Arange of qualitytools for engine maintenance. COUNTER BALANCER & CLUTCH HUB SPANNER FOR HONDA 20mm - Replaces 20mm end of Honda OEM tool 07716-0020100 - Used to remove Honda OEM nut 90231-KY4-900 - 4-Pin spanner made of heat-treated steel - Inside diameter is 20mm - Use with a 3/8" driver - Fits Counter Balancer Nut on: CRF450R 02-07, CRF450X 05-08 Fits Clutch Hub Nut on: PC50 69-70, Z50 68-99, S65 65-69 Fits Crank Shaft Nut on: CA100 (Trail 50) 61-62, CA102 62-69, CA105 (Trail 50) 63-65, CA110 62-69 Fits: Honda CRF450R 2002-2006 Z50 1976-1978 Z50R 1982-1999