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Old 04 April 2009, 04:19   #1
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Yamaha ID

Seems to be all questions at the moment.

Yamaha 4hp 2 stroke motor,where will I find the ID plate ??

I am guessing its a 100/1 mix as most seem to be, now to date all my motors have had built in fuel tanks,but this needs an external source which I have,including tube and pump bulb.
Now it may seem stupid to most of you but what does it attach to and how ??

Once you have it connected I assume you give it a few pumps to lift the fuel,bit of choke and pull.
Any tips welcomed.

Finally there is a pin missing from the nut that holds the prop on,is it a standard part like a rollpin ?

Only little things so far but what started as looking like a good deal is starting to worry me a bit now,and I havent even got it started yet.Lol

Mike
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Old 04 April 2009, 04:36   #2
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Fuel connector on the engine is 2 prongs-one stainless, one a brass tube with a bit sticking out of it that your connector will plug onto.

The pin missing from the prop will be a split pin. Use an A4 stainless one or it'll give you a headache.
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Old 04 April 2009, 05:01   #3
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Quote:
Originally Posted by mike13401 View Post
Once you have it connected I assume you give it a few pumps to lift the fuel,bit of choke and pull.
Any tips welcomed.
You should pump the bulb in the fuel line until it goes firm.

This might be a good starting point for you:

http://www.yamaha-motor.com/assets/s...-02-85_597.pdf

Though your outboard may differ.

Cheers

Chris
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Old 04 April 2009, 06:30   #4
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Chris thanks that certainly looks like its for my motor.
Although cant tell the year because as usual there is no ID sticker.
TBH I dont remember ever buying a secondhand motor with the stickers still on it.

Just going to pop along to Topsham and pick up a split pin,and some fuel then hopefully vroom.

Mike
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Old 04 April 2009, 13:37   #5
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Ok I have now started the motor and it runs but I am sure could do with a service,also there is a steady flow of coolant water a until it gets warm then its just exhaust smoke.At which point I shut it off.

This is obviously not right so does it need flushing ??
I assume the coolant is picked up through the row of small holes just below the cavitation plate ?

The other thing is with cars,bikes and now boats I do prefer to do my own servicing,but have never serviced an outboard before.
What do I need to cover ?
I s the anyone on the forum who does their own servicing in my area who would be prepared to talk my through it or maybe show me.

Sorry so many questions but I am still learning.

Mike
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Old 05 April 2009, 13:14   #6
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Quote:
I s the anyone on the forum who does their own servicing in my area who would be prepared to talk my through it or maybe show me.
You've come to the right place. There are a few old seadogs on here that can talk you through it. If you've the necessary skills to repair your own car, then an outboard engine will be like second-nature.

For a 4hp 2-stroke service, I'd replace the impeller, renew gear oil, drain fuel filter (assuming there's one), renew spark plugs and check gap, grease propeller shaft and renew split pin, grease throttle and gear linkages, renew starter rope, clean carbs (if running rough), check thermostat (again assuming there's one). Ideally you want to get a service manual too.

Additional work also includes greasing the grease point nipples (you'll need a grease gun for the tilt mechanism and transom screw bolts), check the condition of the sacrificial anode (replace if necessary). If there salt-build up, poke a length of strimmer nylon cord into the tell-tale aperture, general wipe down with WD40 on a rag (not unlike cleaning a locomotive!!!).
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Old 06 April 2009, 12:51   #7
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Just going to pop along to Topsham and pick up a split pin,and some fuel then hopefully vroom.
Mike
Buy a few of them. You should remove and regrease the prop once or twice a year to keep from having it lock up on the shaft.

On the year, Yamaha went away from a year designation a couple or three years ago. They do everything by serial number now. I think this was so that dealers could sell older stock without having to discount it as old stock.

jky
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