Grand Prix 500
Main Motorcycle: 71 Triumph T120RV Bonnie
Join Date: Nov 2007
Location: Central Texas
Other Motorcycle: 72 BSA A65L Racer
Extra Motorcycle: 71 BSA A65 T-Bolt Bobber
My Thoughts (I have an M.A.P. big bore kit on a 71 T120RV)
I used an earlier/lighter flywheel crank and had the rotating assembly dynamically balanced.
at idle on the race stand the bike does not creep. the vibrations are signifiganty reduced. also, ran it during the initial run in without the head steady (per the M.A.P. directions).
Performance is snappier, more initial torque and spins up to RPM quicker and with more punch. it pulls the front end loose through fourth gear.
my A65 BSA's will eventually get the same Dynamic Balance treatment.
Needless to say, I am impressed.