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: '09CRF230L (Li'l Red Piglet), '89NX250 (sold)
Propelled by Penguin Power
Nekkid motorcycles feel faster
1st bike: a gently used 1958 Matchless 250 thumper