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LarrySherman posted 09-09-2001 10:26 PM ET (US)   Profile for LarrySherman   Send Email to LarrySherman  
Now the Johnson "2-thirsty-5" (I do like that!) won't stop. I took my wife and daughter for a ride, came back in, and turned the motor off.

Except, it did not stop. I pulled the key out, and it was still running. I shut off the fuel valve, and let it drink itself to death.

Has anyone seen this before?

Also, where can I get parts for this motor? I need plug wires desperatly!

Thanks, Larry

lhg posted 09-09-2001 11:56 PM ET (US)     Profile for lhg    
Isn't that a condition referred to "dieseling" or "detonation"? I believe the cause is either ignition timing, or carbon build up in the heads, which gets red hot and keeps firing the cylinders.

Maybe one of our engine experts has a better explanation.

Tom W Clark posted 09-10-2001 12:28 AM ET (US)     Profile for Tom W Clark  Send Email to Tom W Clark     

I don't know what your problem is but I would suspect something funky in the ignition switch or the wires connecting to it rather than dieseling.

If you can't get parts locally you might try SeaWay Marine Inc. 206-937-7373 They specialize in mail order parts for old motors and if they don't got it, it don't exist.

Clark Roberts posted 09-10-2001 06:08 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Larry, I think Tom is on the right track! If it does it again, try to shut down via kill switch and if it doesn't stop you may have a bad common ground connection! Good luck.. Clark... SCN
Lil Whaler Lover posted 09-10-2001 06:29 AM ET (US)     Profile for Lil Whaler Lover  Send Email to Lil Whaler Lover     
I agree that it is probably not dieseling. What does the rpm do when it happens? If it does not slow down it is not likely to be dieseling. If the rpm's drop very low (meaning way below a normal idle), it may be dieseling. If it is dieseling, try putting it in gear to shut it down quickly by putting a load on the engine. I have seen this recommended many times for 4.3 L outdrives where it can be a way of life. Clark, have you ever heard of this method of stopping it quickly? Dave
bigz posted 09-10-2001 08:32 AM ET (US)     Profile for bigz    
Another suggestion would be to replace the complete ignition switch Larry. I am sure it is original, the contacts are the first thing I would suspect since it hasn't occurred until now, further it has been subjected to a long period of non-use. They do corrode and just plain wear out!

Go to any OMC dealer for the wires and get a set direct if not in stock. The local OMC warehouse is in N. NJ, about a standard rate UPS next day, if order placed by noon, to CT.

LarrySherman posted 09-10-2001 09:38 AM ET (US)     Profile for LarrySherman  Send Email to LarrySherman     
Wow! As usual, I am amazed at the amount of knowledge here. Thanks guys.

I put in a new ignition switch in July, but used the old wiring. I'll check that over and look into the common ground as Clark suggests. I think this is the "M" lead if I remember correctly.

I'm also going to order new plug wires and a card rebuild kit from seaway.

Thanks again guys. Larry

LarrySherman posted 09-10-2001 01:13 PM ET (US)     Profile for LarrySherman  Send Email to LarrySherman     

Tom is on the money about Seaway. Great people there. I ordered carb rebuild kits, another power pack and plug wires. Less then $200 for the whole order.

He also had wire harnesses for it, but I held off.

Thanks Tom.

Peter posted 09-10-2001 01:47 PM ET (US)     Profile for Peter  Send Email to Peter     

If your ignition system is equipped with a safety lanyard, try using that to kill the engine. I've never heard of a two cycle dieseling.

SuburbanBoy posted 09-10-2001 02:17 PM ET (US)     Profile for SuburbanBoy  Send Email to SuburbanBoy     
I would guess that there will be current draw from your battery if your switch is not actually disconnecting the ignition. Does your battery run down? Do you know how to test the system for current draw? You might have additional electrical problems. For Safety, disconnect the battery when you perform any work.

Good luck and keep us informed,


LarrySherman posted 09-10-2001 02:35 PM ET (US)     Profile for LarrySherman  Send Email to LarrySherman     
I have a link 10 battery system monotor. No drain whatsoever. I'm going to go over the wiring tonight. I'll find the culprit....

PS: There is no saftey lanyard, but after reading the thread in the general section, I wish there was one! I'm going to rig one up.

Bigshot posted 09-10-2001 05:06 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Karry, 2 strokes do not diesel. You have a wire that is hot(not losing power) somewhere. Ask the mechanics who worked on it unless it worked fine all day until the end, etc. It is a simple fix.
John from Madison CT posted 09-11-2001 12:29 PM ET (US)     Profile for John from Madison CT  Send Email to John from Madison CT     

Whewwww ! Seems you got your hands full with that 25' Whaler. Perhaps it's time to take the hit and get a new motor with harness, controls etc. etc.. At some point you can go nuts. I know, I've been there many times.


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