BIGDAVE, Grand Rapids, MN. I have been asked to help a friend on a nice '48 B12 with a few problems, rusty gas tank, blinky lights, honky horn, whine in diff? Never touched one B4 but saw some on Lake O the Woods. Owner says check out this forum for all I need to know. I am retired from paper mill and have several vintage snowmobiles and help others with their projects. Antique Snowmobile Club member and have experience with the International Snowmobile Hall of Fame. I have mostly Arctic Cat and OMC '67-'76. Nothing nice (except my wife, who wholly suports my absence). 1948 is just barely older than I am!!!! I have several Wankel stuff and have ridden the (not mine) 606 twin! BIGDAVE Johnson