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30 HP HONDA 4 STROKE GOING INTO LIMP MODE

T

Time4war

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ANYONE WITH HELP HAD BOAT AND MOTOR INTO 2 DIFFERENT MECH BOTH SAY THEY HAVE TAKEN IT OUT AND HAVE HAD IT RUNNING IN THE WORKSHOP AND NOTHING MOTOR HAS NO MORE THAN 30 HOURS ON IT
 
Hi,
My first thought is more of a question really....
.....is it actually going into limp mode or could it be that it's possibly dropping a cylinder intermittently?


Check your emergency stop and ignition switch.

Check all connections to the ignition coils.

If that seems OK and connections are clean and tight,
I suggest trying a new set of NGK spark plugs making sure that they are properly gapped and each plug boot has a thin coating of dielectric (tune-up) grease around the inside edge to seal out moisture.

I have seen spark plugs be bad when new right out of the box and cause problems. Likely because they've been dropped or mishandled. It's really the cheapest "guess" you could try as far as throwing parts at the problem.

Other items that might cause similar symptoms might be:

Fuel tank vent not staying fully open or clogged.

Fuel line quick connect not properly connected and latching.

Accessory add-on water separator not functioning or leaking.

Poor fuel quality.


If it won't screw up consistently, that makes it extra difficult to diagnose. As I'm sure you probably already know.

If it is going into limp, it should reset and run ok...albeit temporarily...after shutting down briefly. That could be an overheat condition and that might be a thermostat sticking. They too aren't always reliable even when new.


Hope you find it.

Good luck.
 
jgmo said:
Hi,
My first thought is more of a question really....
.....is it actually going into limp mode or could it be that it's possibly dropping a cylinder intermittently?


Check your emergency stop and ignition switch.

Check all connections to the ignition coils.

If that seems OK and connections are clean and tight,
I suggest trying a new set of NGK spark plugs making sure that they are properly gapped and each plug boot has a thin coating of dielectric (tune-up) grease around the inside edge to seal out moisture.

I have seen spark plugs be bad when new right out of the box and cause problems. Likely because they've been dropped or mishandled. It's really the cheapest "guess" you could try as far as throwing parts at the problem.

Other items that might cause similar symptoms might be:

Fuel tank vent not staying fully open or clogged.

Fuel line quick connect not properly connected and latching.

Accessory add-on water separator not functioning or leaking.

Poor fuel quality.


If it won't screw up consistently, that makes it extra difficult to diagnose. As I'm sure you probably already know.

If it is going into limp, it should reset and run ok...albeit temporarily...after shutting down briefly. That could be an overheat condition and that might be a thermostat sticking. They too aren't always reliable even when new.


Hope you find it.

Good luck.
Click to expand...
HEY THANKS FOR YOUR REPLY THE MOTOR IS NEW ONLY ABOUT 30 HOURS ON IT BOUGHT IT MARCH APRIL LAST YEAR WHAT HAPPENS IS I USE IT FOR FISHING THE LAST TIME I PUT IT IN AT THE RAMP HAD IT IDELING WHILE I GOT MY LURES ON RODS HEADED OFF TROLLING FOR 20 MINIUTES DOING NO GOOD SO WANTED TO GO UP FURTHER BUT IT WOULD NOT PICK UP THE TIME BEFORE WAS AT A DAM SET OFF ACCROS TO THE ROCK WALL ABOUT 500 METERS GOT THERE WAS TROLLING LURES HAD GONE ABOUT ANOTHER 500 METERES NOTHING SO WENT TO GO ACCROSS THE OTHER SIDE TO AN OLD CREEK HAD GONE ABOUT 800 METERS MAYBE A BIT FURTHER AND IT STARTS LIKE DYING OR GOING INTO LIMP MODE SO HAD TO HEAD BACK IN BETWEEN BOTH TIMES ITS BEEN TO THE MECH THEY TELL ME THEY TAKE IT FOR A RUN ON WATER BUT I HAVE NO IDEA IF THEY HAVE OR ARE JUST RUNING IT WITH MUFFS ON AT THE SHOP BUT IT DRIVES ME MAD
 
Yeah,
I hear you....super frustrating.

But, I gave you some of my best guesses.

I stole the phrase NEW stands for Never Ever Worked because it's true. They leave stuff loose at the factory sometimes.
I even opened a bagged, brand new carburetor float bowl one time and it had a bunch of the casting sand from the foundry packed inside the passages!
Hard to believe but it happens.

It could even be a loose wire connector or a bad ground. But finding something like that is a tedious, time consuming effort.

Hopefully one of the other guys here has better ideas. There a several very smart and knowledgeable members here.
 
jgmo said:
Yeah,
I hear you....super frustrating.

But, I gave you some of my best guesses.

I stole the phrase NEW stands for Never Ever Worked because it's true. They leave stuff loose at the factory sometimes.
I even opened a bagged, brand new carburetor float bowl one time and it had a bunch of the casting sand from the foundry packed inside the passages!
Hard to believe but it happens.

It could even be a loose wire connector or a bad ground. But finding something like that is a tedious, time consuming effort.

Hopefully one of the other guys here has better ideas. There a several very smart and knowledgeable members here.
Click to expand...
thanks anyway
 
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