I don't know if any of you will believe this or not, back in the mid 1970s, I bought a 1971 XS1B 650 Yam off of the original owner. It was made in November of 1971, it had the drum front brake with the black rubber plugs, no electric start and the rear shock covers were painted to match the tank and side covers. The tank and side covers were factory painted 1972 Brilliant Red instead of the 1971 Candy Orange color. The original owner and the Yamaha shop swear it came out of the crate that way. If I had a scanner, I could post some photos taken in 1974. Have any of you heard of Yamaha doing this at year end production ?