the oil on the fins is not important come from the valve cover and is almost normal on the GZ.

Check compression, if is low check valves.
if the valves are to tight the compression is low and do not start

What do you mean by "approximately"? Forget everything else. This tells me you don't have spark, or it's way too weak, or it's occurring at the wrong point in the cycle. Even if the compression is bad, starting fluid should make some noise.

Test compression by putting you finger over the plug hole and cranking. It should blow your finger of the hole.

Focus!!!

[QUOTE=ImaginativeFig;77694] http://www.youtube.com/watch?v=zlW9c...ature=youtu.be

in this video I was confused :hmm: when you mentioned carb cleaner /starting fluid. just a note carb cleaner does not work as starting fluid.

A wee bit of white gas for a Coleman stove will work as starting fluid. Just a few drops should work.

Ohh! I had to run a car on that stuff once. I think it's about 65 octane! Anything over about 1/4 throttle and it sounded like someone had thrown a handful of ball bearings into the engine!

I once used it to prime a carb in a car. Used too much and it lite off at full throttle until it ran out of fuel. I still wonder why the bloody thing didn't turn into a grenade.

I'm honored to be so high on the list. I'm having trouble keeping track of what's been done as well, and I'm the one who's done most of it.

Make up a To Do List. Keep a record of everything you do. Our bikes have been documented from their first day and it is a tremendous advantage when needing some trivial info that has been forgotten.
Having a record of when, where, why and what things were done and the mileage plus costs incurred are a big help.

Tested compression (local bike shop let us borrow the kit with a $100 deposit), obviously on a cold engine. Got around 50psi. Opened up valve cover to look at them and they aren't moving, least not that I can notice, as we turn the crankshaft (following procedure in the "Valve Clearance" instructions on pg 2-5 of the service manual. Further inspection/experimentation is ongoing

Oohooohoohoohoo. Found the problem, it's a doozy. Will post pics.