shorthunter
ArboristSite Guru
After porting my 028 super with the degree wheel mounted to the clutch drum I decided that I needed a better way to mount my degree wheel. A few days later, while putting up tools in the shop I started cleaning off the workbench and throwing old unused items in the scrap bin. As I picked up a broken clutch and a few lug nuts I had an epiphany. What if I could do some minor fab work and have a solid mount which would thread onto the crankshaft in place of the clutch? The next day I started the "fab" work; what I ended up cobbling together actually works pretty good so I thought I would share. Most of the members here probably have all of the items that I used.
To start with you need a clutch assembly that will fit your saw, or in my case a busted clutch assembly. The threads on the Stihl crankshafts and the new Dolmar crankshafts are the same so you can use one mount for several saws. (The old Sachs-Dolmar saws use different threads and I am sure that a few of the other manufacturers use entirely different thread pitch on the clutch side)
I just so happened to have a broken clutch assembly off of an old Stihl and an old Dolmar laying around. I also had a few deep lug nuts sitting in the junk pile. Figuring I could coble the lugnuts to the old busted clutches I started looking for something with the same thread pitch to fit inside the lug nuts. Wouldn't you know, junky old champion spark plugs do the trick.
The clutches(after a little grinding), the junky Champion spark plug, my homemade degree wheel and a lug nut. Ready to be married
The lug nut after removing the cap and squaring the ends
The Sachs-Dolmar unit ready for welding
Side by side prior to welding
Mounted up to my 7900 after welding and painting
With the degree wheel(wire pointer mounts to the bar stud)
To start with you need a clutch assembly that will fit your saw, or in my case a busted clutch assembly. The threads on the Stihl crankshafts and the new Dolmar crankshafts are the same so you can use one mount for several saws. (The old Sachs-Dolmar saws use different threads and I am sure that a few of the other manufacturers use entirely different thread pitch on the clutch side)
I just so happened to have a broken clutch assembly off of an old Stihl and an old Dolmar laying around. I also had a few deep lug nuts sitting in the junk pile. Figuring I could coble the lugnuts to the old busted clutches I started looking for something with the same thread pitch to fit inside the lug nuts. Wouldn't you know, junky old champion spark plugs do the trick.
The clutches(after a little grinding), the junky Champion spark plug, my homemade degree wheel and a lug nut. Ready to be married
The lug nut after removing the cap and squaring the ends
The Sachs-Dolmar unit ready for welding
Side by side prior to welding
Mounted up to my 7900 after welding and painting
With the degree wheel(wire pointer mounts to the bar stud)
