KEIHIN pilot jet - N424-25B series

KEIHIN offers this carburettor jet. A carburettor mixes the air drawn in by the engine with the right amount of fuel, and it is the jets that meter that fuel.

Why change the jet?

The benefits:

• Match the carburation to a modified exhaust, air filter or airbox.
• Correct the mixture when you ride at altitude or when the temperature changes a lot: thinner air, smaller jet.
• Replace a blocked or damaged jet to get back easy starting and clean pick-up.

Why choose KEIHIN?

Keihin, founded in Japan in 1956 and long nearly half-owned by Honda, supplies original equipment to Honda as well as Suzuki, Kawasaki and KTM; its FCR carburettor, whose flat slide runs on roller bearings, was developed in Superbike racing.

When should you replace this part?

A jet blocked by fuel deposits or dirt, or with its orifice enlarged by cleaning it with wire: the engine is hard to start, idles unevenly or stutters at full throttle.

Specifications and fitting tips

Available in several sizes.

Cross-Mania tip: Start from the stock size, change one step at a time and check the spark plug colour and how the engine responds after each test; screw the jet in without forcing it, as its thread is fine.

Compatibility

Universal part: check the dimensions given before ordering.