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3R1   3R1   YZ80G   1980   W

https://www.motorcyclespareparts.eu/en/yamaha-parts/yamaha-model-prefix-motorcycles-1970-1994

What I've noticed, if you find the date on the wheel, bike production 2 months later. my rd was like that and kawasaki triples were like that. Not sure if the rd350 wheels have date codes though.

I've had decent luck using mothers aluminum polish. try it in a small area. I use the same thing to polish hazed auto headlights and works great for that too.

One carb should be a master or not adjustable and you match the remaining, you close off the valves to get gauges to stabilize.

I believe they are like "chokes" to dampen needle movement.

Just like all the other KH750's out there 

I kept needle in mid position and if I remember right about 1 turn out on Air screw. besides surging a bit on decel ran great. switched to chambers and 145 mains and god rid of the surge and runs even better :)

When mine was bone stock with the same airfilter, 130 main 32.5 pilot.

I bought one of these, fits good now working on paint :)

https://japan.webike.net/products/23087733.html

I've seen several sets of the K2 Tec pipes for other bikes in the clear coat mild steel, it seems to hold up pretty well.

I had thoughts about Ben Spies maybe doing well, but ah that didn't happen lol

more than likely a mag coil, kicker can't spin it fast enough to create voltage.

could be the magneto coil going out when hot too.

piston has exhaust ports 

or even a 76 kz750 twin :) but actually it's a kz rear brake rotor 76 thru 79 I think. Kz 650,750,900 and 1000