I've just come up with an idea that will work for you. (1) Cut
a 12 inch diameter disk out of cardboard.(2) Cut a standard
bicycle chain to fit exactly or just slightly loose, if it is
loose, cut another disk slightly larger until you have one that
will fit inside the chainly snugly, now you have a template
that you can use to....(3) Cut a 1/4 inch plywood disk and (4)Fit
the chain around the disk, preferrably it shouldn't quite fit
take a hard rubber mallet and tap the edge of the chain into
the edge of the disk all the way around until you can connect
the chain link, you now have the middle section of your secondary
flywheel ....A Chain Gear (The small chain sprocket (
Briggs & Stratton that has chain drive for a self-propelled
mower will mesh quite nicely into the Chain Gear.(you can then use a regular Briggs & Stratton starter from an 8-12 hp. Briggs after you replace the starter gear with the small chain sproket)(4)Now cut
two more plywood disks 1/2 inch larger diameter than your first
plywood disk, these will be the top and bottom plates of your
secondary flywheel ...with the Chain Gear sandwiched in between
them (like an Oreo cookie). (5) Remove the blade and blade
clutch(the hub that the mower blade bolt onto) take the blade
hub centering it over the plywood disks marking the bolt holes
and drilling holes in the disks so this flywheel is bolted on
in place of the blade. I will be making this also so I'll have
pictures in a couple of days to show exactly how to do this
any questions just E-Mail me (peppysue@suite224.net) Norm.