Motor Still Won't Fire After New Ignition Components and Carb Rebuild

[bwkre]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

The mount is not worn down, I just put a 61 18hp together and it looks identical. You want to line up the coil face with the upper edge, the one where the screw is. It must be right on or the coil face will get hit by the flywheel magnets. I put an arrow and an attempted drawing on your picture. I hope you can see from this where it has to go.

 

[adt2]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

Okay, thanks. I'm pretty sure that's what mine looks like, but I'll inspect it closer when I get home. I'll also post some close-up photos so y'all can check my work.

 

[nwcove]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

i do see that the spark seems to come and go. hard to tell from the vids, but are you grounding the tester to a painted surface? also, as mentioned above, did you change the plug wires, cut a bit off the coil ends? screw them into the new coils as opposed to pushing them in?

 

[adt2]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

Yes...every single surface on this thing is painted in that awful purple color. Having a hard time finding a piece of bare metal to clip to. Plug wires are brand new copper-coil plugs, and I twisted them onto the coils prior to installing the coils on the armature plate. I did have to cut both wires to length first.

 

[nwcove]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

id sand some of that purple paint off on the grounding location for the spark tester and see if the spark stays more consistant. still odd that the motor wont sputter, backfire or give you at least a puff of smoke as the spark does look strong.

 

[bwkre]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

I not sure it is possible to get a spark with the coils wired to the wrong points, but are you sure that they are connected to the correct set of points. The green wire is long enough to go to either one. It should be as shown below. The green wire should go to the points that are ccw from the coil looking down.



The image is from the following article. Something worth reviewing although it is not the same motor the principle is the same.

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

 

[AlTn]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

wires reversed affecting spark?...no....towards the end of the #2 cyl vid..it does appear to skip slightly once...otherwise, to me, it looks like a healthy spark...was the underside of the armature plate oily?...have you examined the grounding wires that go to the points for any abraiding or holes?..the groundwires need to run in that dipped area, closest to the crank, in the well the coils fit into. You may need to trim back or slide back some of the casing that the ground wires run through in order for the coils to fit well.

Great job on the vid...if you'd post one of the armature plate top,bottom, and sides it might be of benefit. Or..a few seconds at each stage of reassembly.

 

[nwcove]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

looked like it was dropping spark on both cyls to me, maybe close up the gap slightly on the tester to see if changes?

...and just curious, but wont that spark tester plug directly into the sparkplug boot on the end where you have the small alligator clip attached?

 

[adt2]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

Yeah, it'll plug in there, but it's a loose fit and tends to fall off. That's why I pulled the boot and squeezed the connector shut a bit.

I just pulled the flywheel again, and everything seems good. The coils are lined up with the mounting bosses, the wires are all in good shape, and the gaps on the points are correct. I cleaned the points a bit with a thin file dipped in acetone but haven't put the flywheel back on yet. Also moved my ground clip to bare metal on one of the bracket assemblies; no change in the spark patterns.

Any more suggestions before I start reinstalling stuff?

 

[adt2]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

Here's a few photos...maybe somebody will notice something I missed.

 

[bwkre]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

Get your camera and show us a picture with everything installed while the flywheel is off. Maybe someone will spot something!

 

[nwcove]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

just for reference sake, check the strength of the flywheel magnets, not sure if my method is right, but with the flywheel upside down, i lightly dangle a screwdriver about 3/4" away, if the mags are good and strong, it should pull the screwdriver in. (1/2" could be more reasonable) it also looks like ( in pic 3) that the coil (s) are back a bit from the bosses, maybe just the angle of the pic tho.

 

[adt2]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

And a few more...

 

[adt2]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

just for reference sake, check the strength of the flywheel magnets, not sure if my method is right, but with the flywheel upside down, i lightly dangle a screwdriver about 3/4" away, if the mags are good and strong, it should pull the screwdriver in. (1/2" could be more reasonable)

Interesting...on one side, the magnet pulls a screwdriver in almost all the way from the central hub. It's a good, strong connection. On the other side, the magnet is weaker, but it does pull. Some. Not a lot.

 

[Daviet]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

Couple of thoughts, post #70 picture #3, it doesn't look like the coil is even with the mounting boss, could be camera angle.
Post #73, second picture, is the short screw that holds the mag plate tight, it looks like the head of the screw is sticking up kind of tall, again it might be the camera angle.
Did you ever check the spark on your lawnmower to see how it pulses?

 

[adt2]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

#70, picture 3, you're right - the coil is a hair inboard of the mounting boss. Is that the same problem as being a hair outboard?

#73, picture 2, that's an optical delusion. There's a washer under that screw.

Have not checked the lawnmower yet.

 

[Daviet]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

Being a hair inboard increases the air gap between the coil and magnets in the flywheel.
Being a hair outboard will usually cause the flywheel to rub on the coil.
The coil laminations should be even with the boss on the magplate to get the proper air gap betwee the coils and the magnets in the flywheel.

 

[adt2]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

Okay, that's an optical delusion. I just went out there and double-checked, and the coils are pretty much flush with the mounting bosses at all four contact points.

 

[milliesdad]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

NOT PRETTY MUCH FLUSH. they MUST be flush.

Fix that first,

 

[adt2]

Re: Motor Still Won't Fire After New Ignition Components and Carb Rebuild

Okay, well, that's going to have to wait until the next time I'm out there. They're as flush as they're going to get without me putting a straightedge on them.