Suzuki 70 4 stroke - Intermittent problem

 One of my twin Suzy 70's has an intermittent issue and I am hoping someone can point me i- and the agents - in the right direction.

 

Today the motor started and ran well initially - freo to Rotto including the the odd drift when the motor was off. After a couple of drifts the motor refused to even turn over - sugesting no power or faulty neutral switch. So lifted the motor out of the water and started the limp back on one motor. After about 30 mins tried the motor again and this time it turned over, started and ran at 4000rpm for about 30 seconds before cutting out and once again not even turning over. This happened again after another 30 mins. After about 90 mins tried it again. All good running at 4000rpm loops off the sailing club for 15 mins.

 

Much the same happened  the previous trip. Took it to the Suzuki agents who changed the fuel pressure valve and tested it in a tank without error. Clearly this did not adress the real issue. Internittent issues can be difficult so no issue with the agents.

 

Any ideas as to what may be causing these symptons?


Posts: 34

Date Joined: 06/10/13

? White wire failure

Sat, 2022-06-25 21:45

It sounds a bit like "white wire failure"

The first sticky on Suzuki Outboard forum may be worth a read

 

https://www.suzukioutboardforum.com/forum/general-discussion/suzuki-outboard-parts-forum/5503-white-wire-power-failure

Brody's picture

Posts: 1018

Date Joined: 06/02/07

 Definitely have a look at

Sun, 2022-06-26 15:09

 Definitely have a look at your white wire. Might not be the issue but well worth a look regardless.

Posts: 92

Date Joined: 01/03/14

 Thanks for that. Will check

Sun, 2022-06-26 15:58

 Thanks for that. Will check it out.

Mitch Westy's picture

Posts: 29

Date Joined: 16/07/19

Wiring

Sun, 2022-06-26 19:53

 I had a similar problem on my Merc which turned out to be a corroded main negative cable connecting to the motor. If you have a multimeter test the resistance of the main positive and negative wires from the battery to their connection on the motor, should be under 1 ohm. Next time it happens pull the cover off and see if you can start it by bridging the starter motor trigger wire (make sure it's in neautral and the key is on). If that works you know it's something to do with your control box. Always good to clean all your main positive and negative connections on the battery and motor to rule that out too. I went down the path of thinking it was my neutral switch so I pulled all the control box apart to then find out it was my main negative connection. Much easier to start there.

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Mitch Westy's picture

Posts: 29

Date Joined: 16/07/19

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Sun, 2022-06-26 20:27

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Mitch Westy's picture

Posts: 29

Date Joined: 16/07/19

Glitch uploaded 3 times 

Sun, 2022-06-26 20:26

Glitch uploaded 3 times 

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Posts: 92

Date Joined: 01/03/14

Update

Thu, 2022-06-30 09:42

Got the mechanic to take a look yesterday. Swapped the computers on the motors in an attemp to see if the fault was replicated on the port motor. Spent two hours doing sea trials and both motors purred like kittens. Go figure?

 

I have a trip to the Mackerel Islands planned for August and need to get to the bottom of this.

 

Thanks for the suggestions so far. I will keep the thread updated.

Posts: 183

Date Joined: 08/09/11

Suzuki 115,

Thu, 2022-06-30 21:30

 Had some wierd goings on with my motor, pulled the control box apart to chech the neutral switch, nothing wrong there, eventually found the neutral switch at the motor, activated by the gearshift rod, was partially broken.

Sixty dollars and 20 minutes fixed the issue.

Might be worth a look, if the smaller motors have the second neutral switch.