Re: 42 miles of He.....
Take a deep breath and count to ten. Now start with the basics. You said it yourself you did all the mods yourself, Think about what you have done to this little engine. Give it some TLC and it will all work out. Four stroking is normal at some point in your ride. Check out your chain tension and also look closely at your exhaust gasket too. these are the problems I had with mine when it was doing the same thing. found the exhaust gasket had a hole and tore open on bottom. made it sound as though the motor was gonna run off the bike. If you are having problems just ask us we will help out as much as we can. Also what is your fuel mix ratio? that could be a factor in the four stroking too.
Hope it Helps. I am also a proud member of the 20 MPH. club