We are building two Mudflap girl FXRs, but we took a ’96 Dyna and turned it into an FXR with the help of JIMS 6-speed transmission configuration. Since we were using a Rivera-Primo primary drive belt system inside a stock primary, we dug around for primaries and came up with a set from ’89.
The standard late model Evo starter jack-shaft wouldn’t work, so we went on a hunt with the help of Martin Tesh at Compu-Fire and Spyke. We finally dialed in the jack shaft from the starter, and then it didn’t line up with the later model ring gear on the Rivera-Primo clutch. Fortunately Ben Kudon knew the answer. So, here’s the info: Ring gears are made in the following sizes:
66, 84, 102, 106 (106 FOR THE LATE MODEL BIKES WITH THE HD Cruise drive
trans. Must be used with our basket)
66-tooth Fits 1990-93 Big Twin
66-tooth Fits 1994-2006 Big Twin with Rivera- Primo pinion gear
84-tooth Fits 1990-2006 (except 2006 Dyna models) with Rivera Primo
application specific pinion gear
102-tooth Fits 1994-2006 Big Twins
106-tooth Fits 2006 Dyna Models & all 2007 Later Big Twins with 6 Speed Cruise
Drive Trans. (Must be use with Rivera Primo basket, will not fit OE basket)
