Took it to bits

[ianc]

Hiya,
The bearings should be standard "popular metric".
You need C3 which is measure of internal clearance.
You should be able to see a four figure number eg 6204. Or 6303 etc.
This number tells you it is pop met, heavy, medium or light duty and finally the bore size.
If you can't see the numbers post the dimensions and I'll let you know the correct ref.
Only buy good quality, even the best are cheap enough.

Regards
Ian

[MichaelTorre]

I don't know what my. *former* supplier gave me.....



M

[MichaelTorre]

well after a couple of hundred miles after the resurrection or restoration,
I have this report .............I know why you guys like these bikes so much.

Wow.
It is an understated elegance , very smooth very nice drive.

My mirrors are so still I can see what's behind me that is incredible.
Not one of my Jap bikes are like that.
The clutch is easy and it is very tractable and pleasant.

I must admit the four speed gearbox with its noise like the crunching is
taking a very long time for me to get used to but I'll give it time.

I am currently gathering parts for a complete rebuild, renewing the cylinder
and the crankcase to factory specs blueprint so that I have trouble free operation into my old age.

This is no dust collector.

I plan on riding till I can't walk.
M-

[DAVID THOMPSON]

till I can't walk.

is followed by a collection of sidecars to haul your electric scooter
an MZ Charly electric scooter

dave

[MichaelTorre]

LoL !
man, I thought i was stubborn, you take the cake.

M

[DAVID THOMPSON]

when i was about 5 my dads 1941 Packard car blew up..

from age 5 to about 9 we walked every where then i started riding again
bicycles with a maytag engine

dave

[brennain1]

Would someone mind explaining the process and the reasons for glaze busting. I've got a rough idea what this is but I'm no expert and wouldn't mind one of you chaps who knows better walking me through the process.

[MichaelTorre]

Glaze busting is used to break up the Polish of a used to Cylinder.

Most used cylinders are not concentric or cylindrical anymore .
you have to measure and see that you have no taper and you have
round hole........a good rule of thumb is a half of thousands or. 0005.
for the limit of your deviations.

ie)The length of the hole and around the
hole like a clock at intervals the length of the hole.

Perfect cylinder equals NO taper, and perfectly ROUND.
(perfect doesn't exist)

That may seem a little close but if you have a sloppy cylinder you're wasting
your time putting rings in.
The rings will flutter and float.
Giving you blow by.
Overheating you engine.
Consuming oil.
Destroying your work.
Vexing your soul and tempting you to all sorts of venial sin.

Anyway you get a hone that has 3 shoes on it and it
is spring tension to push shoes out against the cylinder.......you use oil to lube
generously and you start the drill attatched to the hone about 200-300 rpm
and thrusting in and out of cyl. About 3 to 4 thrusts per second so you get a nice,
45 degree crosshatch.
Don't use the dingleberry home with a lot of small balls because the little small balls
will get caught in the ports and wreak havoc.
It only takes about 10 to 12 seconds to freshen it. You don't want to resize it.
Wash with hot soapy water, dish detergent and hot rinse.
Oil to preserve.
Never use solvent to clean..... it goes into the pores carrying the grit with it.

If its lopsided from the forces of combustion, spend $50 to have it bored, to
The next size piston ,and rings the results is worth it.

And break it in properly, not like a barbarian.
The piston has to be formed to the hole as well as the rings.
Heat and pressure has to be given a little time to do that.
M-

[MichaelTorre]

Well after a cautious 600 miles the Little MZ is break in . It will get to 60-65 mph with
out a lot of drama and hold 60 in a mild head wind or mild grade.
When a cold front goes thru and we have a 30 mph wind, forgetaboutit.

Milage has gone up too,... with 51 mpg netted for city driving and a trip in the country
side.

I started putting high test gas in it for no good reason.
Also,
I have been to much of a coward to drop the oil ratio
below 40/1.

The mild manners and easy handling is making this a favorite.
It is so small and light turning is accomplished with no drama. Is it actually
possible to drag the foot pegs ? I haven't found yet a turn that's right enough.

This little hamster will be in our family a long time.
Wish I could post pictures.

Regards
M