71 Johnson 60hp not running right?

[halmc]

Re: 71 Johnson 60hp not running right?

It seems like the mention of the distributor cap sort of faded away. I know jack about this engine, but I do know that the symptoms your experiencing are precisely what a faulty discributor cap will present in an automobile. Once the cap starts arcing over, it gets easier because it builds a carbon trail.

Assuming that your pretty confident that the engine is cross firing, I'd replace the distributor cap. But let me hasten to add that I've never even seen a two stroke engine with a distributor -- or cap.

 

[jay_merrill]

Re: 71 Johnson 60hp not running right?

While I still feel that I am pretty uniformed in regard to this motor, I think I agree that the problem is probably related to the distributor system. I would perform F_R's test for the amp and coil (see link, above). Since you seem to indicate that both these items were replaced recently, I suspect that you will find that they are both OK. The nature of the problem that you are having also suggests problems in the rotor and/or cap.

 

[jhilton]

Re: 71 Johnson 60hp not running right?

I have a seloc manual. The cdi tests good and coil good. Any reason why it will run the timing at *4 btc for 4-5 secs, and then skip back to the #3 cylnder. The reason i said it was 36 btc is because there are two sets of timing marks on the flywheel. It is actually around *85 btc(the same time #3 fires). If there is a carbon trail can it be cleaned off, there does not seem to be any cracks in the cap.
The coil charge is sent in the middle ring of the cap, then transfers to the rotor then off the point of the rotor to 3 embeded strips on the outside of the cap and on to the plug wires. Ill take a picture when i take it off again. It seems simple when i finally saw all of the brass strips and rings.

When i turn with socket I can hear the points snap every time under the flywheel are they supposed to crack like that? it fires the plugs ,and when it fires they all fire when they are supposed to (when hand cranked). That is why I cant understand why it will run right for a few secs then crossfire somewhere.

 

[jhilton]

Re: 71 Johnson 60hp not running right?

Ok, I thought about it all day and heres what I have come up with. The rotor fires on the #3 cylinder a carbon trail make it fire on #1. Which would make sense on why the #3 runs some of the time, because it cant produce enough voltage to run 2 cylinders. But what I cant understand is why wont it fire on the #1 again right after that. Could the points have a problem too? Dont forget that it will fire correctly for 4-5 seconds afer ran hard and then quit firing on #1. Somebody tell me if that sounds crazy.

Keep posting simple ideas help my brain fizz.

 

[Tim Frank]

Re: 71 Johnson 60hp not running right?

What piece of equipment do you own that is telling you that there is a crossfire between cyl #s 1 & 3?
Is there a chance that the engine is simply misfiring?

 

[jhilton]

Re: 71 Johnson 60hp not running right?

I put the timing light on the the #1 and marked the flywheel were it was firing, and then putt it on #3 it was the same spot.

 

[jhilton]

Re: 71 Johnson 60hp not running right?

What happend to everybody? Can I just clean the carbon off of the distributor cap?
Do you think the coil is drained after the #3 fires since it has two plugs it is trying to supply with current? Like it cant charge fast enough to fire #1 at 4 dbtc.

 

[Tim Frank]

Re: 71 Johnson 60hp not running right?

Your first post also said that you have "a new CDI ignition". My understanding is that the motor has a CDI ignition system (I think it stands for "capacitor discharge ignition") so did you change every component or just one or two? And if so, which ones?

Also, one other key place to check is the large connector in your electrical harness, just inside the motor. There are 10 or more pins and this is a frequent source of poor connections. Check the wiring insulation around that plug and other interior witring for deterioration or even complete failure.

jhilton,
Any response to this?
did you check this link?
http://forums.iboats.com/showthread....&highlight=BHP

There is enough witchcraft and cross-your-fingers in those early CDI systems that if the 12V side had any quirks, you could get any number of bizarre symptoms in the secondary side.

 

[jhilton]

Re: 71 Johnson 60hp not running right?

Ill check the connector, but I dont see how it could cause a cross fire. Everything I have changed is in the first post, exept for the plugwires.

 

[jhilton]

Re: 71 Johnson 60hp not running right?

Can you tell me what the initial timing and total is suppose to be. The boat is runing well now on plane. The fuel pump was only putting out 1 psi. So i put a electric fuel pump on it. It is going about 20mph faster now. I am wondering if the initial timing is set to low causing the problem. The book said that these motors are prone to fouling plugs I wonder if that is some of the idle problem. Thank you for all of the help so far.