1975 xs500 bobber I just bought wont start..?

[frogdink]

So I bought a 1975 (I'm told 1975) Yamaha xs500, that has been chopped and cut and changed in every way that you can imagine.....it was only $200. So I cant get it to start, and I had spark at both cylinders, so I took the carbs off, they were full of yellow jelly...cleaned everything, jets, etc. put them back on last night and now it still wont start and i only have spark on one cylinder. I have never got too involved in engine repair, but my guess is, the only thing it could be is a spark/points issue...right? I dont really know where to go from here and I dont want to do more harm than good. It turns over really well with electric start....I dont know...help please... Thanks -Joe

[DGXSER]

Do not know anythign abotu the 500, I assume it uses the same wasted spark as the 1100? So your coil would be good, and now it is up to the high tens wire and the plug to make spark?

I would start with a compression check just to be sure though. The old three required, fuel, spark, and compression.

[tarzan]

I would check the points and condensor

[Geezer]

I would check the points and condensor

I second that and this bike uses a 180* crank so it will have 2 sets of points, 2 condensers and 2 ignition coils... And most likely a cracked cylinder head...

Geezer.

[frogdink]

So I had spark but no fuel, cleaned carbs and now have fuel but spark on only one CYl. What do I do to the points do get spark? They look clean. It starts for a second with starting fluid one that one cyl. Good sign?

[frogdink]

I have checked everything. sometimes i have spark sometimes i dont on thatr one cyl. it must be bad wiring somewhere...

[frogdink]

Stupid question. Im told one set of points is probebly shorting out. how would one fix that?....Thanks for the non sarcastic answers in advance...

[frogdink]

Where can I find a wiring diagram for this bike. Anyone have one they could e-mail/Fax???