Well, time to learn ? I did my first valve adjustment last summer, have to take off ALL the plastics on my scoot to get to the darn things. But it had to be done. Print out the guide, go step by step..you should already have the tools ( if you own a Chinese scooter you need the tools ) and the feeler guage is only about $5 if you don't have one. If it's not the problem, then it didn't cost you anything but time. And you learn something new. And while you have the thing apart look for any loose connections, ha

( sorry Fox, I can't get past the thing about the electric start working sometimes after jumping around on it )