03 yz450f issue

3 replies to this topic
  • chris35moto

Posted July 19, 2011 - 04:09 PM


I just traded my raptor 350 for a 03 yz450f. I love the bike, the things an absolute beast. Ive just been having a stalling issue with it. The bike keeps stalling when i brake very hard. At first i thought it was just me being sloppy with the clutch, but then i tested it in a straight line with the clutch pulled to the handlebars and it still stalled. I'm thinking the float level may be off but i haven't pulled the bike apart yet. I'm just wondering if this is on common issue on the 03-05 yzs.

Also, whats the proper clutching technique for coming out of corners on a four stroke? I'm used to riding a two stroke so Ive been feathering the clutch to control the bike coming out of corners, but i read that doing so may be bad for the clutch.


  • LemonDrizzle

Posted July 19, 2011 - 04:22 PM


Might just be really rich on the pilot jet. Try leaning out the mixture screw and see what happens. BTW, the mixture screw is a fuel screw so turning it in is lean and out is rich.

On the clutch note, I just switched from a 2 stroke also and one thing I have noticed with the four strokes is that the power is so much easier to control. I'm no pro by any means, but so far I just tend to dump the clutch and control my exit with the throttle. I ride on mostly hard packed clay and it seems to work. Like I said though, I'm no pro by any stretch of the imagination. I'm sure there are others that ride way better than me that may offer different advise.

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  • grayracer513

Posted July 19, 2011 - 06:38 PM


Float level high or idle adjusted too rich. Idle could be too low, too, but too rich is more likely.

  • yzdaddy

Posted July 22, 2011 - 05:22 PM


i second grayracer 513. check idle first

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