041 Super Flywheel Problem

[Bob95065]

I have a Stihl 041 that I picked up years ago. It was completely torn apart in a box. I think there was a 041 in there too but I don't remember. I tried to give it away on the Christmas thread unsuccessfuly for years so now I'm putting it together. I think I may have given some stuff away because I still have a 041 cylinder but I don't remember.

I was able to clean up the cylinder and got a new Cross piston on eBay. The Cross piston was NOS and appears to be of good quality.

I set the points and put the flywheel on it and set the timing using the mark. I torqued the flywheel and the crankshaft was very difficult to impossible to turn. I removed the flywheel and saw that it was interfering with a raised ridge on the case half. Pictures below:

Ridge interference is at shiny ring:



Different view of ridge:



Close up of flywheel. Bosch part number 0204003033



So does anyone know if the flywheels were different between the points 041 and Super? Am I doing something wrong? Why is there contact between the flywheel and case? Any help appreciated.

Thanks,

Bob

 

[Bob_w]

Bent crankshaft, Bad bearing, washer missing, key not seated, excessive play in bearing? Cracked off piece of metal in the gap? The casting looks shaved, chipped in the second picture.

 

[stihltech]

I believe the flywheel sits to the inside of the ring. Is it hitting on the inside or top? I have also had to hold the coil inward when tightening. Are the magnets all tight inside the flywheel? I take it this happens before the fanwheel is installed.

 

[Bob_w]

You don't need to hold the coil. space it out.

Usually the coil is spaced out the magnet .012 or so by a spacer and then tightened. I used a .013 business card on the MS391, worked fine. Watch out that the magnet does not pick up a washer! The 391 used 2 washers for the ground screw...at first, I had one stuck to the magnet, then I saw it as I spun it by hand.