2005 Yamaha 70Hp BETOL wont start

[xfixiate]

2005 Model
Brother in law decided to wire up the battery the wrong way. :facepalm:
I've replaced the 20AMP fuse which was fried , checked the wiring, nothing obvious.
Power tilt/trim works OK
instruments work OK
Motor cranks but no spark.
What should I test next, and how? I have a multimeter but dont know where I should begin.
Any help greatly appreciated.
Cheers,
John

 

[99yam40]

Re: 2005 Yamaha 70Hp BETOL wont start

Test inputs and outputs of CDI to see what is in spec and what is not.
You will need a service manual and a peak reading meter or a DVA adapter made for reading these ignition system voltages

 

[Silvertip]

Re: 2005 Yamaha 70Hp BETOL wont start

My initial reaction would be to let the brother-in-law take care of the issue but then he's the one that mucked it up in the first place so that would likely be a bad idea. Check that the kill switch is not tripped. You would not be the first to be in that situation.

 

[xfixiate]

Re: 2005 Yamaha 70Hp BETOL wont start

My initial reaction would be to let the brother-in-law take care of the issue but then he's the one that mucked it up in the first place so that would likely be a bad idea. Check that the kill switch is not tripped. You would not be the first to be in that situation.

Kill switch being the lanyard?
If its the CDI then its dealer time, they charge double prices for parts comapred to US prices (Im in Australia0

 

[xfixiate]

Re: 2005 Yamaha 70Hp BETOL wont start

OK, I did soem fiddling I now have spark, but it wont fire even with NOS, will clean fuel lines out and try again from scratch...

 

[xfixiate]

Re: 2005 Yamaha 70Hp BETOL wont start

OK, I did soem fiddling I now have spark, but it wont fire even with NOS, will clean fuel lines out and try again from scratch...
... there is a loud siren coming from the displays when i have ignnition on, is this normal?

 

[99yam40]

Re: 2005 Yamaha 70Hp BETOL wont start

no it is not normal unless the oil level is low or the temperature overheat switch is closed showing high temp

What did you find on the spark?