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Cameron;
I'm happy to hear that you solved your overheating problem...I love it when when a plan comes together (or a problem is finally put to rest).
My compliments also on a nice website dedicated to your 122.
My B16 experienc is very limited, but I will definately chime in on the hard cold start problem...A working, well adjusted choke is important on SUs because of their marginal atomization at cold, low flow (starting) conditions. [See also: http://www.intelab.com/swem/checkchoke.htm ...article deals with HS6s but should still be helpful]. But I don't really believe that's the problem...30sec cranking is a long time which suggests that the fuel bowls may be empty (leak, syphon, etc, ?), and you have to pump them full before you have any hope of starting...remember, under normal conditions, you start on fuel that's still in the bowl from last time you ran, not fuel pumped up during starting! I suggest removing filters, and while using a remote starter to crank, look down carbs and see if you notice fuel immediately or after ther the 30 sec crank. That should tell you functionally if bowls are some how getting emptied...if yes, that suggests a pump probem.
Good Hunting.
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