments....

I ordered a new fuel hose and primer pump and gave the engine another shot this evening. At first the priming still felt 'soft', although the fuel filter bowl was full. I removed the fuel pipe where it went into the fuel filter and tried the primer pump again and fuel was coming out happily. Reconnecting that pipe to the filter mad the priming felt much better and the bulb went hard. Maybe an airlock?

Anyhow, the engine still wouldn't start, not a sniff of a fire, choke in or out. Next I tried putting the fuel tank on the garage roof which have a good meter or so of gravity head. Now the engine started quite easily with the choke fully out, raced a bit then settled down to a fast idle. Pushing the choke in and it died within a couple of settings.

I was then able to put the fuel tank back at ground level and it still started on the choke but died after the choke was put in. You can see this behaviour on this video:



It does this consistently now - choke out, starts; choke in either doesn't start or if it is running it dies.

I guess the next thing to look at is the fuel pump, if only because it's not too tricky to get into by the looks of it...
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Old 08 August 2013, 17:07   #15
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So if you leave it on choke a bit longer and then creep the choke back in? So maybe 1/4 of the way in and wait 30 seconds then another 1/4 etc?

Clean fuel?

But my gut is still on the pump. When you moved the tank from the roof to the floor have you released any pressure - disconnected fuel line and opened filler cap on tank?
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Old 08 August 2013, 17:13   #16
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Blocked jets. Carbs need a strip/clean.

That's not running for long enough to empty the floatbowls so it can't be the fuel pump-particularly as the gravity feed made no difference.
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Old 08 August 2013, 18:34   #17
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Blocked jets. Carbs need a strip/clean.

That's not running for long enough to empty the floatbowls so it can't be the fuel pump-particularly as the gravity feed made no difference.
+1 had exactly the same on a 30 yam. Cleaning up the carbs fixed it.

If it's running with the choke out it seems to me the mixture is way too lean without the choke cutting out some of the air...so blocked jets would be my guess.(maybe dirt or grit or something come loose when in transit and found its way to jets?)
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Old 09 August 2013, 04:55   #18
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Yeah, I had a feeling it would be the carb jets. My first bike (Suzuki GN125) had very similar problems when I got it and that was obviously because it had been left sitting with fuel in the tank for the best part of 10 years - rusted tank and gummed carb. Took about 4 strip downs and rebuilds to get the carb clean.

I've found a service manual (http://www.mdmotors.ru/netcat_files/216/180/20d_25n.pdf if anyone needs it) and will give it a go, but it's going to have to wait until September now, as it's holiday time (luckily I wasn't planning on taking the outboard!).

Cheers,

Andrew.
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