Jets for tuning the carburation on KTM two-strokes: a BIHR jet box for KEIHIN PWK carburettors, and MIKUNI MKA-type jets sold individually.
The main jet sets the mixture at full throttle, the pilot jet at small openings. Jets are changed after fitting a different exhaust or air filter, for riding at altitude or in hot weather, or when the engine pinks (too lean) or blubbers and smokes (too rich).
Change sizes in small steps and read the plug colour after a test ride. Before ordering, note the make of your carburettor (KEIHIN or MIKUNI) and the original jet number: jets are not interchangeable between makes.
See also KTM two-stroke carburettor repair kits, carburettors, reed petals and reed blocks.
