Package include: 1 x drive belt. Color: black. Material: rubber. Interchange part number: 203591 / Q430203W. Compatible with: Replaces Yerf Dog part numbers: Q43103W & Q43203W. For Comet 30 Series torque converters 3hp to 8hp engines. Replaces Manco part numbers: 203591, 203591A, 203591B, 203591C. Tested under severe environmental conditions to deliver maximum performance in any terrain or weather. New Replacement Part:203591 203591A Q43103W Go Cart Belt 30 Series. Replaces Kartco part number: 7655. Replaces Rotary part number: 10052. The asymmetrical cog belt used on all Yerf-dog go-karts with Tecumseh engines and belt driven torque-converters. For 203591 Q43203W Yerf- dog Manco carter 5.5hp 6.5hp go kart. How to Select the correct belt? 1. Determine the series type. 2. Measure the ”Outer Diameter” (O.D.) of the driven pulley on the jackshaft. 3. Measure the ”Center Distance” (C.D.), which is the exact distance between the center of the engine crankshaft and the center of the jackshaft, must be precise. 4. Use the two measurements, the driven pulley outer diameter and center distance measurement to determine the correct belt part number from the relevant chart below.