Jetting

Main: 180

(182 stock) Pilot: 42 Needle: OBELR

Clip position: 4th from top

Fuel screw: 2

Leak jet: 90

2004 YAMAHA YZ250F JETTING Main: 180 Pilot: 42 Needle: OBEKR

Clip position: 4th from top

Fuel screw: 1-1/2 turns out Leak jet: 90

2003 YAMAHA YZ250F JETTING Main: 178 Pilot: 42 (40) Needle: OBELP

Clip position: 4th from top (4th stock) Fuel screw: 2 turns (1-5/8 stock) Leak jet: 100

2002 YAMAHA YZ250F JETTING Main: 178 (162 stock) Pilot: 40 Needle: OBEKP

Clip position: 4th from top (4th stock)

Fuel screw: 2 turns (1-5/8 stock) Leak jet: 90 (100 stock)

2001 YAMAHA YZ250F JETTING Main: 175 Pilot: 42 Needle: OBELP Clip position: 4th from top Fuel screw: 2 turns (1-1/2 stock) Leak jet: 95 (105 stock) □

2009 YAMAHA YZ250F JETTING Main: 178 Pilot: 42 Needle: NHKR Clip position: 4th from top Fuel screw: 2-1/2 turns out (2 stock)

Leak jet: 70

2008 YAMAHA YZ250F JETTING Main: 178 Pilot: 42 Needle: NFPR Clip position: 5th from top four-stroke of the modern era, the Yamaha YZ250F has had the most development and refinement time of any bike on the track. Its jetting specs have evolved slowly over the last nine years (and the 2009 model isn't all that different from the 2001 YZ250F). This is testimony to Yamaha's thorough test program. They are very good at getting it right the first time and then making it better with each passing year.

As with every jetting guide, there are caveats about temperature, altitude, riding style, hop-ups and personal taste. Our numbers are suggested starting points for motocross racers (the stock jetting, when changed, is included in parentheses). The fine tuning is still up to you.

377 aîlSTOPHE POURCEL MONSTER ENERGY PRO CIRCUIT KAWASAKI

2009 5UPERCROSS LITES EAST CHAAHÉftN

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