I'm new to this forum, but have been studying it for a year now. I have a 1980 GS450S with 6,000 miles. It was stored for 30 years, I am trying to get it recommissioned to ride. Here's what I've done so far:
Cleaned carbs by dipping in Berrymans (twice), replaced o-rings, needle and seats (genuine Mikuni), floats, adjusted the float height to the lowest fuel level within spec. Adjusted idle screw to 1 1/2 turn out. Replaced all jets with genuine Mikuni of the correct sizes. The airbox is original with a new filter. The exhaust is original, the bike is unmolested.
The entire ignition system is new from battery to spark plugs (Dynatek), the timing is correctly set. The cylinders have 150 psi compression on both sides. The bike starts up very fast, especially when cold. No enrichener is required. The left cylinder spark plug runs very black and sooty. I have swapped the needle and seats and floats from one carb to the other with no change. When running, the engine sounds strong and healthy, after warming up some, it starts to "burble" from 1-cylinder. One original float was sunk, I replaced that. The airbox was incomplete when I got the bike. I suspect PO was trying to "lean it out" by removing the lid, filter etc. which it does do. So.....where do I go from here? I appreciate all responses and guidance. Thanks GS450SJIP
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