Originally Posted by Airhead Wrangler
From '85 on, I believe it's just combustion chamber diameter. Depth is the same, I think. Valve sizes are the same………
So, castings the same, just machined differently. Yes? Valve seats in the same position?
Current - '74 TR5T : '93 R100R : '99 Gran Canyon : '06 ST3s
Past - Variety of British, French, Italian, Czechoslovakian, and German bikes from the '70s, '80s and '90s