You caught my eye and should reply. In the 80's I bought my first of 4 new stihl 056 MAGNUM II saws It was a lower ser # saw .We had 2 brothers that loved working on Stihl and I had a Kill switch not working. When all was said and done They commented that my saw had 8 teeth on the rim and if I recollect It was an upgrade . Question I never found an answer to "upgrade from what?" I believe the Magnum was originally a 7 tooth rim and the "BHP" was hindered by speed as the powerhead had power in reserve. I wonder at times if this is the explanation for the 85 vs. 84 DL issue. Your comment on Husky infers that Husky designed their saw around the bar and Stihl kinda Miscalculated and You get the Idea. Thank you for the comment it helps Anyone else with Input -yer welcome too.84DL on a 24" Husky bar is fine with an 8 pin.