2000 Johnson Ocean Pro 150hp Idle a little High

[erols]

Hello. New to forum. Have read many threads and you all have helped me many times. I have a 2000 Johnson Ocean Pro on a 18 ft. Four Winns Horizon. Performed some maintenance this spring. Changed water pump, went OK. Changed plugs Champion QL78YC gapped at .30". Performed Link and Sync. I have an OMC analyzer. Timing at 5 degrees ATDC at Idle. Pulled #1 and #6 carbs and inspected. very clean no debris or sludge. reinstalled. Have not rebuilt carbs. Always drain gas from tank every year using universal fuel pump hooked up at engine connection. Always use Carbon Guard. Have not checked compression. Idle screws set at 5 1/8 turns out. Engine pretty much original no major repairs. No rust or rot inside engine compartment. Idle at 1100 to 1200 in neutral on Muffs in driveway. Right now starts OK seams to run OK. I am no marine pro.

WOT RPM at 4600 boat speed at 43MPH 141/2 X 19 Prop
Tach does not read exactly 0 when key turned on, sits at about 25RPM
Can this be adjusted at all???
Also is there any way to increase WOT RPM and speed???
Would like to be at 5000RPM

My main issue is Idle in water in gear is at about 850 to 900RPM
Everyone here says it should be 650 to 700RPM
Do not seem to seem to notice allot of difference adjusting idle screws in the water. Maybe I just don't have the touch. Can not seam to get it lower than this. Can anyone help??? What am I missing or doing wrong???
Just want it to be as good as possible.Thank You.

 

[jonesg]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

Hello. New to forum. Have read many threads and you all have helped me many times. I have a 2000 Johnson Ocean Pro on a 18 ft. Four Winns Horizon. Performed some maintenance this spring. Changed water pump, went OK. Changed plugs Champion QL78YC gapped at .30". Performed Link and Sync. I have an OMC analyzer. Timing at 5 degrees ATDC at Idle. Pulled #1 and #6 carbs and inspected. very clean no debris or sludge. reinstalled. Have not rebuilt carbs. Always drain gas from tank every year using universal fuel pump hooked up at engine connection. Always use Carbon Guard. Have not checked compression. Idle screws set at 5 1/8 turns out. Engine pretty much original no major repairs. No rust or rot inside engine compartment. Idle at 1100 to 1200 in neutral on Muffs in driveway. Right now starts OK seams to run OK. I am no marine pro.

WOT RPM at 4600 boat speed at 43MPH 141/2 X 19 Prop
Tach does not read exactly 0 when key turned on, sits at about 25RPM
Can this be adjusted at all???
Also is there any way to increase WOT RPM and speed???
Would like to be at 5000RPM

My main issue is Idle in water in gear is at about 850 to 900RPM
Everyone here says it should be 650 to 700RPM
Do not seem to seem to notice allot of difference adjusting idle screws in the water. Maybe I just don't have the touch. Can not seam to get it lower than this. Can anyone help??? What am I missing or doing wrong???
Just want it to be as good as possible.Thank You.

Idle speed is adjusted by the ignition timing.
Not familiar with yours as mine is a 1994.
I have the same size prop and get 5K+
Idle can also be too high due to air leaks making it run lean.
But if you don't sense air leaks or fuel leaks I would try the timing.
A compression test would help, in case a gasket is leaking on the head, that will cause high idle...I think.
Maybe its time your order a service manual from a dealership, get the real manual, not haynes , clymer or seloc.

 

[Chris1956]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

A 17" pitch prop will probably get you to about 5K RPM at WOT. The boat speed may or may not increase.

I have a 21' SeaSwirl bowrider, with a 19" pitch prop, and see about the same performance and RPM with my '98 Johnny 150HPV6.

 

[erols]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

Have Johnson shop manual for my model
Thanks..

 

[jonesg]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

Its missing some serious rpm somehow.
Did it ever run faster?
I would do a compression check and rebuild all carbs with new kits.
Then a spark test and set the ignition by the book.

 

[erols]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

Have Johnson manual and OMC analyzer.
rechecked timing and link and sync yesterday.

Timing at 6 degree ATDC at idle. Set WOT timing to 20 degrees BTDC.
Per the book.

All throtle plates closed at idle. timing base and throtle plates start to move at same time.

Starts good, runs good. Boat might have done 47mph empty when brand new 10 years ago.

