Aaargh!!! Flywheel/Stator Woes.

[Fyrman]

Ok all you great gurus out there, this is where I stand today. I have engine parts spread from one end of my shop to the other yet I seem to be missing one.

I recently picked up a bottom end (Serial# Z50AE-402452) from a guy that said it was fine, (I'm doubtful at this point, but we'll see...). I bolted up a cylinder, piston and top end without any problem and then went on to fasten up the stator and flywheel. Much to my dismay, the flywheel bottoms out on the stator baseplate before coming up tight on the crankshaft. I thought I must be going a little mental since of all the other pieces and parts I had lying around, regardless of the combination I tried putting together, were doing the same thing. It wasn't until I fished an old seized crank out of my garbage can and compared it to another one one on my workbench that I realized that there were two different length cranks. Apparently I have a short one in the motor I'm trying to put together but have the flywheels from a long shaft version.

Can anyone give me some insight/part numbers to what combination of flywheel and stator I need to put this back together? Is the stator I have fine? I'm assuming I just need a narrower flywheel but I really don't know.

Thanx!

[steampick]

I notice in one picture you don't have the woodruff key on your crankshaft end. Did you just remove it for the picture?

[redrider37]

That kind of looks like a ct70h flywheel. Does it have the mechanical advance inside? The h's have longer cranks, hence why your flywheel is hitting the stator plate.

[Fyrman]

Steampick, Yeah, it's there. I had to shake the hell out of the motor to get it back out after it fell into the little hole below the timing chain, but it's there... *fumes*

redrider, there's no mechanical advance, just a an empty drum... like an automotive brake drum. It came out of a 1980 Z50 motor as far as I know. Comparing the shaft of the crank with one that I know came out of a 50, it appears to be about 1/2" shorter. Could this be a CT70 bottom end?

[steampick]

I could be wrong, but I thought the Z50 and CT70 bottom ends were the same, at least up until a certain year. Perhaps the 1980 Z50 bottom changed some from previous ones. I know the 1980 and later CTs had differences there, mostly the length of the connecting rod, but possible the length of the crank too.

[Fyrman]

Do you know, is the depth of the flywheel on the 70 shallower than than on the 50 or is it just the taper on the inside that's smaller?

Anyone?

[redrider37]

The 70's and 50's are pretty much the same. The 70's changed in 82, not sure about the 50's....Your flywheel doesn't look like a older style. the newer style flywheel wouldn't work on your motor. The newer cranks 82' and up are the same length as the h cranks. 82 still had points also. Not sure when the 50's switched from points.

[Bugandi]

That doesn't look like the proper flywheel, or should I say, it doesn't look like the flywheel on any of my 4 z50's. That looks like a flywheel off of a newer motor. i am working a lot over the next couple of days, but will try to get picture and or part number of what mine are, hopefully that will help.

[Fyrman]

That'd be great, thanx!

It's just so bloody frustrating having this sitting here like this, so close to being done. I have a full rolling Z50 chassis just sceaming for a motor so I'd love to get this together. I had the exhaust welded up on our CT70 yesterday and got to watch my little guy run around on that all afternoon. Geez they sound great when they're running good and with a nice tight exhaust. He's having a blast on it and I use it for running around the neighborhood. It's going to be our next resto project over the winter... it runs perfect, now to make it pretty!

[Bugandi]

Sorry for the delay Fyrman. I haven't had a chance to take the picture yet, b ut the link I have attached is a picture of all the flywheels for my z50's. Hope this helps.
B

eBay Motors: 1967-83 HONDA Z50 Z 50 70 CT SL XL FLYWHEEL FLY WHEEL (item 280255766180 end time Aug-19-08 1102 PDT)