noise on decel

wayne klodowski /

1977 puch, I installed a 70cc airsol kit, came with a carb cylinder head piston and exhaust balanced crank shaft with needle bearings, I case matched the block,it took a while to get it to run good, so im still on break in rides, but on decel it sounds like the piston, or something is clanking around.. almost in time with exhaust . I was also wondering what plug and heat range to run, the timing is at 16 degrees, cant tell what the jet size is , not marked, maybe due to the inexpensive airsol kit, any help would be greatly appreciated (edited)

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