225 Ocean Pro Hi Idle problem

[Bluesail661]

Can anyone tell me why my 1998 225 might not idle below 1200rpm's?

Just had the upper bearing replaced as the motor took a swallow of water in the bottom end and shot water into the upper bearing and the upper bearing and housing got wiped out. This has been replaced and the top end put back together. The motor runs really well but refuses to idle below 1100 or so.

Checked all that was done up top and neither the stator nor the timer base was disconnected for this repair. They were simply held aside and then reinstalled when the upper bearing housing was replaced.

Since that repair, the motor will not idle. It does not seem to be mechanical but more electrical. Checked all the connections to the power pack etc and they all look OK with no corrosion. All the mechanical linkages and timing adjustments were as before.

What could I be missing? Could the quick start be causing this? Can I disable the quick start to test if it is causing it? I have reviewed the wiring schematic but find no reference to a quick start circuit. This is not a fuel injected motor.

Any ideas?

Thanks in advance.

Chuck

 

[daselbee]

Re: 225 Ocean Pro Hi Idle problem

Just had the upper bearing replaced as the motor took a swallow of water in the bottom end and shot water into the upper bearing and the upper bearing and housing got wiped out.

Huh?
I do not understand this explanation of the failure.
Please elaborate.

 

[Dhadley]

Re: 225 Ocean Pro Hi Idle problem

Is it in the water or out? If it's out of the water it may not idle below 1100. When it starts it may idle about 1400 and then as it comes out of Quick Start it'll drop to 1100 or so.

 

[CharlieB]

Re: 225 Ocean Pro Hi Idle problem

A gulp of water inside a motor may have cause an intake or crankcase leak, a lean idle on any cyl's would raise idle speed.

Spray intake gasket and crankcase parting lines with chemical while at idle to see if idle speed changes, indicating a leak.

 

[Bluesail661]

Re: 225 Ocean Pro Hi Idle problem

Here is the long version of the story...

The motor siezed over the winter due to water in #5. I was able to free it up and get the motor running but I could not figure the cause of it.

Got the boat in the water and noticed water weeping out of the gasket between the powerhead and the exhaust housing. It did not seem to be much but it looked like it had been leaking for some time.

While taking a test run down river to fill the fuel tank, the motor ran really well. On the way back, it coughed and shut down while on plane and we coasted to a stop. When I removed the engine cover, I discoverd that with the water had filled the engine housing and was over the hole in the gasket and we had once again put water into #5 and the reason for the 1st issue.

I removed the spark plug and discoverd that #5 did in fact have water in it and I waited for a tow in. I shot some fogging oil in the piston to prevent it from rusting and cranked it over. It seemed locked up. It was later that I discoverd that the top bearing had just come apart.

When I got the boat back home, I removed the power head and brought it into the shop. I pulled the flywheel, unbolted the stator and timer base and moved them out of the way without disconnecting them. I pulled the upper bearing housing to find the bearing and simply come apart. Lots of chewed up bearings and housing parts in the top end.

I carefully removed the spent bearing and all the loose parts and used a maganet to remove all the fine shards. The crank had taken some damage and had some gouges/dings it it. I was able to polish these out with a hone and some emery cloth.

I reinstalled the new upper bearing assembly and reinstalled the timer base and stator. Reinstalled the flyweel and connected the timer linkage. I was careful to make sure the wires were in their clips but did not rub on the timer base.

All looked as it should and I replaced the gasket between the power head and the exhaust housing, reconnected all the plugs and harnesses as well as the linkages.

Put the muffs on the motor and she started right up. Let her warm up to temp but was not able to get her to idle down and the reason for my post.

Thoughts?

 

[Dhadley]

Re: 225 Ocean Pro Hi Idle problem

So we're running the motor out of the water. In that case the idle may well be at 1100 when out of Quick Start.

This is assuming all 6 carb butterflies are completely shut, the motor is running correctly and you are trying to set the idle with the adjustment rod coming off the timer base and not with the screw in the throttle arm.

 

[Bluesail661]

Re: 225 Ocean Pro Hi Idle problem

Yes,

The motor appears to be running correctly. The butterflys are all down and in fact, when I pull gently on the carb linkage, the RPMs will drop slightly but not very much. This is with the carb idler not influnced by the linkage. In other words, I am not fighting the idle adjusment screw on the linkage. Adjusting the timer base linkage seems to have no effect other than to increase the RPMs or make it run rough.

If launching the boat is it, I am done?

Chuck

 

[Bluesail661]

Re: 225 Ocean Pro Hi Idle problem

So simply exahust back pressure is the answer? That will load the engine enough to pull the RPM's down to normal?

OK, that makes sense. Thought for sure I missed something.

Thanks,

Chuck

 

[Dhadley]

Re: 225 Ocean Pro Hi Idle problem

It could be that simple, yes. We're not really following your description in your post about pulling on the carb linkage and the r's coming down slightly. Nor about the "carb idler" and the "idle adjustment screw on the linkage". Once the butterflies are all seated the idle is set with the timer base adjustment. The screw in the throttle arm on the side of the block should not be moved when setting the idle. If the linkage is set properly you should not have to pull on anything.