In June 1967 it took 4886 frames to build 1083 bikes on the 175 if the numbers are right in Post on frame#s. Parts guide also designates before and after 16R What happened in June 1967? I also noticed the serial# 16R32349 used Frame #TA1-30524. Oldsbsguys bike 23L00733 used Frame# TA1-31558 which is early 200build Sept 1968. The frame posted TA1-25615 had a ser# 16R31243 Why more bikes than frames? Could all 200 owners check the engine#s and see when they changed from TA1 to TA2?