Just another thing to check. I've read on another site once a guy had a similar problem, turned out it was loose exhaust pipes on the head.

 

My elevation is around 600-700ft,head pipes are tight,just checked them. where is a good place to start on the fuel-air screw? mine is set at two and half turns out, is that anywhere close? the predetor was beating me by at least 4 quad lenths in about 1/8 mile drags,kinda inbarising! SORRY about typing and spelling, i looked at dirtwheels to much in school!!!!!!![img]i/expressions/face-icon-small-happy.gif[/img]

 

Just so I'm clear on this: How much do you weigh, and how much does the guy with the predy weigh?
I bet this is going to be a tuning issue though.

 

Is your clutch slipping? Everything else that i was thinking was already brought up, good luck with it tho.

 

The stock setting for the air / fuel mixture screw is 2.5 turns out from closed. Most people will run it at 2.5 or 3.0 turns out. I've never heard of anyone running it more opened up or closed than that. So you at 2.5 should be fine. Since changing the needle is free, why not try richening the needle jet? Move the C clip lower onto the needle (Towards the pointed side) and place it in either the 3rd or 4th slot. You might also buy a couple of extra main jets, stock is 165 so I would be a 170, 175 and 180. This way you are covered if you need to re-jet later you wont need to make a second trip to the store.

Let me know how you do, I have a 2003 DS650 Baja as well, though I recently upgraded my carburetor.

What do your spark plugs look like? (What color?) The color of the plugs and the color of the suit that is coming out of your exhaust will tell you how your engine is running.

 

I weigh 135 soaking wet! My bud on the pred weighs 175! I have the avantage there, clutch feels great,no slipping that i can notice. Im gonna pull the plugs today and see what they look like, Il also try moving the needle like you said and see what happens there, i will get back to you guys and let you know if it helped! THANKS AGIAN!!!!![img]i/expressions/face-icon-small-happy.gif[/img]