It's really hot here in Italy so the best thing is...to sweat in the attempt to determine the exact names and the engine capacity of the racing machines that obtained the TT course outright lap record during the years.
I need for now an help about the followings machines (info to confirm/add/change):

1975 - Mick Grant (109.82 mph) - Classic TT.
- racing machine: KAWASAKI KR 750 ?
KAWASAKI KR 750 H2 ?
KAWASAKI KR 750 H2R ?
- engine capacity: 748cc.

1976 - John Williams (112.27 mph) - Senior TT.
- racing machine: SUZUKI RG 500
- engine capacity: 498cc.? 499cc.?

1980 - Joey Dunlop (115.22 mph) - Classic TT
- racing machine: YAMAHA TZ 750
- engine capacity: 747cc.

1981 - Joey Dunlop (115.40 mph) - Classic TT
- racing machine: HONDA RSC 1000 ?
HONDA BRSC 1000 ?
- engine capacity: 1062cc. (for the RSC)? 996cc.(for the BRSC)?

1984 - Joey Dunlop (118.47 mph) - Senior TT
- racing machine: HONDA RS 500
- engine capacity: 498cc.

1989 and 1990 - Steve Hislop (121.34 mph; 122.63 mph) - F1 TT
- racing machine: HONDA VFR750R RC30
- engine capacity: 748cc.

1991 - Steve Hislop (123.48 mph) - F1 TT
- racing machine: HONDA RVF750
- engine capacity: 748cc.?

Thanks in advance.