1981 xs650 rotor

Well i did some checking and the rotor resistance is 4.2 ohm and I have
about 11.56 volts at the brushes(battery alittle low I think). There
seems to be about 1/2" to 5/8"(good guess without measuring)gap between
the rotor and pick-up coil. This seems like alot to me. I have verified
all componants work for the ignition system but I just dont get any spark.

I do have a clymers manual and I have posted question of these forums
you have suggested but no replies as of yet.

 

http://650motorcycles.com/ignitions.html shows one shot of the stator
and pickup. 1/2" sure seems like an awful big gap. Wonder if it's
supposed to be a glued on magnet ?

Best of luck and remember "do no harm".

 

OK.... Got the problem solved with the issue of no spark.

In the case where the the stator mounts is a small pin. This pin kept
the stator assembly from going all the way onto the rotor(remember I
thought there was too much space between the pickup coil and rotor). I
removed the pin and the stator went another 1/4" onto the rotor. Since
the pickup mounts on the stator this caused to much gap to the pickup.

Ive got spark now... YAHOO.......

 

Hooray!

 

Er, if the pin wasn't supposed to be there, how did it get there in the
first place? If it was supposed to be there (e.g. to make sure that you
locate the stator properly, prevent it from spinning or something),
what's going to happen now that it's missing?

I don't know anything about this bike, and you're the man on the ground,
but something sounds a bit odd about this.

 

I bought this bike about a month ago at an auction so I have no
information about the bike prior to me buying it. All I know is the pin
prevented the existing stator from seating properly in the case. I
imagine the pin is for something but I dont know what.

 

Maybe you have parts from different year models. The pin should have a
matching hole in the stator, but if it doesn't. that probably indicates
that you have mixed parts. If there is a hole in the stator, maybe the
dowel pin is too long...

The dowel pin is there for one of two reasons. 1) to keep the stator
from being rubbed by the rotor, or 2) to locate the stator precisely
for ignition timing purposes...

 

Thanks for the help... Ill check to see if thee is a matching hole in
the stator....

 

Good call. As Kritter points out, the parts could be different
years, or they could be misaligned. My bet would be that there are
only a couple of ways to assemble the bugger anyway though, so
the trick would be to put it together so the magnet and pickup
lined up probably a hair before TDC. Advance is handled (I think)
by the electronics. Most likely, there are three or four ways to
assemble it depending on the number of bolts and holes.