I finally got a chance to take the new derbi out for a ride. I have been starting it on the stand and letting it warm up for a pre break in. I started it tonight let it warm up and started going around the block and the pickup is insane. Never felt that much power from a moped. About half way around it makes a weird pfffffft discharge noise stalls then starts right back up like nothing happened. Is my decompression valve not adjusted and could it be leaking.
It has a new Metra 65 with a 16mm Dellorto PHBG Zen pipe and a TJT setup