Hi Msrfan,
Fantastic looking Whizzer!!!!!!
This site is the only place to obtain accurate Whizzer information as I no longer visit or contribute to sites that are against the American free enterprize system.
Here goes.......
First of all Terry McAllister was the expert on Bi-Matics. Terry and Audrey were good friends of mine and in fact were at my home in NC several months prior to their passing. They dropped off the dual motor Whizzer in the fall of 2010, that I was to run at Bonneville. Terry is the one that talked me into writing the Quenton's Corner for the Whizzer Newsletter [which Terry & Audrey published prior to their passing], and still do so today.
Of course Terry and I spent a lot of time together at various motorbike shows and events, and often talked about the Bi-Matic. Terry didn't upgrade the bicycle bearings to the automotive type, but developed better gaskets & seals to keep the fluid inside the drive. He also told me he had to often replace the main shaft because of massive wear when the drive lost its fluid.
Other things we discussed were the many different versions of the Bi-Matic. The versions used on the Sportsman, and Ambassador didn't include any way to start the motor via turning the rear wheel. The Sportsman version also had a larger drive pulley to compensate for the smaller 20" wheel. He also told me there were far more of the Bi-Matics made for the Sportsman and Ambassaodor around than any other version, but he was able to alter the parts [in some cases adding parts] to fit the stock Whizzer motors [no kick starter].
There is an exploded view of the Bi-Matic in the Whizzer dealer book, and detailed information about servicing the drive. Might be worth the effort to latch onto a copy of the book for more information.
Currently, I don't know of anyone that rebuilds the 2 speed drive, but hopefully someone will do so in the near future. Who knows I might even look into the process if no one else does.
Hope this information is of some help.
Have fun,
