CD-22 Issues

[bullie]

I have been tinkering with a CD-22 for a friend’s SIL and have run into something I felt I should ask about before I spend too much time on it. Compression is 97/95. Spark was intermittent so I pulled the flywheel. The nut wasn’t very tight and the flywheel popped with almost no pressure. I figured someone else had been working on it before he brought it to me. I removed the points and polished them shiny and set them with my Tools by Frank then torqued the flywheel to 42 lbs. I also cleaned and installed a kit in the carb. It didn’t idle well and the mag plate slowly moved to the left until the motor stalled if the throttle was released. I rechecked spark and the lower cylinder was back to intermittent at best. So, off with the flywheel a second time and I discovered that it was loose when I removed the nut. I assume someone has over torqued it at some point? What do I need to do about this? New flywheel?

I discovered that the wires were grounding in the clamp/bracket attached to the head so I will replace the wires. It’s possible that the mag plate not staying in position is also related to the wires as they seemed to be "springy" and pulling at the plate possibly due to the old shrink wrap.

[fleetwin]

Well, you could try lapping the flywheel and crankshaft tapers when you remove the mag plate to replace the wires…Are you familiar with this procedure? You just must be very careful not to let lapping compound get into the upper seal area, I am assuming this engine has an upper seal and not the metal slinger. It might be easier just to try another flywheel if you have one handy though, be sure the tapers are clean and dry though, do not lubricate the tapers on either piece.
Are all the tiller friction pieces in place under the tiller grip handle? If not, this may be why the mag plate is drifting back…

[frankr]

IF you are guessing correctly and the flywheel has been severely overtorqued, the taper will be spread and the flywheel most likely is junk. However, possibly it has been run loose, which damages the tapers and keyways on both flywheel and crankshaft. I’ve never seen one loosen up after being properly torqued, as you experienced, so I dunno about that one.

If the coils are dragging on the flywheel magnets, it will rotate the mag plate and turn itself off if you turn loose. As will the other valid suggestions.

[bullie]

quote fleetwin:

Well, you could try lapping the flywheel and crankshaft tapers when you remove the mag plate to replace the wires…Are you familiar with this procedure? You just must be very careful not to let lapping compound get into the upper seal area, I am assuming this engine has an upper seal and not the metal slinger. It might be easier just to try another flywheel if you have one handy though, be sure the tapers are clean and dry though, do not lubricate the tapers on either piece.
Are all the tiller friction pieces in place under the tiller grip handle? If not, this may be why the mag plate is drifting back…

Fleetwin, no. I am not familiar at all with lapping the tapers. I do have another 6 hp I could rob of a flywheel though. I will have to check on the friction pieces in the tiller. But, I did disconnect the armature plate control lever and after flexing the wires a few times it stopped pulling the plate back. I am hoping the new wires will help with that issue.

[bullie]

quote FrankR:

IF you are guessing correctly and the flywheel has been severely overtorqued, the taper will be spread and the flywheel most likely is junk. However, possibly it has been run loose, which damages the tapers and keyways on both flywheel and crankshaft. I’ve never seen one loosen up after being properly torqued, as you experienced, so I dunno about that one.

If the coils are dragging on the flywheel magnets, it will rotate the mag plate and turn itself off if you turn loose. As will the other valid suggestions.

Frank, the only experience I have had with the mag plate moving was from the coils dragging so that was the first thing I checked. It was all good though, no evidence on the flywheel or coils.

I am hoping that the flywheel I have will fit tightly. I did not see any obvious damage to the key or keyway. But, I suppose it wouldn’t take much to be a sloppy fit.

[bullie]

Sometimes its the most simple thing.

Turns out there was a little oil on the tapers. I took a flywheel off of one of my motors and it did the same thing. After torquing it to 42 lbs and backing the nut back off, the flywheel was loose on the shaft. I saw a little streak of grime on the tapers while bug eyed glaring at the thing trying to figure out what was wrong, so I cleaned them up really well with acetone and things stuck together as they should. Running pretty good now. I guess whoever installed the new points and coil put oil on the tapers. Thanks for the help fleetwin and Frank.

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