Hello steamwally , I have reversed the rotation of a Berling four cylinder mag with this help . First rotated the cam ring almost 90 degrees and it changed from clock to anti clock which is what I require but that meant the cam ring arm was pointing down . so had the choice of removing the arm and brazing ? etc on at the correct position but what I did in the end was to turn the points plate about the same degree and leave the cam ring in correct position . I had to file the keyway off the male taper to allow this and just hope it doesn't slip in usage !! It works well 'on the bench' by power drill in all degrees of advance and retard . Thanks , Ken
i fitted a stihl points type ignition plate in an old echo saw... got NO SPARK until turning in wrong direction and then big blue spark.....checked position of strongest magnet and cut a keyway to get magnet leaving 2nd armature end as points open.... now sparks but weaker. strange as the stihl was anticlockwise rotation and echo is anticlockwise rotation....
Hi Kev, you'l need to pull the cam from the rotor shaft. It's a while since I've had one of those in bits but the cam will be keyed in some way and being hardened, they are easily damaged during removal. You will need to remove the key/ locating peg in order to move the cam. Turn the magneto in the desired rotation until you feel the pull of the magnets. The basic (very!) principle is that the spark occurs as the magnetic field is collapsing so with that in mind, set the cam to open the contact breaker at the point you just turned the magneto rotor to- that will get you in the right area, then fine tune as required . To be perfectly honest, there are so many Lucas RS1's still about that if it was me, I would just find one of the rotation required. There is a little more to reversing mags than this video - many have handed contact breaker sets so that the heel of the moving contact bears on the correct side of the cam relative to rotation, so you need to consider the suitability of the particular magneto if you intend to reverse it.
That was one of the best easy to follow videos that i've seen in quite a while . well done .
thanks a lot ,man. followed your directions,it worked like a champ. saved me trying to find a new magneto and lots of money.very grateful.
Brilliant video easy to understand instructions.
Thanks, I'm definitely going to have to do this- relocating the mag on an old gravely tractor
thanks for sharing this been looking for more information on this.
Thanks for sharing that , great tip!
Thanks tor the tip so simple thinking about it.
No problem, saves looking for another magneto!
Quite interesting, and spark was easily seen.
Thanks, not always easy to see a spark on camera but this one seems to pick it up ok.
Cheers
Hello steamwally , I have reversed the rotation of a Berling four cylinder mag with this help . First rotated the cam ring almost 90 degrees and it changed from clock to anti clock which is what I require but that meant the cam ring arm was pointing down . so had the choice of removing the arm and brazing ? etc on at the correct position but what I did in the end was to turn the points plate about the same degree and leave the cam ring in correct position . I had to file the keyway off the male taper to allow this and just hope it doesn't slip in usage !! It works well 'on the bench' by power drill in all degrees of advance and retard . Thanks , Ken
i fitted a stihl points type ignition plate in an old echo saw... got NO SPARK until turning in wrong direction and then big blue spark.....checked position of strongest magnet and cut a keyway to get magnet leaving 2nd armature end as points open.... now sparks but weaker. strange as the stihl was anticlockwise rotation and echo is anticlockwise rotation....
I see there is a choice of 3 notch's in cam, can you use one of the other 2 to change rotation to save cuting new notch?
Now the points adjustment on an ML trip mag please??
From where do we get these megnato?? Plzz suggest.
hello steamwally (Philip)ive got an ML LISTER MK1-3 That needs reversing any chance you could take it on for me, Regards,Brian
Hi I’ve got a Lucas Rs1 which I want turn into an anti clock for my anti clock lister d any ideas how I do it cheers kev
Hi Kev, you'l need to pull the cam from the rotor shaft. It's a while since I've had one of those in bits but the cam will be keyed in some way and being hardened, they are easily damaged during removal. You will need to remove the key/ locating peg in order to move the cam. Turn the magneto in the desired rotation until you feel the pull of the magnets. The basic (very!) principle is that the spark occurs as the magnetic field is collapsing so with that in mind, set the cam to open the contact breaker at the point you just turned the magneto rotor to- that will get you in the right area, then fine tune as required . To be perfectly honest, there are so many Lucas RS1's still about that if it was me, I would just find one of the rotation required. There is a little more to reversing mags than this video - many have handed contact breaker sets so that the heel of the moving contact bears on the correct side of the cam relative to rotation, so you need to consider the suitability of the particular magneto if you intend to reverse it.