Health is wealth!
So you say you've never even heard a pop out of thus thing yet? That is surprising, because i have seen these motors trying sooo hard to start up, even with filthy carbs, poor compression, even with only one plug write attached! i recently picked up another 1980 g model which had Been sitting for 18 years in storage, still had gas in the tank! The motor was also stuck. All i did was drain the gas, replace the oil, press firmly on the kick starter to loosen the motor up, and it "popped" for me on that first kick! (of course, i pulled the carbs and degunked them, installed inline filter, and replaced diaphragms and carbholders before she started running right.)
My guess is that there is a fuel problem of some type. The carbs run factory lean, and for some reason, both sets of carbs i have encountered had float needle adjustments that were starving the system.
My suggestions:
1) Start using the kickstarter (moves motor faster initially, which will improve chances of starting). Do not engage throttle unless you get some popping, and then, only a little. If no change in result, try toggling the coke to half choke. With no change try full choke. Still nothing? Lets move forward...
2) pull carbs. remove all jets. soak and clean all passages with wire guage cleaning set and air compressor.
3) check float height. Should be 26.5mm above gasket seat.
4) install new alcohol resistant fuel line between carbs, and from tank to fuel rail.
5) install in line fuel filter (clear if possible. Slows you to see the flow of gas!
6) set idle. Sync. Set mix. Set idle. Check sync. Now set timing. Set idle.
7) ride the shit out of her!
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