4-Stroke Competition Bikes Service Coupon 4-Stroke Competion Bikes Service Coupon Get $25 OFF a valve clearance inspection and adjustment. Get $50 OFF the more comprehensive service: Valve clearance inspection and adjustment. Inspection of rings and pistons Valve seat inspection Valve oxide coating inspection* Disclaimer: This coupon must be presented at the Service counter when you bring your bike in for service to receive the offer. This offer cannot be combined with any other offer or discount. Present this coupon to: Motosport Hillsboro 809 NE 28th Avenue Hillsboro, OR 97124 Select File and Print to print your coupon. (PC Ctrl+P or MAC Apple+P)