YZ80A 1990 Model Disassembly

Taking The YZ 80 Apart
Basically all I am doing here is taking the bike down to it's separate components.

I like to use a camera to document how and where parts go because I know I will forget. Below is a picture of how the overflow hose/tube (the yellowed one) from the radiator is routed. The bottom hose has been taken loose and is draining into a funnel back into the coolant jug. The fluid was new and only in the engine for break in period. 

In this picture the routing of the throttle cable and overflow radiator hose.

Here shows electronics from right side and throttle cable as it went behind the radiator itself. This picture will also aid in other items placement as can be seen for future reference.

Left side of the electronics and engine wires going to the stator/flywheel side in the engine. The exhaust pipe is gone but the hanger is still present. 
                                     

The air box has been removed and disassembled for cleaning. Using several ziplock bags and a sharpie marker to label and contain all the bits and bolts and screws etc as it comes off the bike.  Plastic containers are also used to put assemblies in with bagged items to keep together. I bet this box has never ever been cleaned form when the bike was new. It was damned nasty inside and out.  

Here the screwdriver is used as a pointer to show where the ground wire goes.

The front brake and the throttle assembly. See all those white speckles from someone's previous project overspray? That will clean up with some Goof Off spray. Shouldn't give away secrets of the trade but some things are just to great not to.  

Just showing the direction of one of the engine mount bolts (lower). It goes in from left side of bike.

This is the front mount from left side of engine/bike.

Removing A Handle Bar Grip for Reuse
Should have shown this when showing the throttle control and front brake lever. Anyway, to remove a handgrip, that you might want to save, if it's in good shape to reuse after refinishing your bars or putting on a different set of bars. Works on bicycles also. Take a vey small flathead screwdriver and carefully insert it between the grip and the handlebar...

next take some WD-40 with the straw, lever up the end of the grip just enough to get the tip of the straw in there and spray. Insert the driver a quarter way around and do the same. Let it sit for a minute. You should now be able to remove the grip with a twisting motion.

You can see the WD-40 swirls on the bars from the twisting of the grip. Comes off like buttah.

Now back from the commercial break. Lastly, this is the rear mount which also doubles as the swing arm pivot mount, it comes across from the right side of the bike. The other two bolts to the right are for the chain guide that protects the swing arm, this one will have to be replaced as it was worn through.