So here is my quick walk though in putting crank seal in the clutch side of a G1.
Step 1. remove the gas tank
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Step 2. remove the outter clutch cover via the phillps head screw
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Step 3. Remove the long bolth holding the outter clutch plate one (7/8" head)Remove the outter clutch plate
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Step 4. Remove the drive belt and starter belt.
Step 5. Using a clutch puller (can be bought or you can make your own. I bougth mine) remove the inner clutch plate/shaft
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Step 6. Remove the oil pump gear houseing and pull BOTH the inner and outter housing off of the engine case
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Step 7. run a screw into the seal and using a claw hammer pry the old seal out.
Step 8. put the new seal in (put some oil on the part of the seal where it slides on the crank shaft to keep it from catching and tearing).
Step 9. Reinstall everything the way it came off.
Hope this helps