I bought an 08 SYM HD 200 over a year ago. It had just been serviced and I have put 2000 miles on it. The SYM dealer in San Francisco is really expensive. and I wanted to know what parts for a tune up other owners would recommend. The manual is a bit confusing as it has 125 and 200 and is translated Taiwanese. is there an air filter that will fit other than the one from the dealer? What spark plug do you recommend. My friend wants me to convert to synthetic oil. Is that a good idea? How often should the dear oil be changed? Thanks for your help I am pretty new at scooter riding. any tips would help. Robert