This genuine Honda radiator cap seals the cooling system and helps maintain proper pressure in the radiator on the Honda models listed below. A weak, damaged, or incorrect radiator cap can cause coolant loss, overheating symptoms, or poor cooling-system pressure control. Use this Honda radiator cap when your parts diagram calls for Honda part number 19045-MZ1-621 or one of the verified superseded numbers. It is commonly searched as a radiator cap, coolant cap, cooling system cap, or radiator pressure cap. Product Details Genuine Honda part Honda part number: 19045-MZ1-621 Honda part description: Cap, Radiator / Cap Comp., Radiator Supersedes / replaces: 19045-GBF-700, 19045-GBF-770, 19037-KA4-701, 19037-KV3-003, 19111-MM9-000, Sold individually Quantity required: typically 1 per radiator assembly Fitment / Compatibility Honda CBR929RR (2000-2001) CR125R (1982-2007) CR250R (1982-2007) Buyer Notes Confirm the number, radiator neck style, cap pressure requirement, and cooling-system diagram before ordering. This is not a universal radiator cap

Replaces OEM #19037-KA4-700

• Restores precise steering
• Cures vague steering or lock faults
• Grease and torque correctly on fitting

Fits

• 1982-2007 Honda CR125R
• 1982-2007 Honda CR250R
• 2000-2001 Honda CBR929RR