Nice work Mike! Beautiful bike! Worth the investment I'd think.
De-Cell popping is normal but really noticeable when running a loud pipe. Ditch that pipe! Changing jetting can alter popping but for the most part it will be there
no matter what.
Best look to 640 experts for suggestions on opening air box, changing needle and re-jetting. If done right, the BST40 carb has a lot of potential to get the most out of your bike ... and still get decent fuel economy. Lots of options.
There must be other pipes you can run that breath well but aren't obnoxious.
Good luck, keep an eye on the head gasket, rockers and valve clearance.
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