Topic: 1978 Evinrude 2hp. – Page 2 – Antique Outboard Motor Club,Inc

This topic has 19 replies, 9 voices, and was last updated 3 years, 6 months ago by Buccaneer.

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October 17, 2020 at 9:55 am #218735
russ
Participant
Have sprayed different cleaners thru. Took lower end off still no start. Put piston at tdc and put some carb cleaner on top left for 10 min lifted motor up to dump out cleaner nothing came out. Put back in vice carb cleaner coming out lower end.Tried to start again and got a little flame out bottom after 10 pulls.Re checked compression 55 psi.
October 17, 2020 at 10:17 am #218737
The Boat House
Participant
Another compression is too low.
- This reply was modified 3 years, 6 months ago by The Boat House.
October 17, 2020 at 4:32 pm #218775
Mumbles
Participant
This two horse had a blown head gasket and the escaping fire burned a groove into the head and the top of the cylinder. A piece of aluminum casting was also missing from the cylinder in the same area so it took a bit of machining to get both surfaces into acceptable condition again.

Another problem with these motors is the crankshaft seals. Dealer says you have to buy the lower case half with the bearing and seal already installed as a unit. Not so. The bearing and seal can be pressed out and replaced as needed. No matter what anyone says, leaking crank seals do not contribute to the cylinders low pressure. That is governed by the condition of the cylinder itself and the piston and rings.
- This reply was modified 3 years, 6 months ago by Mumbles.
- This reply was modified 3 years, 6 months ago by Mumbles.
- This reply was modified 3 years, 6 months ago by Mumbles.
- This reply was modified 3 years, 6 months ago by Mumbles.
- This reply was modified 3 years, 6 months ago by Mumbles.
October 17, 2020 at 5:55 pm #218784
russ
Participant
Thanks mumbles and everyone else for help. Will check out head gasket before I do any more. Thanks Russ…
October 17, 2020 at 6:46 pm #218787
frankr
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US Member - 1 Year (includes $3 online payment fee)
mumbles wrote, ” No matter what anyone says, leaking crank seals do not contribute to the cylinders low pressure. That is governed by the condition of the cylinder itself and the piston and rings.”. That is true, BUT many do not realize that crankcase compression is also important in a two-stroke. Worn bearings and seals can make a non-runner, as mumbles also suggested.
October 17, 2020 at 7:05 pm #218794
crosbyman
Participant
Canada Member - 2 Years
reeds any good ?? maybe they don’t close pushing whatever fumes if any were sucked in ….right back out the carb face ??

gas will explode in a stack of coke cans or tube to launch tennis balls or potatoes how come this 2hp won’t ignite a teaspoon poured in the cyl. ????

p.s. not motor related I know…..but I have lost a few tennis balls with a shot of lighter fluid 🙂 🙂

Joining AOMCI has priviledges 🙂
October 17, 2020 at 9:12 pm #218799
frankr
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US Member - 1 Year (includes $3 online payment fee)
Not claiming to be a pyrotechnician, but gas doesn’t burn. Gas VAPOR burns when mixed with the proper ratio of fuel/air mixture. Too much gas is “flooded”. Or something like that. Something I learned in school but forgot.

But I haven’t forgotten when I emptied a 12 GA shotgun shell into a glass aspirin bottle and tossed it into a campfire. Don’t try that at home.
October 17, 2020 at 11:53 pm #218802
crosbyman
Participant
Canada Member - 2 Years
My dad was a fireman his biggest nightmares were about me with my ” experiments” 🙂 🙂 🙂 he was always worried about coming over to our house with a fire truck and a dozen of his buddies to extinguish my “experiments” …

the jokes would have haunted him all is career …but I never did burn the house down and he ended up working himself up into the fire hall director’s job .

He always said a cup of gaz is worth 10 sticks 🙂 so I just fooled around with homemade black powder .

Joining AOMCI has priviledges 🙂
October 18, 2020 at 5:29 am #218804
billw
Participant
US Member - 2 Years
Ah, the infamous OMC 2 hp. There really couldn’t be a more simple outboard motor; and yet, it often holds so many mysteries….I remember the time one kicked my butt, with a porous carb casting….(I am NOT saying this is the OP’s problem. If his compression gauge is accurate, COMPRESSION is the problem.)

Long live American manufacturing!
October 18, 2020 at 8:26 am #218809
Buccaneer
Participant
US Member - 1 Year (includes $3 online payment fee)
frankr wrote:

Not claiming to be a pyrotechnician, but gas doesn’t burn. Gas VAPOR burns when mixed with the proper ratio of fuel/air mixture. Too much gas is “flooded”. Or something like that. Something I learned in school but forgot.

But I haven’t forgotten when I emptied a 12 GA shotgun shell into a glass aspirin bottle and tossed it into a campfire. Don’t try that at home.

“Gas doesn’t Burn”……. after thinking about Frank’s quote, I have noted that when
it’s 30 below out and you use a little gas to get a fire started, the gas is a LOT
less volatile than on a summer day!

Prepare to be boarded!
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