63 Evinrude 40 hp, Problem.. Help

[rennen]

Hey there everyone. Haven't spoke with you all since last season, but here it starts. <br /><br />Working on a 63 Evinrude Lark 40 hp Selectricshift.<br /><br />This winter I replaced both coils, points, condensers, new plug wires (which might be the problem), and an impeller (which was easy due to Paul and ct's sticky, thanks)<br /><br />My first run this season went really smoothly. I broke the motor in slowly and tried not to idle much. After about two hours out on the water, anchored and running, the motor started running on one cylinder again. The weird thing was that you could feel the other cylinder trying to fire, sometimes. Just for short bursts of 1-2 seconds.<br /><br />EXACT SEQUENCE OF EVENTS.<br />1) Underway close to WOT<br />2) Slow down for some traffic and decide to switch drivers.<br />3) Shut the motor off, switch drivers.<br />4) Start it up and take off (but only on one cylinder)<br />5) The whole 1/2 mile back to the dock you could feel intermittent bursts off the second cylinder. <br /><br />What the heck should I start with??<br /><br />Thanks Guys,<br />-Sal

 

[rennen]

Re: 63 Evinrude 40 hp, Problem.. Help

I thought of something else. I know, I know.. I let the fuel sit in the carb last winter. Could it have gotten gummed up, and run well for an hour before showing symptoms??

 

[Xcusme]

Re: 63 Evinrude 40 hp, Problem.. Help

Just for grins, I'd pull flywheel and check point gaps,coils on index bosses and plug wire connections at coils. Check coil grounds and condenser wire connections. Check that plug wire ends are fully seated in coils and plug contact spring contacts are terminated properly. You did use stranded solid core wire right?? Post back with your findings.

 

[rennen]

Re: 63 Evinrude 40 hp, Problem.. Help

I will check it all out today and post back, thanks for the lead. The wire was indeed Solid core stranded.

 

[perkdp]

Re: 63 Evinrude 40 hp, Problem.. Help

Did you replace the plugs too ? <br />I ran into a similar situation recently and it was a DOA (dead on arrival) plug. It would fire <br />some as long I held the wire/cap back a bit causing the fire to jump.

 

[perkdp]

Re: 63 Evinrude 40 hp, Problem.. Help

Did you replace the plugs too ? <br />I ran into a similar situation recently and it was a DOA (dead on arrival) plug. It would fire <br />some as long I held the wire/cap back a bit causing the fire to jump.

 

[Chinewalker]

Re: 63 Evinrude 40 hp, Problem.. Help

If you didn't grease or oil the point cam it's possible that the cam rider wore down and closed the gap. The wick oiler that came with the new points should have several drops of light oil on it...<br />- Scott

 

[Xcusme]

Re: 63 Evinrude 40 hp, Problem.. Help

Scott, that's exactly where I was headed....

 

[rennen]

Re: 63 Evinrude 40 hp, Problem.. Help

Well Thanks guys... I Didnt get a chance today to get under the flywheel and look, but I did change the wick (oile side in) and did not change the plugs. I plan to change the plugs, and take it out again, maybe save myself that hectic pull without a puller. <br /><br />If need be later on, I will pull it and reset everything once again (seems like I set these damn points once a week)<br /><br />Thanks Everyone, I will post progress

 

[rennen]

Re: 63 Evinrude 40 hp, Problem.. Help

Guess what happens when you forget to tighten a spark plug and it decides to wiggle itself out of the cylinder at the end of the day?<br /><br />Woops, I am surprised it ran so well with that compromised compression.<br /><br />Thanks for all of your help. Today it will be 90 degrees in Portland, and I plan to take advantage of it.<br /><br />Sal

 

[Xcusme]

Re: 63 Evinrude 40 hp, Problem.. Help

Ha! yup,it sure helps to have the plugs in. Small wonder why one hole went dead. Thanks for reporting back.

 

[perkdp]

Re: 63 Evinrude 40 hp, Problem.. Help

that's a good one.... <br /> you're lucky it didn't ruin the threads .

 

[byacey]

Re: 63 Evinrude 40 hp, Problem.. Help

Originally posted by rennen:<br /> Well Thanks guys... I Didnt get a chance today to get under the flywheel and look, but I did change the wick (oile side in) and did not change the plugs. I plan to change the plugs, and take it out again, maybe save myself that hectic pull without a puller. <br /><br />If need be later on, I will pull it and reset everything once again (seems like I set these damn points once a week)<br /><br />Thanks Everyone, I will post progress

Use a little bit of removable strength loctite on the points machine screws, it'll keep the from loosening up. Does your armature plate have some wobble / play to it? If so,this will make setting the points to any degree of accuracy impossible.<br />There are some previous posts outlining how to cure this common problem on these Big Twins.

 

[68whaler]

Re: 63 Evinrude 40 hp, Problem.. Help

I am in the process of refurbing my "67 40. Loose plug took out the threads and eventually helicoils failed as well. Found a surplus head on Ebay for 35.