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Blocking off the bypass directs more water into the block, cooling the engine more. Reinstalling the tstat or going with hotter plugs won't necessarily make it run hotter. I wouldn't worry too much about running cold, just run it long enough to get it warm. Plugs wet with fuel seems to indicate less spark after the ignition components were installed. Perhaps timing needs to be adjusted. I don't know what could cause it to start instantly when cold, but not start when warmed up. Others on this forum will no doubt enlighten us.
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