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Intro and small boat engine thread
Posted on 1/22/14 at 9:50 am
Posted on 1/22/14 at 9:50 am
Whats up everybody I been hanging around here for a while now and I feel like this board has quite a wide range of knowledgeable people, so I can come here with most of my sporting questions. Duck hunting and water skiing are my two favorite outdoor hobbies but any time out doors is time well spent, hopefully I'll be able to contribute something here but there's a reason I don't post much. I'm 21 and an RNR student at LSU from Baton Rouge
So I inherited a 1985 Yammy 2 hp engine a few weeks ago and I'm attempting to get it back to as close to 100% as I can. It got its fair use from '85-'89 and prety much sat in a shed from then until a month ago. I'll post of a picture of it later today...I started by just cleaning it with some degreaser, put some fresh gas (with stabil and Sea Foam), changed the lower unit oil and put grease in the Zerk fitting.
I got the engine running fine, and thinking it was air cooled let it run out of water for about a minute, come to find out it does have an impeller, its just old and destroyed and wont pump...so I ordered a new kit. I'm gonna remove the old one today and put the new one in when it comes in on Friday, but this small repair is pretty much the limit of my knowledge. What I'm gettin at is that this is the first thing like this I've done, I don't work on engines or cars so I'm just doing what I've learned from my dad owning his boat. What are some other things I should do to get this engine running right? no maitenence has been done on it since it left the factory from what I can tell
This what she looked like brand new, the cowling caught on fire at least once from a leaky gas cap but I have a new seat and gasket on the way for dat.
Thanks for your time and answers men
So I inherited a 1985 Yammy 2 hp engine a few weeks ago and I'm attempting to get it back to as close to 100% as I can. It got its fair use from '85-'89 and prety much sat in a shed from then until a month ago. I'll post of a picture of it later today...I started by just cleaning it with some degreaser, put some fresh gas (with stabil and Sea Foam), changed the lower unit oil and put grease in the Zerk fitting.
I got the engine running fine, and thinking it was air cooled let it run out of water for about a minute, come to find out it does have an impeller, its just old and destroyed and wont pump...so I ordered a new kit. I'm gonna remove the old one today and put the new one in when it comes in on Friday, but this small repair is pretty much the limit of my knowledge. What I'm gettin at is that this is the first thing like this I've done, I don't work on engines or cars so I'm just doing what I've learned from my dad owning his boat. What are some other things I should do to get this engine running right? no maitenence has been done on it since it left the factory from what I can tell
This what she looked like brand new, the cowling caught on fire at least once from a leaky gas cap but I have a new seat and gasket on the way for dat.
Thanks for your time and answers men
This post was edited on 1/22/14 at 10:15 am
7
Posted on 1/22/14 at 9:52 am to Lightnin Hopkins
make sure the impeller blades are going the right way. And use a tie wrap to get them started back in the housing. And do not lose the shaft key when removing the old one.
Posted on 1/22/14 at 9:55 am to meauxjeaux2
I was told to always spin it clockwise when you insert it, interested to see about this key though. I can't find a picture or video of it anywhere but everybody warns about dropping it inside the engine or on the ground
Posted on 1/22/14 at 10:14 am to Lightnin Hopkins
quote:
everybody warns about dropping it inside the engine or on the ground
TRUTH
Posted on 1/22/14 at 10:31 am to Lightnin Hopkins
I have no experience with old yamaha's, but I recently worked on my 1968 6 hp Evinrude with a mechanic and learned a few things.
From what you have said it sounds like you got it running fine to begin with, so that is good. Two things I would check before I would take it out are
1.) Take the spark plugs out, wipe them and the threads you screw them out of with a towel to get any crud off. Make sure that the ground wire (tip) of the spark plug isn't bent. And check each spark plug to see if you get a spark when you try to crank it. Refer to the video below.
Checking for a spark
2.) Give the flywheel a good clockwise spin with your hand. It should spin a little on it's own. If the flywheel is hard to spin, then you have some more serious issues and may need to find someone with more knowledge.
You may find this link helpful 1985 Yamaha 2sk Outboard Parts
The only other piece of advice I have is to make sure you have paddles in the boat.
From what you have said it sounds like you got it running fine to begin with, so that is good. Two things I would check before I would take it out are
1.) Take the spark plugs out, wipe them and the threads you screw them out of with a towel to get any crud off. Make sure that the ground wire (tip) of the spark plug isn't bent. And check each spark plug to see if you get a spark when you try to crank it. Refer to the video below.
