Nikki Vaporizer Assembly K21/K25 – NI16310-GY361

This vaporizer and regulator assembly is manufactured by Nikki for Nissan K21 and K25 propane engines, converting liquid propane drawn from the tank into vapor and regulating the delivery pressure feeding the carburetor. This conversion step is essential to how an LP engine runs; liquid propane cannot combust directly, so the vaporizer's job is to flash it to gas and hold delivery pressure steady across changing engine load before it ever reaches the carburetor.

Because the K21 and K25 engine family was used across multiple truck manufacturers, this same vaporizer assembly fits propane-powered lift trucks built by UniCarriers, Komatsu, Caterpillar, and Mitsubishi in addition to Nissan-branded equipment, making fitment a matter of engine family rather than truck brand alone. As the vaporizer's internal diaphragm and seals age, common symptoms include rough idle, hesitation under load, or inconsistent power as pressure regulation becomes less precise.

At 5.4 pounds, this is a complete assembly rather than a repair kit, replacing the full vaporizer rather than individual internal components. Ordering against the manufacturer part number, confirmed against the Nissan K21/K25 engine fitment, ensures the correct assembly for any of the truck brands built on that engine platform.