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I'm the owner of several 960s and I can tell you that they typically run nice and smooth w/o any additives, so there may be something amiss with your fuel (water, old fuel, etc). I did have a helluva time with old fuel when I bought one car a few years ago. That car failed emissions tests and passed once I got a new tank of fuel to mix with the old and run it through the engine.
Seafoam works wonders in old motorcycles, though! Mine started after 2 years of dormancy with old fuel in the tank after I added SF to the tank and let it run through the carbs for a bit.
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