Suzuki 4 Stroke 70 problem

I have an intermittent fault on a Suzuki 70 which has done about 150 hours in just over a year. Its been looked at by two marine mechanics after letting me down and today the same issue happened for the third time.

The following scenario is consistent with all three failures:

A longish run (around an hour) out to a fishing spot. Boat anchored and motor turned off for an hour or more. When trying to restart the motor it behaves as thought the shift lever is not in neutral and therefore no power. Repeated jostling of the shift lever does eventually get it the system to know its in neutral and the motor starts BUT soon cuts out as if there is fuel starvation. It will start repeatedly and run for 5 or so seconds before cutting out.

Both mechanics have been sceptical that the shift lever neutral issue is related to the engine stalling but the same thing has happened three times. I have had the boat out a number of times between these failures with no issue at all.

The motor starts and runs without issue from cold the following day.

Any ideas?

z00m's picture

Posts: 828

Date Joined: 10/05/14


Sun, 2017-06-18 10:21

 Do you think the jostling actually resolves the starting issue or could it just be the passage of time?

Could it be an issue with the dead man switch? Could it be an issue with the ignition switch istelf?

When the dealer plugs it into the computer are there any codes in the history that could shed some light on it?


Posts: 84

Date Joined: 29/10/12

I had a similar problem.

Sun, 2017-06-18 13:00

My 200 Suzuki stalled on me a few times. Only 300 hours on the clock. Once in gear at idle and the other time at around 4000 rpm which wasn't fun. Had it looked at during the service and they came up with a dirty fuel filter. Thinking all is well now but it started to be sluggish at starting. Batteries replaced and still the same. Not long after this my engine had a major failure. Went up on throttle one day leaving the north passage in Coral Bay and it took longer than normal to get up on the plane and once on the plane it didn't sound normal. Throttle backed only to have oil pressure warning and buzzer sounding and engine shutdown. Got the boat back on land and pulled the dip stick to witness emulsified oil (milky colored oil). Motor was stripped down and found both head gaskets had let go on both heads. This didn't just happen but it was slowly happening over time due to the corrosion that was evident on the main bearings and other components. In my opinion the stalling was the start of the problem with water seeping through somehow into the combustion area. Don't mean to scare you but this is what happened to my engine.

My mate also had an intermittent problem with starting/running and it turned out to be his safety cutout switch. Maybe try jiggling that around first while the engine is running and see if it cuts out. Otherwise check your fuel filter also and maybe check the color of your oil just in case.

PM me if you want to know anything else.


Posts: 47

Date Joined: 01/03/14

Thank you

Sun, 2017-06-18 14:16

for your comments. The buzzer sound that should come on when you turn the ignition switch doesn't when the system believes the lever is not in neutral. Could be the dead mans switch that's intermittent. I will mention all the thoughts to the agents when it goes in this week. Will let you know if the issue is resolved.

Posts: 84

Date Joined: 29/10/12

 Which service centre are you

Sun, 2017-06-18 14:30

 Which service centre are you taking it to?

Posts: 47

Date Joined: 01/03/14

PM sent

Mon, 2017-06-19 16:03

PM sent

Posts: 84

Date Joined: 29/10/12

Received an email

Wed, 2017-06-21 10:11

 but nothing in my inbox here so couldn't reply. Weird. 

Flaminghedgehog's picture

Posts: 34

Date Joined: 19/04/15

This might be worth a look.

Mon, 2017-06-19 08:20

Posts: 47

Date Joined: 01/03/14

Intesting read.

Mon, 2017-06-19 16:05

Thanks for taking the trouble to send me the link. I have forwarded it on to the marine mechanic.

Posts: 601

Date Joined: 09/10/06

 Hey Joe. Ask your question

Sun, 2017-06-18 20:06

 Hey Joe. Ask your question over at


Posts: 47

Date Joined: 01/03/14

Wii do

Mon, 2017-06-19 16:04

Thanks Holth.