09 YZ450F Accelerator Pump Adj Screw?

4 replies to this topic
  • joshuathomas

Posted April 19, 2013 - 01:02 PM


I just bought this bike a few weeks ago and i just dialed in all of my jets and i have a some bog in quick acceleration and i want to check my AP timing and i see that everyone talks about the AP adjustment screw and even in my manual they show how to check it. BUT for the life of me, i dont see / cant find my adj screw. I attached some pics hoping someone can help this blind bastard locate this screw.

P.S- this is a Keihin Carb if that matters at all


aft looking forward.jpg

Right side of Carb2.jpg

Rt Side of Carb.jpg

  • grayracer513

Posted April 19, 2013 - 01:49 PM


If this is an '09, why is the frame next to the chain steel?

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  • joshuathomas

Posted April 19, 2013 - 08:19 PM


I dont know, I bought it off craigslist, this is my first Yamaha and I was told it was an 09, i wouldnt know how to tell if it was or not, nor would i have second guessed it either really??? And when you say frame next to chain steel, i have no idea what you are talking about, but you now have me wondering what the heck is going on????

So i guess i have two questions,
1. How can i tell what year this bike is?
2. Where is my AP adj screw? Or do i not have one?

  • grayracer513

Posted April 19, 2013 - 08:27 PM


Look at the VIN number. What is the tenth character?

Post a picture of the bike?

  • joshuathomas

Posted April 20, 2013 - 04:50 AM


I am sorry, i dont know what i was thinking. This bike is an 03', i dont know why i was thinking an 09'. I will go and try to search "the correct" threads now for my bog issue. Sorry for wasting your time.

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