Specification: Product Name: Motorcycle Fuel Vacuum Indicator Balancer Material: metal and plastic Size: 15 cm x 10 cm Meter diameter: 7 cm Kolor: blue and black Type: Instruments and Indicators Subtype: Carburetor Balancing Indicator Quantity: 1 set Connecting rod thread size: 1xM5, 1xM6 (Please confirm that the cylinder interface is M5 and M6) Fits John Deere AM103290 tractor Suitable for 2-cylinder machines. Features: -This 2-cylinder vacuum meter will help improve the performance of your motorcycle by providing a user-friendly method of balancing the carburetor at home without having to use additional toolsdzi.Dwa meters can be used individually or together, with a pair of rubber connectors at hand to provide four-way balanceenie.Mosistrong extension rods and a steel back plate make it a durable, essential that will last. -Vacuum indicators allow for easy synchronization and balancing of motorcycle carburetors. -Each unit includes precise gauges mounted on a sturdy metal base for countertop use. - Allows for easy synchronization and balancing of motorcycle carburetors - Each unit includes precision gauges mounted on a sturdy metal base for countertop use, threaded brass carburetor extensions (65 mm and 180 mm), connectors and vacuum hose. The package includes: 1 x Fuel Vacuum Indicator Balancer 2 x Vacuum Hose 2 x Connectors 2 x Threaded Brass Extensions Note: 1. 2. (1 inch = 2.54 cm ) 3. There are no instructions in this kit.