70 hp Evinrude. Won’t start

[Kevinthomsoncfc1]

Hey I have a 1984 70 hp Evinrude , cim
just rebuilt it over the winter, the engine won’t start . Started briefly . Almost wants to go then I end up flooding it . I feel like it could be a timing issue . Not 100% sure how to Verify it . With the lever up in start position the mark labeled start on the cam is not inline with the follower and spark advance is at max . 130 psi compression on all cylinders . I have spark and fuel going to all carbs . Any ideas would be great .

 

[F_R]

Hey I have a 1984 70 hp Evinrude , cim
just rebuilt it over the winter, the engine won’t start . Started briefly . Almost wants to go then I end up flooding it . I feel like it could be a timing issue . Not 100% sure how to Verify it . With the lever up in start position the mark labeled start on the cam is not inline with the follower and spark advance is at max . 130 psi compression on all cylinders . I have spark and fuel going to all carbs . Any ideas would be great .

One mistake I see here is you are trying to set it up with the control cable attached. The link and sync and idle speed should all be established on the motor first. Then attach the throttle cable and adjust it to fit the motor. Always adjust the control to fit the motor, never adjust the motor to fit the control.

I hate to say it, but you need to do the link and sync and timing according to the book. That means you need the book. Or a darn good mentor.

 

[Kevinthomsoncfc1]

Thank you for the reply . That’s good to know. I only had the linkage off cam . I have a Manuel just doesn’t seem to cover link and sync . I’ll remove the throttle cables tonight and try again .
Throttle butterfly’s should be fully closed on start up. Should I have any timing advance ?

 

[racerone]

Clearly you need to do some reading on outboard adjustments and the starting of an outboard.----Sorry.----And are you sure it is an 84 model ?

 

[Kevinthomsoncfc1]

Sorry it’s a 1981 . I’ve read through the Evinrude manual. It’s not clear on start positions . I was just curious if with the cables off should I have the timing fully advanced when I have the throttle cables off .as when I start the boat it usually starts on high revs with the lever in the start position then I bring it down to idle with the lever

 

[Klink]

The Evinrude manuals always have the Synch and Link instructions in the first chapter with plenty of pictures and details. I have a 1980 manual for the 50/55/60 and it is in section 2-15. Are you using an Evinrude (OMC) manual?

 

[Klink]

By the way, I worked on a friend's 1990 Evinrude 3 cyl. 70hp, and it gave me fits with no spark, till I learned that it needs to crank at full battery rpms or it will not generate spark. I had to get a new starter (it did need it) and use dual batteries to get it to spark and run properly (till I eventually bought a new battery). If it does not spark, jump the battery till you see appreciable increase in rpms when cranking it.

 

[Kevinthomsoncfc1]

Thanks for the reply . I do have good spark . Just thinking it might not be sparking at the right time .thinking it’s a timing issue .

 

[Klink]

Are you using an Evinrude (OMC) manual? ​

 

[Kevinthomsoncfc1]

I have the seloc Evinrude manual. Had good info in it but I feel it’s missing some content .do you know if my power pack could give me spark at the plugs but still cause a no start ? Not sure how to test it

 

[Klink]

I'm no expert, I only know my engines. How do you know that you have spark at the plugs? I can only know if I have spark at the end of the spark plug wire boot, but if the plugs are bad, when I connect to the plugs they are not going to spark. I'd change plugs in that case to see if that's the problem, but you are talking about three cylinders, no way you have three bad plugs. If you have spark and fuel it is going to fire. I'd spray Starting fluid in the carb and see what happens.

 

[Kevinthomsoncfc1]

All 3 plugs fire when in the end of the plug lead .carbs are fuelling. 130 psi of compression. Coils all show the the correct resistance. Starting to suspect the power pack . I can get it to run on key crank some times then let the key go she’s done . Pops and back fires . Joys of boating I guess

 

[Klink]

All 3 plugs fire when in the end of the plug lead .carbs are fuelling. 130 psi of compression. Coils all show the the correct resistance.

Did you test the spark strength? My 70hp has to jump 1/2" according to the manual, the people here say 7/16".

 

[racerone]

Check the flywheel key !!!----People say to test for a spark intensity of 7/16" to try and teach folks that laying the plug on the block is not a good test !!

 

[Klink]

I made a spark tester from a junk 8 cylinder distributor cap. The center contact in the cap was drilled out and removed. Then a metal disk was fashioned and bolted in where the center contact used to be, with a ground lead coming out the post on the other side of the cap.​

The metal disk was made with the diameter being such that the gap between the disk and each individual plug lead contact was 7/16"​

Attach ground wire, attach spark plug wires to the dist cap posts, crank starter, and watch the sparks jump from each cylinder post to the center disk.​

On the 70hp, the beauty of it is that I can test all three cylinders at once. I can test up to 8c ylinders at once.
​

 

[boobie]

As said above, Check your flywheel key !!!!!