Logo
FULL SITE MENU

65 hp mercury wont start

G

geo436

New member
"hi guys, i have a 65 horse me

"hi guys, i have a 65 horse merc that doesnt get spark, i replaced the cdi and coil, and when the key is turned the coil should be getting juice right? mine doesnt anybody have any ideas on what it could be? Thanks"
 
"George, you have me a little

"George, you have me a little confused here. A 65 Merc (model 650) was built in the 60's and 70's and preceeded Merc's cdi ignition (experiment) by a good few years.

The 4 cylinder 650's had a distributor and the 3 cylinders had early Thunderbolt ignitions.

Or are you talking about a 65 Jet? However, even the 65 Jet is nothing more than a 90 Merc powerhead, with a Thunderbolt 4 ignition and jet lower unit....

What is your serial number??"
 
"George, that is a 1972 Canadi

"George, that is a 1972 Canadian built Merc. I may be off by a year back or forth, the records are pretty sketchy from Merc in Mississauga.

And yes, the ignition on these is quite similar to a car of the same vintage. Unfortunately, almost none of this ignition system is available.

A common problem on that style after all these years is the rotor.

However, I will have to defer your particular issue to someone else on the board here. That ignition is something that I personally wouldn't even try and tackle for someone (and don't so I have zero experience trouble shooting). It's way too difficult to find parts and would cost more than the motor is worth to work on.

So, fine for a personal project, but definately wouldn't recommend looking to a shop for help with that one.

Get yourself a Seloc's manual covering your model and year and pick at it..."
 
"Hi George,


You getting

"Hi George,


You getting power to the dizzy from the stator? Is there any spark on the coil before going to dizzy?

Power comes from stator to dizzy [points], to coil then back to dizzy [rotor] that distributes spark to plugs.

Check dizzy cap for cracks, wear and the carbon pin that should bring spark in from the coil to rotor. If it's worn or stuck, spark will stop in it's tracks right there. Rotor shaft could also be worn, running eliptically. Rotor and cap needs to have close clearances to transfer spark.

I'd start at the stator first. The dizzy and coil could be brand new but be useless without juice.

What about control box and ignition switch wiring and contacts? All clean and sound?"
 
Back
Top