Checking for a spark
2.) Give the flywheel a good clockwise spin with your hand. It should spin a little on it's own. If the flywheel is hard to spin, then you have some more serious issues and may need to find someone with more knowledge.
You may find this link helpful 1985 Yamaha 2sk Outboard Parts
The only other piece of advice I have is to make sure you have paddles in the boat.
Posted on 1/22/14 at 10:31 am to Lightnin Hopkins
What are you studying?
Also, just go ahead and completely disassemble the carb and clean it. No doubt it is gummed up. New plug, air filter, etc. General tune-up
Also, just go ahead and completely disassemble the carb and clean it. No doubt it is gummed up. New plug, air filter, etc. General tune-up
Posted on 1/22/14 at 10:36 am to Lightnin Hopkins
I can't contribute to your questions about the engine, but wanted to say welcome to the OB. 
Posted on 1/22/14 at 10:58 am to Hammertime
quote:
Also, just go ahead and completely disassemble the carb and clean it.
THIS^^^
I honestly don't know how it started if it sat up for that long. But hey, if it starts.. good. But you'll still want to rip that thing open and clean the crap out of it. Definitely check the plugs and re-gap if needed or replace.
Also just run the shift linkage and all, and make sure switching from forward to reverse is all squared away and tight.
Posted on 1/22/14 at 11:30 am to Lightnin Hopkins
I'm assuming it is a 2-stroke, does it take a fuel and oil pre-mix? The 2 hp won't likely have the oil injector that the larger 2-stroke Yamahas of that era used. The best therapy for these motors is to get them running and then run them.
That said, new plug wires may be a good idea in addition to the new water pump assembly. If there is a thermometer in the water cooling system in that motor, you may want to replace it also. Those tend to dry rot if the motor sits up. If there are no leaks in the fuel line or in the block, you could be good to go with just the maintenance items.
Break it in slowly, like don't take it straight to the middle of nowhere. Make sure you can trust it before you venture too far alone. That would be a killer motor on a pirogue or flat transom canoe.
I run a 1986 Yamaha 2-stroke 50 hp which I have rebuilt bit by bit over the last three years. Assuming there is no major problem, they can run forever.
That said, new plug wires may be a good idea in addition to the new water pump assembly. If there is a thermometer in the water cooling system in that motor, you may want to replace it also. Those tend to dry rot if the motor sits up. If there are no leaks in the fuel line or in the block, you could be good to go with just the maintenance items.
Break it in slowly, like don't take it straight to the middle of nowhere. Make sure you can trust it before you venture too far alone. That would be a killer motor on a pirogue or flat transom canoe.
I run a 1986 Yamaha 2-stroke 50 hp which I have rebuilt bit by bit over the last three years. Assuming there is no major problem, they can run forever.
Posted on 1/22/14 at 12:53 pm to Hammertime
My concentration is in wetland science but I still have another year and a half left. I just got everything to my buddy's house and were about to open up the lower unit. Pictures to come as we get it going
Posted on 1/22/14 at 1:08 pm to Lightnin Hopkins
Forestry is cooler 
Posted on 1/22/14 at 1:22 pm to Lightnin Hopkins
I have a similar looking 2 hp Suzuki that starts easily even after sitting up for a year. Be sure to buy ethanol free gas.
Posted on 1/22/14 at 2:44 pm to Lightnin Hopkins
It looks like that prop is the old kind with a shear pin. If so, if get a spare or two and keep them in the boat somewhere safe. They could save you from a bunch of paddling.
Oh...and welcome to the OB
Oh...and welcome to the OB
Posted on 1/22/14 at 3:03 pm to MadtownTiger
She doesn't have reverse, just spins a full 360.
I did take the bowl off but there was almost nothing in there (few specks of dirt), besides the cork, which was very surprising. I'll re gap once we reassemble it. Right now the whole bottom end is off, just waiting for the new impeller kit to come in. I
Posted on 1/22/14 at 3:06 pm to weisertiger
Thanks weiser, both of those links were very helpful. Now when I start tearing into it I'll have a little comfort of mind knowing where to find replacement parts.
Posted on 1/22/14 at 3:10 pm to TBoy
Yeah T-Boy its a two stroke. It runs on 1:100, I've only ever heard of that for breaking in new engines and the like but thats what it says printed clear as day so thats what she'll get. Not sure if there is a thermometer but this is a great time to find out, if there is I'm sure it'll need replacing. Like you said, if I get it running right, it'll last until I can give it to my kid
Posted on 1/22/14 at 4:39 pm to Lightnin Hopkins
What you really need to clean is the jets in the carb. I use thin speaker wire to do it
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