yamaha 40hp electicity problem

Panda · 13 November 2009, 12:22

Hi guys,was wondering if anyone has a wiring diagram for approx 1980 2 cyl 2t yam? i think i may be coming to the steep part of this particular learning curve.bought un-tested motor,spark appears utterly absent.have studied all relevant threads,cannot find any elecricity coming from magneto.think the motor has been converted from electric to manual start,so there are more wires than strictly necessary,but i think im testing the right ones, ie the only ones that seem to go anywhere.(one to ground,and one brown) should my next move be to remove and inspect magneto?
I saw some guy saying "a boat is a hole in the water,surrounded by fibreglass,into which you throw money",i'm worried now. Help!

Panda · 13 November 2009, 12:41

correction there is leccy coming out of magneto,it then disappears into a black box. (i hate black boxes).

Panda · 13 November 2009, 12:54

ha ha guess what? it goes in the black box,but it doesnt come out the other side! I hate black boxes even more now!!

9D280 · 13 November 2009, 13:02

Just before you start ripping the engine to bits, your deadman is in, isn't it.....?

If it is, have a look at

http://continuouswave.com/whaler/ref...ColorCode.html

Scroll down to almost the bottom, that might give you a lead......

Panda · 13 November 2009, 13:16

forgive my ignorance,but is a deadman the lanyard thingy that cuts the motor if you fall out of the boat? if so,it doesnt have one,it just has a kill button. thanks for the link,that is very useful.am now looking for a local black box dealer....

9D280 · 13 November 2009, 13:23

Yes.

Does your stop button have a groove behind the red bit? if so, put your fingers behind it & pull. If it moves out, your lanyard is missing, so it thinks you've gone for a swim........

Needless to say a new lanyard is going to be a lot cheaper than a new black box of any description........

Panda · 13 November 2009, 13:48

sadly,its just a kill button,it goes in not out,and has a red rubber cover with no groove.am now steeling self for call from bill higham.if i had a pound for every dead black box i have ever replaced etc

9D280 · 13 November 2009, 14:01

How old is it?

My old Yam had a thermal cut - out switch bolted to the top of the head that shared itl;s circutry with the deadman, theory being an overheat just killed the engine. (Donlt you just love old technology!

) Doyou have something similar? If so, just disconnect it & see if things improve (it's normally open, closes on too much heat)

On a similar theme, unplug your stop switch & see what happens.

How old is the engine? I guess quite if you have a rubber covered stop button.

Panda · 13 November 2009, 23:47

im pretty sure its 1980 model.have checked and re-checked,cant find any sign of a thermal cut out.tried disconnecting kill button to no avail,so it looks like the cdi is it.there is definitely no electrocity coming out of it.have found 2nd hand one for £50 on ebay,so hey ho.
am thinking of writing "diary of a noob" with running £total.

Nos4r2 · 14 November 2009, 04:08

Quote:

Originally Posted by Panda

im pretty sure its 1980 model.have checked and re-checked,cant find any sign of a thermal cut out.tried disconnecting kill button to no avail,so it looks like the cdi is it.there is definitely no electrocity coming out of it.have found 2nd hand one for £50 on ebay,so hey ho.
am thinking of writing "diary of a noob" with running £total.

Before you go spending 50 quid on it, do a compression check with a tester and post the results. They should be within 10% of each other at worst or there's no point in fixing the ignition.