Join Date: Aug 2011
Location: southern Arizona, USA
Thanked 408 Times in 317 Posts
Considering that you have considerable labor getting to measure the valve clearance, putting in a new spark plug and getting fresh oil and a new filter seem quite sensible.
Conversely, you can get the service manual and do the work yourself if you enjoy tinkering.
John '14CB500XA (Daily Rider), '09CRF230L (Li'l Red Piglet), '89NX250 (sold)
Propelled by Penguin Power
Nekkid motorcycles feel faster
1st bike: a gently used 1958 Matchless 250 thumper