Originally Posted by Jeff Munn
Just picked up a 2008 XR650L to do the TAT this summer. I know this probably has been posted here somewhere, but with over 3000 posts in this thread I just have to ask instead of spending days sorting thru. Please forgive me.
Have read about Dave's carb mods for 2003 and prior carbs. What about 2004 and newer? This PO of this bike de-smogged it, but left everything else stock. Stock pipe. Stock filter. Stock jets. It fires up and runs fine, but I have no basis for comparison and know uncorking the intake and exhaust always help.
So my question is, do the Dave's mods also apply to later models? If not, what are the recommended mods to making it a little richer? The plug shows me it is on the edge of lean. I'd rather start with the filter, removing the snorkel, and doing the pilot/main, but don't know if it needs the disc spacer on the needle. If possible I'd like to leave the stock exhaust, but am fully capable of making it breath a little better without the noise.
Please enlighten me, or point me to a web page that addresses these issues for the later model XR's. Thanks.
I'm very pleased to see you're going to take an XRL on the TAT! I think it'd be my choice if I could have anything. Any way I can help you just let me know. If you haven't seen it already, I suggest you check out the ride report on here by our neighbor and my friend XCrider (Denis). I like how he stitches together a ride report.
All the carbs take the same mods. But the difference in "uncorking" isn't exactly huge. It does make a difference if you really want to run full-bore, but who wants to do that on the TAT? Not me....
I agree with your plan of keeping the stock exhaust. While I appreciate the boost in performance, weight savings, and the throaty tone of my White Bros unit, the stock unit is less bothersome to others along the way. It's a benefit to be able to sneak around without people being able to follow you by your sound. And as Dave says in his mod, his particulars apply to a bike that's been opened up, that of course including performance aftermarket exhaust.
As for jumping into mods, I would be focusing on what particular weaknesses you have personally experienced and wish to address. These guys come a bit lean from the factory in order to pass exhaust emissions standards imposed by our illustrious Federal government. From my experience, what I'd do is exchange the stock #50 pilot jet for a #55, and see how she runs for you. Then based on your anaylsis of the effects of this change, you can refocus your efforts. I'm expecting you'd find this quite acceptable performance to run the TAT.
What is your schedule & plan for running the TAT?