Can't go over 2500 rpm's?

macojoe · #1 07-21-2008, 06:25 PM

Ok we got the shifter fixed, works like a charm!!

Now its time for the next issue!! Can't get more the 2500 RPM's on the motor when in the water in gear under a load??

We did a compression test, fine in all 6, Great spark in all 6, Motor starts and runs when 3 plugs are unplugged on left, and starts and runs when 3 plugs unplugged on the right.

BS and I are sure it is electric something, but WHAT??

Any Ideas guys??

Thanks!

phester · #2 07-21-2008, 06:40 PM

maybe when fixing the reverse linkage something got out of adjustment w/ the throttle linkage [???] or the timing advance linkage?

macojoe · #3 07-21-2008, 06:41 PM

O yea, Motor 1986 225 HP Evinrude Mod E225TXCD Serial B1146525

tsubaki · #4 07-21-2008, 07:07 PM

So this is a different motor than the one that was on the boat last week, correct?
Your signature reflects an '87 and this one is an '86.
Has the VRO been gutted? Knowing you, yes.
The parts catalog brings the model up as E225TXCDA if that matters.
Like BS was saying, not sure about the low oil - low rpm safety thing, what year it was implimented but seems to me it was the first year they came out with the VRO system.
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Today, 05:01 PM
BY bigshrimpin

God
Join Date: Mar 2003
Location: Davis, CA
Posts: 1,270

Well . . . the shift problem is fixed!! Now onto the the next problem . . . the motor won't go above 2500rpm in gear (with a load). I think it's probably the stator, but I'm no OMC guru. I believe the motor is an 86 or 87 and slow mode didn't happen till 1988/89??? any suggestions. There is decent spark on all 6 clylinders when cranking, and compression is even in all 6. We pulled plug wires on one side and the motor will start . . . and then we did the same on the other side and the motor started, so I don't think it's a power pack. Linkage is advancing through the full range of motion. I'm 100% sure it's electrical, but I'm not sure what else to try beside breaking out a multi-meter and going through each component.
Last edited by bigshrimpin : Today at 05:07 PM.
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My '84 had the capability to change to dual fuel pumps but from '86 on out I don't see that option.
I'm not sure how to defeat the VRO system and use the fuel pump disconnected from the oil pump.
It sounds like the VRO system is actually working and preventing it from running over 2500 rpms.
You have an almost identical motor to compare to.
That year model had a remote mounted reservior for the oil, is it possible to have a pair of wires that need connecting to simulate a full tank of oil?

bigshrimpin · #5 07-21-2008, 08:05 PM

Quote:

Originally Posted by phester

maybe when fixing the reverse linkage something got out of adjustment w/ the throttle linkage [???] or the timing advance linkage?

I wish it was that, but it's definitely get full advance from the linkage.

macojoe · #6 07-21-2008, 11:38 PM

Quote:

So this is a different motor than the one that was on the boat last week, correct?

Nope same motor, just got the numbers off and looked it up to make sure what it is, and 86 is the deal. And yes VRO is gone long before I got the motor.

Thanks

bigshrimpin · #7 07-22-2008, 07:22 AM

http://www.outboardignition.com/page32.asp

S.L.O.W. ***8211; Speed Limiting Oil Warning system. Limits the RPM of the engine to approximately 2500 RPM in
order to reduce the damage to the engine caused by a no oil or overheat condition.

Engines with S.L.O.W.
Engine will not rev beyond 2500 RPM:

1. Use a temperature probe and verify that the engine is not overheating.
2. Disconnect the tan temperature wire from the pack and retest. If the engine now performs properly, replace the temperature switch.
3. Make sure the tan temperature switch wire is not located next to a spark plug wire.

macojoe · #8 07-22-2008, 12:09 PM

Just back in from the water, Same thing

Won't go over 2500??

Disconnected the tan wires and it had no effect

Oils has been disconnected for years so I am sure there is nothing there.

Tied to a empty mooring and cked things out, motor starts and runs great, raced the engine in neutral and it gets full throw and full rpm's, but as soon as you put in gear and load up the motor its still at the 2500??

Why is it for the last few years I get half way threw the season and bam I get screwed??

nymack66 · #9 07-22-2008, 12:41 PM

Please check for spark on all cylinders, Double check all connectors to your packs; Looks like you are running on 3 cylinders not 6 may be one pack is blown. You will have to test will find it. Also observe the movement of the advance (under fly wheel) make sure it moves freely back and forth. Ferm, Skool where are you guys ? Help !!

macojoe · #10 07-22-2008, 01:52 PM

Spark ok on all 6 plugs, all connectors are good, all linkage is moving to there stops, throttle, timing advance, and choke.

Talked to skools on the phone 1 hour ago, he thinks wire harness, or stator?? But says to do the wire harness first as I have some issues there.

I have a brand new harness for the boat side, and BS is going to bring me the motor side. But I have to wait for Friday for him to get here. That's ok going to blow tomorrow and rain all day Thursday.