1970 Honda Z50 won't start?

It's a pretty old bike, but I had it running great just a few weeks ago. Now it won't start for anything. I checked the spark plug, and it's sparking fine. The timing on the cams is fine, the piston moves correctly. I added a gas filter, and I only buy real gas(0% Ethanol). I took the carb off, cleaned it out, and it all seems fine to me. I just can't figure out what the heck is wrong with it.

If you didn't remove the jets and float needle and clean the separately with solvent and compressed air, then you didn't clean your carb.

Additionally, on a bike that old, closely inspect the intake manifold for air leaks.

Before buying new points, adjust them.
Clean the carburetor, especially the pilot jet.

When you cleaned the carb, did you blow out all the passages with air? As sometimes using carburettor cleaner alone is not enough. Also make sure fuel is reaching the carburettor, and getting into the carburettor. Easy way to find out if it's fuel related, is to spray a little carburettor cleaner or WD40 into the air intake inlet of the carb. Then attempt to start the bike. IF it starts (but will more than likely die soon after), then it's fuel issue. Usually a case of a clogged Pilot Jet and/or passage if fuel is getting into carb.

Simple bike, fuel fire, compression. Try new points and condenser just for giggles

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