I have sent my last set from here, if you want a copy and you don't email me at: firstname.lastname@example.org then don't come here complaining I didn't respond. I will no longer respond to a request for a copy in the forum only at the email address listed.
These are for a small 30-50cc weedeater/scooter style motor, but may provide you with some tips that can be adapted to a larger motor. These are not for a lawn mower motor style longtail.
These plans are not entirely mine. There is a member named Turn4fun/ripped off, I just modified his plans slightly and them put them in PDF form.
Feel free to share them, I don't always check that email account.