669 Drive belt used on most TrailMaster MID-size karts.
Look at the top of your belt for the number 669 or 725.
The 669 belt is a 1/2″ shorter than the 725 and is the most common for the Trailmaster line of mid-size karts (mid-xrx, mid-xrs, blazer200).
The 725 belt is used on the TrailMaster MidXRXR model with reverse and on HammerHead 80T and Mudhead karts.
QINJIANG DRIVE BELT 669 X 18 X 30 FOR MOST 4-STROKE QMB139 / GY6 ENGINES
Hammerhead part # 9.110.669