To do compression check. Warm engine remove ALL plugs. Hook up tester and crank engine for aboat 5 or so seconds for each cylinder??? correct???

I will try if this is correct. what numbers should I expect??? on 10yr old engine.

Carbs appear just to clean to rebuild unless there are air leaks.

 

[SparkieBoat]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

you are over working your motor with that prop, you should probably go to a 15 pitch prop, I try to get my boats to at least 5500 RPM @ WOT, unloaded.

 

[erols]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

What about diameter???
Keep the same???

It is 14 1/2 right now

How does diameter change things???
Thank you

 

[jonesg]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

As I stated previous, I have the same prop and get 5K+.

Something else is going on, changing the prop will lead to some other problem unless its tracked down.

 

[SparkieBoat]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

same diameter is fine...as Jones mentioned if you have any problems with the engine changing props is not the answer, but if engine is running at full power you should reprop. did motor ever turn this boat any faster??

 

[erols]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

Thanks for replies all information useful.

Checked compression today. Again, I'm no pro but I got
90 to 95 PSI on all cylinders. Is this a good number for this engine???
I know the +/- percent difference is the more important issue but,
I have never done one before so I have nothing to compare to.

I have no idea what the compression was when it was new.

Did spark test also spark jumped 7/16" on all cylinders.

But on a double check after compression test the battery started to run down and the sparks were erratic. is this normal???

Anyway this is my second prop but I think I ordered the same type as the original as I remember, except this is a turning point 2 piece prop.

When the boat was brand new it ran at about 47 mph and there was less stuff in the boat. I can not remember what my WOT RPM's were at that time.

The boat was brand new so i never looked.

 

[jonesg]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

Your compression is good.

Spark test requires a fresh fully charged battery.
Sounds like your spark test was good anyway.

I would try choking it briefly when running wot, just bump the key to see if it picks up or bogs down.

With good compression and good spark, the next step is link and sync, timing and then fuel delivery ( carbs etc.)
Theres nothing else it could be at this point.

 

[erols]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

Thank you

When I started,
I was doing the spark test on the cylinder I was doing the compression test on, and got a spark on every revolution.

I noticed at the end when I double checked the spark test. I was doing that test with all plugs out. I did not always get a spark on every revolution
Is this because the battery was wearing down???

It is a new battery this year.

 

[erols]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

I will try the choke bump test this week. and post results.

What should happen??? Bog down I assume!!!

Will also start looking for a 17 or 15 pitch prop.
What does everyone suggest???
If I am at 4600 to 4700 RPM now.

17 should bring me up to 5000 to 5100 rpm. Is that good enough???

Or do I need more RPM???

And go with 15 pitch.

Thank you for the help i appreciate it!!!!!

 

[erols]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

2 more things.

While I have the help.

After removing plugs on muffs in driveway at idle should plugs be moist or dry???

And how about after running at full speed on the water.

same question.

The temp in driveway running on muffs at idle goes up to 160 degrees and stays there steady.
Is this normal???
How should temp react on water??? I was kind of watching it last week end
I believe it was at about 125 degrees.
Should it fluctuate much while in the water i.e. go up at idle
and go down while under way.
Thank you!!!

 

[SparkieBoat]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

temp seems fine..you have lost about 4 MPH since it was new. this could be a result of more weight being in the boat.. I would also recommend a visual inspection of the carbs..remove cowl and carb cover..let someone drive boat at WOT and look for even spray pattern..also make sure that no carbs are throwing fuel out..do not run your motor for an extended period of time with carb cover off, replace it after inspection. I recommend WOT RPM to be around 5500

 

[erols]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

thank you!!!
should plugs be moist or dry??? when you pull them.

in driveway on muffs???

in water after normal driving???

 

[SparkieBoat]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

moist

 

[jonesg]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

Charge the battery and do the spark test again with all plugs out, a few cranks is all it takes to know.

If fuel flow is good the engine should bog down when the key is bumped,
if it picks up rpm then theres starvation going on.

If you don't own a timing light buy a cheap one at autozone and use it on the water to make sure its firing on all cylinders when fully warmed up and running under way , sometimes a coil will drop out when hot.

Go to the prop forum and ask about your prop, I say you're missing well over 1000rpm with that prop....unless its seriously bent, its capable of turning a lot higher.

 

[ted41]

Re: 2000 Johnson Ocean Pro 150hp Idle a little High

where are these idle screws could you explain or better send a pic