Yamaha outboard advice

[diapason]

I've got a Yamaha P65 outboard which came with my boat. Previous owner thinks it dates from 1972. It won't start, and there is no spark. There seem to be two possible causes. There are two very small bore fuel pipes on the right hand side of the engine (if you are facing the propellor). One appears to be a breather and the other, which is unattached, 'leaks' petrol when the primer is pressed. I can't see where it is supposed to be connected. The other issue - on the same side of the motor - is electrical. There are two wires, one black and the other white. The black wire plugs into another black wire which seems to go to the kill button on the tiller. The other, white, wire, terminates in a female connector and there is no wire to plug it in to. I'm told that the motor was running about a year ago, albeit roughly. I don't want to spend a fortune on an ancient motor, but, if it could be fixed easily, it could be useful. Has anyone perhaps got a similar engine and/or a manual who could advise me how (if?) this wire and fuel pipe should be connected.

Thanks for your help,

Nigel

 

[claudio]

Check out http://www.boats.net/ for parts and exploded diagrams

 

[VicS]

Check out http://www.boats.net/ for parts and exploded diagrams

For a 1972 model ... I think not.
I know of no information on line for a Yamaha that old

The pipe that leaks petrol when the bulb is squeezes is obviously the incoming fuel supply.

Normally from the inlet connector it would go to the fuel pump ( integral with the carb on more modern Yamahas but I'd not know about one that old.

Somewhere there will be a filter maybe part of the pump assembly but later models I think have an inline filter between the inlet connector and the pump/carb.

My guess is that what you think is a vent is in fact the inlet pipe to the pump and carb and that it should be joined to the other one by an inline filter.

OK the black wire is very possibly the connection to the kill button. It would be wise to check that out. Disconnect and insulate if the button appears to be shorting to earth

The white wire may be an electrical output for lighting or even battery charging if a rectifier is fitted.

 

[diapason]

Many thanks for your advice. Unfortunately, my engine is too old to come under the radar of boatsnet . I'll have the use of a workshop later this month and will try to strip and clean the motor. Hopefully, I can then identify where these fuel lines are supposed to fit. I found and cleaned a fuel sedimenter, but there were no leaks from this and no obvious fuel line fittings. I've seen a manual on Ebay, but it's not cheap, so I'll fiddle first. Thanks again.
Nigel

 

[2nd_apprentice]

Perhaps worth checking points, condenser, timing, spark plug and lead.
Doesn't sound like PO ever serviced them an they do wear out.

 

[diapason]

You're right, the poor thing looks like it's not had much attention for years. I can't use a petrol motor on the lake, but would like to have it working for when I trailer the boat down to Cornwall.
N