Bigbill
Husqvarna
Pro Class
Ok maybe I have too much time on my hands but I ran the late 70's/'81 250's/390's engines. Then I ran the '83/250, the 83/430, to me the earlier case with the smaller crankcase had more power. I think my 83/250wr was kind of doggish, she ran and pulled but not like the earlier case. Now my 84/250wr is a different bike than my 83/250wr is. It has it all in one package.
Ever compare the two engines. I had a 72/250wr I rebuilt but it sold before I rode it. I never had a chance to compare it. I know the castiron sleeve was different. When the bore cleaned up with my sunnen hone it was tough honing it to the correct size, I was so close to the finish size I couldn't put the coarse stones back in. I'm thinking the early 70's sleeves had more nickel content in them. One a castiron gets that glaze on it, it's tougher than steel wear wise that's why they use castiron on disc brakes, brake drums and flywheels for clutches.
So what do you think about the 70's cases?
Ever compare the two engines. I had a 72/250wr I rebuilt but it sold before I rode it. I never had a chance to compare it. I know the castiron sleeve was different. When the bore cleaned up with my sunnen hone it was tough honing it to the correct size, I was so close to the finish size I couldn't put the coarse stones back in. I'm thinking the early 70's sleeves had more nickel content in them. One a castiron gets that glaze on it, it's tougher than steel wear wise that's why they use castiron on disc brakes, brake drums and flywheels for clutches.
So what do you think about the 70's cases?