BOLD MAGENTA part numbers are new for 2026 ENGINE PARTS-UNLIMITED.COM STREET | 2026 ENGINE 1451 DISCLAIMER: *EMIS (EMISSIONS CATEGORIZATION CODE). SEE PAGES 4-6 FOR CATEGORY CODES, IMPORTANT EPA/CARB EMISSION DEFINITIONS AND REGULATORY COMPLIANCE AND NOTICE REGARDING NOISE REGULATIONS. PRODUCTS NOT LEGAL FOR SALE OR USE IN CALIFORNIA ON ANY POLLUTION CONTROLLED MOTOR VEHICLES IF NOT CATEGORIZED AS “1” OR “4”. DESCRIPTION PART # 1.1 bar (16 psi) 1903-0005 1.6 bar (23 psi) 1903-0017 DESCRIPTION PART # 1.8 bar (26 psi) 1903-0018 2.1 bar (30 psi) 1903-0019 RADIATOR CAPS •Old and faulty radiator caps can cause steam and fluid to be pumped out of the radiator overflow hose •A replacement cap is the least expensive and easiest way to solve or troubleshoot your liquid cooled bike/ATV radiator problems • Upgrading to a high-pressure 1.6 bar, 1.8 bar or 2.1 bar from the stock radiator cap is the simplest and least expensive way to avoid over-boiling your engine •Raising your cooling system’s maximum operating pressure increases your coolant’s boiling point, allowing you to ride harder and longer •Black finished cap •Universal fit for most Japanese models •High-temperature corrosion-resistant silicone seals DESCRIPTION PART # Standard radiator cap, black 1903-0009 Standard radiator cap, zinc-plated (gold) 1903-0008 DESCRIPTION PART # Grip-style radiator cap, chrome 1903-0010 STANDARD-PRESSURE RADIATOR CAPS •High-temperature silicone seals •Stock-pressure rating of 16 psi (1.1 bar) •PART #s 1903-0008 and 1903-0009 are stamped with metric pressure rating of 1.1 bar •PART #1903-0010 includes high-temperature metal film warning decal and adhesive and features grooved edges for grip; pressure rating printed on cap in standard 16 psi and metric 1.1K • Universal fit for most Hondas, Kawasakis, Suzukis and Yamahas DESCRIPTION PART # 13 psi (gold) 1903-0016 23 psi (red) 1903-0011 DESCRIPTION PART # 26 psi (black) 1903-0029 30 psi (black) 1903-0030 HIGH-PRESSURE RACING RADIATOR CAPS •Engineered to increase pressure in cooling system, which then increases coolant boiling point; helps prevent boil over •Chrome cap with grooved edges for grip; pressure rating printed on cap in metric and standard psi •High-temperature silicone seals •Includes high-temperature metal film warning decal and adhesive •For competition use on most Honda, Kawasaki, Suzuki and Yamaha 1903-0008 1903-0009 1903-0010 1903-0005 1903-0016 1903-0011 1903-0029
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