Matatac
XS650 New Member
Ladies and Gents,
Since I live in Vietnam and there is no local dealer to take my XS bobber to for constant repairs (and motorcycle boots are not made for walking long distances in), I decided to go for the magneto setup.
Got the Morris Magneto from the states and am having a little problem timing it.
The unit itself is a work of art but when it came time to mount it, thats where the problems began.
Instructions said to remove the left side cover and mount the drive adaptor to the shaft running through the cam. First problem. I removed the cover to find no shaft running through the cam at all, no points, nothing. It had some aftermarket system fitted (not very well) causing it to run like a pig, thus why I went for the mag.
I spun up adaptors and through shaft on a lathe out of some old forward control shafts and it seems to run ok. I just want to double check the timing now.
As with old points gear, a normal 12v light bulb across the points is ok to static time it but when the Magneto cover is removed, the points actually come loose. The pivot for the points is in the cover. The closest I can get is shine a bright torch throught the cover and try see when the points open.
Next problem is the timing mark. I've read heaps on here about the timing marks for the 79 model but something doesn't quite click.
On the internal rotor, there is a fixed mark. On the removable case, there is a metal tab marked F and T held on by a small screw. What I don't understand is why this metal tab has a slot in it to slide back and forth approx 13mm or 1/2"? Not sure how I can time it if I don't know extactly where this plate is supposed to be?
Main reason to double check the timing is when it runs, it backfires through the carbs so savagly that the foam airfilter pods have blown out! I've checked compression (ok), valve clearance (done), cam tensioner (perfect). Carbs are new from MikesXS. I've set them up to pull at the same time using a 2mm drill bit in each carb to check the slides move together. I want to stick vaccuum guages on it but need to modify the new inlet manifolds to allow for a vaccuum port. Thats next if I can get the timing sorted .
Long winded way of saying I'm kinda stuck here. As I said, living in Vietnam makes it difficult to 'duck down the dealership or wreckers' to grab something. This XS is one of 2 in the whole of Vietnam and they are both mine. Had heaps of pictures taken of it when I go out but the backfiring makes me a bit scared (the flame is too close to my nuts!!! )
Any help would be greatly appreciated folks!
Since I live in Vietnam and there is no local dealer to take my XS bobber to for constant repairs (and motorcycle boots are not made for walking long distances in), I decided to go for the magneto setup.
Got the Morris Magneto from the states and am having a little problem timing it.
The unit itself is a work of art but when it came time to mount it, thats where the problems began.
Instructions said to remove the left side cover and mount the drive adaptor to the shaft running through the cam. First problem. I removed the cover to find no shaft running through the cam at all, no points, nothing. It had some aftermarket system fitted (not very well) causing it to run like a pig, thus why I went for the mag.
I spun up adaptors and through shaft on a lathe out of some old forward control shafts and it seems to run ok. I just want to double check the timing now.
As with old points gear, a normal 12v light bulb across the points is ok to static time it but when the Magneto cover is removed, the points actually come loose. The pivot for the points is in the cover. The closest I can get is shine a bright torch throught the cover and try see when the points open.
Next problem is the timing mark. I've read heaps on here about the timing marks for the 79 model but something doesn't quite click.
On the internal rotor, there is a fixed mark. On the removable case, there is a metal tab marked F and T held on by a small screw. What I don't understand is why this metal tab has a slot in it to slide back and forth approx 13mm or 1/2"? Not sure how I can time it if I don't know extactly where this plate is supposed to be?
Main reason to double check the timing is when it runs, it backfires through the carbs so savagly that the foam airfilter pods have blown out! I've checked compression (ok), valve clearance (done), cam tensioner (perfect). Carbs are new from MikesXS. I've set them up to pull at the same time using a 2mm drill bit in each carb to check the slides move together. I want to stick vaccuum guages on it but need to modify the new inlet manifolds to allow for a vaccuum port. Thats next if I can get the timing sorted .
Long winded way of saying I'm kinda stuck here. As I said, living in Vietnam makes it difficult to 'duck down the dealership or wreckers' to grab something. This XS is one of 2 in the whole of Vietnam and they are both mine. Had heaps of pictures taken of it when I go out but the backfiring makes me a bit scared (the flame is too close to my nuts!!! )
Any help would be greatly appreciated folks!