There are a few other sources of separate, self-contained motorcycle
transmissions than Harleys. All the '60s and '70s Nortons, Triumphs, and
BSA's had separate 4 speed transmissions. The clutches sat on the
transmission main shaft, and were driven by a 3 row chain off the engine
around the outside of the clutch. They are reasonably small. They might
be getting to be parts for collector's bikes at this point though. Still
might be worth a look at a wrecker or eBay
BMW airheads had separate transmissions into the late '80s at least, and
they are 5 speeds, but they are set up for shaft out, and a spline drive in.
There are a few on eBay right now:
http://cgi.ebay.ca/BMW-motorcycle-5-1969-transmission-complete_W0QQitemZ260058597882QQihZ016QQcategoryZ35603QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/Norton-850-Transmission_W0QQitemZ290057098361QQihZ019QQcategoryZ35623QQrdZ1QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/Norton-750-Transmission_W0QQitemZ290057100803QQihZ019QQcategoryZ35623QQrdZ1QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/BMW-R51-3-Transmission-and-Levers_W0QQitemZ200052209150QQihZ010QQcategoryZ35623QQrdZ1QQcmdZViewItem
http://cgi.ebay.com/ebaymotors/BMW-R100RS-TRANSMISSION-5-SPEED-78_W0QQitemZ140059909344QQihZ004QQcategoryZ35623QQrdZ1QQcmdZViewItem
Or you might find one at:
http://www.ibmwr.org/market/adlist.php?cat=aps
The self-contained ones would be simpler to use. All the Japanese "unit"
bike transmissions are so built-in to the engine, and are usually gear
driven, it would be a bit messy to seal them off to use separately. Not
impossible though. They usually just run with the engine oil, whereas
the separate ones all use 50W - 90 (or something) gear oil which is
quite a bit thicker, especially at cold temps. With your loads, they'd
be fine with 10W - 30 engine oil though.
Kevin Caldwell
Courtenay, BC, Canada
Jeff wrote:
Andrew Wowk wrote on 12/01/06 12:43:
Jeff,
