2013年7月10日 · most likely rich if the pilot is stock. A 290 will create more vacuum when the throttle is closed, thus pulling in too much fuel from the stock pilot. Is jetting still stock? Have you tried adjusting the pilot screw? Maybe try searching the jetting database for similar big bore kits.

2009 yz250f with 290 big bore Rode a few times last fall hasn’t been started since Lots of power and sounds great when ran Carb leaks, might start if...

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YZ 250f fresh motor less than five hours on 290 big bore rebuild kit. Tires like new, motor is really strong and just breaking in. $3300 obo I don’t think this is a beginners bike by any means. Not sure what all they did with the rebuild but has less than 7hours on motor and was told that it …

2009年12月21日 · Just for info, I purchased a 290 kit and it comes with Wossner (German company i believe)Piston. the piston is a 2 ring type and has a coated skirt. will be installing it on wednesday ?

i just bought a 07 yzf 290! I love this bike it is fast a has a lot of bottom end power. My ? is should the head pipe be turning blue or is the bike to lean but it starts easy hot or cold and what should the sag and free sag be.

Hi I’m selling my cross bike Yamaha YZF 250 cc with a kit 290 cc Selling due to upgrade Bike work ...

Featuring a high-spec piston, aggressive cam profiles and forward positioned intake cylinder head layout, the YZ250F's advanced four-stroke engine is known for its broad, useable powerband and class-leading low-end and mid-range torque.

1,074 articles Échappements, Carosserie, Pièces de Moteur et Pieces de Guidon et Contrôle de HEPCO&BECKER pour YAMAHA YZF-R125. Stocks énormes, expédition mondiale rapide directement du Japon.