KXT-A1 --- Front Drum Brake, Rear Disc
KXT-A2 --- Front Disc Brake, Rear Disc
B-Series was the 1986 model total redesign.
There's some minor rear suspension differences between the A1 & A2. Swingarm and linkage were painted gold on the A1 and silver on the A2. The motors have a few internal differences and A2 has a bigger carb. I'm pretty sure the kill & headlight switches were different. I'd have to check my manuals.
1986 Tecate
1984 Tecate
1985 Tri-Z
1986 ATC350X
1985 ATC250R (2)
1985 ATC125M (2)
1982 ATC70 - Original Owner
175 TriMoto Frame with Pro-Tec Rear Suspension
3-Wheelin' since '82