What's wrong?

[Wayne.McC]

Johnson Seahorse 10 HP QD-19 1958.
First I found what I thought was the fuel ratio as 24-1, even if not correct I figure i should be able to start and run. I have a pressured tank in the 6 gal. The motor started and ran ok at idle but not much in the way of power. I looked at the plugs and they where both wet. I thought, ok the float may be stuck from sitting for years. I rebuilt the carb, new float cleaned ports and jets adjusted the slow speed to 3/4 turn out high speed 1 1/2 out. Now it starts and runs the same, wet plugs.
The old plugs are AC M44C The new plugs are NGK J6C either plug not much change.
Question:
Could the condensers be week or leaking voltage to ground some where or do they just quit?
Or do you have another thought that I may go on?

 

[kbait]

Re: What's wrong?

You likely need to scrutinize the magneto/ignition. Here's a comprehensive posting in 'top secret files': http://forums.iboats.com/showthread.php?t=531940

 

[82rude]

Re: What's wrong?

Check the ign system closely,since you didnt say that you changed points and coils yourself its very possible that the orginals are in there.If orginal its time for a change, trust me.Ive worked on lots of old omc,s and ive literally crushed the coils in my hand after taking out from some motors ,yet the engines still ran up to that point though not well.Do yourself a huge favor and get the proper champion spark plugs .OMC,S love champions and basically hate everything else.How are you testing the motor ?In the barrel will get you a baseline but in the water is where you fine tune the motor.The slow speed jet is just that, SLOW SPEED,once you start appling more throttle adjust the high speed jet,since your at 1 1/2 allready id say adjust slowly in.24:1 is correct.

 

[Wayne.McC]

Re: What's wrong?

Thank you,
I think I will try the timing first since that is the cheapest right now. I did print the timing procedure, I'm an Industrial electrician by trade so I have the meter. I have a hunch that all may work out well in a few days and one pay or so. I didn't notice the timing marks on the flywheel, I will also be preforming a compression test. I took one plug out today and grounded it to see if the spark was blue. On one pull with one plug out the motor started, WOW! I will look for the Champion plugs equivalent to the AC M44C.
Thanks again.

 

[steelespike]

Re: What's wrong?

There is no timing procedure as far as I know. You set the points to .020 at the highest point of the cam.Which I believe is
adjacent to the shaft key.
Then there is the lync and sync where you make sure the carb throttle follower picks up on the stator cam at the correct
mark. There may be a max advance setting for the stator.
There is an inspection window on the flywheel that you can look through to adjust the points and inspect the coils.
Any discoloration or cracks and the coils should be replaced. The impeller should be changed before any extended testing.
also be sure water comes out the relief hole on the leg. Be sure to put it in a barrel with water up to the mount bracket to test run.

 

[Daviet]

Re: What's wrong?

Reset your carb static settings,
High speed - 3/4 turn out from lightly seated.
Low speed - 1 1/4 turn out from lightly seated.
Use the champion plugs.

 

[kfa4303]

Re: What's wrong?

Hi Wayne. Great little motor you got there. I used to have a QD-22. You're correct to run 24:1 mix. You need to run Champion J6C plugs as well. Here are a couple great links that can walk you through an entire tune up for your motor including carb and magneto rebuilds. A couple of them are for slightly different than yours, but the basics are the same. Be sure you only ever run the motor in a test tank with water filled up to about and inch or two below the main exhaust port. These old motors can't be run on muffs. Good luck. Holler if you get stuck.

http://www.sschapterpsa.com/ramblings/johnson_QD.htm

http://www.outboard-boat-motor-repa...on 3 HP 1952-1967 Ignition System Tune-up.htm

http://www.outboard-boat-motor-repa...hnson 5.5 HP 1954-1964 Carburetor Tune-UP.htm

 

[Wayne.McC]

Re: What's wrong?

I want to thank all of you for such useful information, I did a reading of one of my coils and the secondary was 2.3 ohms Higher than the information I'd read. So I will be purchasing new points coils and condensers. I'm getting new plug wires and boots and Champion plugs. As an electrician I can appreciate the timing procedure as described and I know that it works. What i have to do now is relearn how to get a proper compression reading on a 2 cycle engine. I think I need between 60 and 90 pounds and I don't have that with a dry test and the upper and lower are different dry, hoping I did it all wrong because they are both low. If I need a rebuild it's going to take the whole season to get in the water. It's frustrating and I'm missing my golf.