I should know this but need help
Looking at the picture what is the ration of the mag
Rotation. can't spell sorry
Hi Mike- pretty sure that's a CW rotation (looking at the input shaft end of the mag). Easy enough to confirm- take that little center screw out and the entire point plate will come off the end of the armature. There will be either cw or ccw stamped on the back side of the point assembly. I'm also pretty sure the 3 gear Bosch drive brackets require a CCW rotation mag.
I'll check at the shop and report back if no one lese chimes in here. Dan
Didn't know where to look but I thought it was set up wrong for the Bosch front plate. I will look and see if I can find the marks stamping
Come to think a lot of years ago I was going to build a reverse rotation engine for a flat head hill climber. I think I have CRS
There should be an arrow stamped on the oiler on top also.
No oiler on an AT4 that would have been to easy. LOL
I didn't read all thru above post but maybe there is something in the instruction manual that might help.
As I understand it, the arrow on the oiler doesn't mean much because you can reverse rotation on a Bosch if you change the point set.
Mike ; When you look from this side , it is CCW .
As by tractors and stationaire engines.
Hope this helps
From Bosch manual, for those who are unfamiliar with the standard convention of magneto rotation.
Thanks to all that posted.
Mark your links really helped.
Peter your drawing took this from clear as mud to clear.
Saved both for reference.
Looks like I need to find parts or another mag.
I just added this to my saved list also.
Here's a bit about reversing rotation as you can't use the timing marks "as stamped" if I remember correctly:
https://books.google.com/books?id=8lkfAQAAMAAJ&pg=RA20-PA39&lpg=RA20-PA39&dq=rev ersing+bosch+magneto+rotation&source=bl&ots=g40SOOPyG7&sig=masmF2cWnWBXhEIY7rXdR hdcCn4&hl=en&sa=X&ved=0ahUKEwir2Iqg26HYAhXimeAKHZjaAC4Q6AEIYTAN#v=onepage&q=reve rsing%20bosch%20magneto%20rotation&f=false
Every Bosch mag I have ever worked on has timing marks for both cw and CCW rotation pre stamped on the large brass gear that the rotor rotates on. there may be some that don't, but that's not been my experience.