03 YZF450 Hesitating wide open


7 replies to this topic
  • RacerDad

Posted February 18, 2006 - 06:58 PM

#1

03 YZF450 hesitating under power while wide open. It just started doing this. Seems to run fine in 1-3 gears in most track stuff, but in 4th gear, nearing wide open on last couple of GP races it has a scary hesitation. Feels like it's jumping teeth on the spocket (which it's not) just to give you some sense of how it feels.
Quick History: Oil changes every 3rd ride/race. Air filter every ride/race. Never touched the carb, never checked the valves. Bike starts 1st kick after sitting every week. Just changed the plug today & thats not it. The bike is ridden/raced at least 3-4 times per month. I bought it new in June of 2003.
Please give your thoughts.
Hey greyracer513, looking for your thoughts on this one.

  • kid on a 426

Posted February 18, 2006 - 06:59 PM

#2

maybe clutch

  • grayracer513

Posted February 18, 2006 - 07:52 PM

#3

It sounds like jumping in and out of 4th gear due to worn gear dogs. Not common on a 450, but possible, nevertheless.

  • 642MX

Posted February 18, 2006 - 08:26 PM

#4

It sounds like jumping in and out of 4th gear due to worn gear dogs. Not common on a 450, but possible, nevertheless.




Thats what I was thinking.




Time to open her up and see whats broke.

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  • Ga426owner

Posted February 19, 2006 - 06:51 AM

#5

I also would consider a new top end (if never done)w/ cam chain and CCT replacement, a valve check and a complete carb cleaning..........racing/riding 3-4times a month since june 2003.........it is definitely time

  • RacerDad

Posted March 06, 2006 - 10:59 PM

#6

It sounds like jumping in and out of 4th gear due to worn gear dogs. Not common on a 450, but possible, nevertheless.


Thats exactly what it was. Took it to Pro-Tec http://www.pro-tecperformance.com/
They replaced 1-4 gears while they were in there, new piston & rings, adjusted the valves (he said they were almost still adjusted fine) went through the carb. Picked it up on Friday, raced it on Sunday at Glen Helen in Big 6 GP. Bike ran very strong. And I'm very happy with Pro-Tec. (my first time there, I was refered by 2 friends). :thumbsup:

  • Matt96xr6

Posted March 07, 2006 - 07:20 AM

#7

now you have to change your oil more often. Every ride.

  • jimmyg

Posted March 07, 2006 - 06:23 PM

#8

i would say bent shift fork it happend to me the same way.





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