3r5 is a yz465 1980 4v4 is a yz465 1981 engine and frame numbers will start with these prefixs
18 ft. lb. - That is directly out of a 1981 YZ 465 H owners manual.
18 ft. lb. From owners manual of 1981 YZ 465 H.
The OEM carb on a YZ465 is a 38MM Mikuni VM roundslide.
the first yz 85 was built in 1977
yz 80 B
2001-2012
2001
1982 yz 125K
2004
2008
1993
what year models can i use parts from to fix my 1992 YZ250