Motorcycle Repair: 1970 Honda z50k1, honda z50r, camshaft lobes

Question
Hey Bill, my name is Alex, and my father in law and myself are trying to restore a 1970 Honda z50k1.  We are trying to get it to fire up and are having difficulties.  We are pretty sure we got it narrowed down to needing to adjust the timing chain.  We get a spark from the spark plug when kick starting it, but instead of the intake sucking air in, it is blowing it out.  We have taken the cam cover off and have inspected the fly wheel and timing chain.  We believe that it is off by about 180 degrees, but are not sure how to go about adjusting the timing chain properly.  Any help you might be able to offer would be appreciated.  If you need any more details ill be happy to try to get them for you.  Thank you for your help.

Answer
Alex, I found a kind of rough PDF shop manual copy here:
http://www.fullgas4strokesquad.be/images_info/manuals/Honda_Z50R_ShopManual.pdf
Page 38 has a dim reproduction of the cam chain installation and timing image.

Basically, you need to have the crankshaft at the T mark and then the camshaft lobes will be turned so that they are pointing towards the piston. This leaves the valves closed on compression stroke. There is a mark on the camsprocket that goes towards the opening in the head, as shown in the photo.

If the cam timing was off by much and you kicked the engine over, you may have bent an intake valve when it hit the piston out of phase.

Double check your cam timing, adjust the valves at .002" cold intake/exhaust and check compression if you can. If the valves don't adjust up correctly, one or both are bent and the head has to come back off for inspection and repair.

Bill Silver