so i have gotten this beat up and non running puch newport, 77', to run. it excelerates great and has a decent top speed. the only problem i am now having with it is that when i get to about 23-25 i get this high pitched banging sound coming from , what i think., the cylinder. i have never taken the cylinder apart on any ped so i am a bit leery about ripping it open. can anyone help me on this , any other opinions on what this sound could be?
like i said it runs fine, idles beautifully, and doesnt make any strange sounds untill i hit 23-25.
1977 puch newport 1.5HP