Originally Posted by morrissey_shawn
hi folks I need some input has anyone out there done a mod on there carb like the stage 1 or 2 or soforth ive only installed a dg r exhaust starts good seems to rev nice but haven't tried it since we have a lot of snow I live in labradoe with the altitude of about 2000 above sea level if any one tried this or any other mod please let me know ,ive also heard about the 22 cent as well but cant seem to find the correct washers for the needle jet but I rather do a good and full proof mod .thanks
Your bike, M. S. !
My riding partner has 55,000 miles on his '08; performed the 22-cent mod early on, but restored the carb to stock condition soon after. He's satisfied with performance, and reports better fuel mileage with un-shimmed needle (he MAY have left the slide vacuum port enlarged).
Full disclosure; I have the 22-cent mod, one # 4 washer needle shim on my Generation 1, and I'm satisfied with the change (starts and runs fine; mileage in the high 40's, mpg wise).
Since you changed the exhaust, you may want to look at your main jet (lower exhaust restriction may want a larger-diameter main jet). Shimming your needle should do no harm, IMHO; one or two # 4 washers (I think they're between 0.025 and 0.035 inches thick; Google would confirm) shouldn't hurt anything, and the operation's not precision-sensitive, IMHO. Raising the needle merely fuel-enriches the mixture in mid-range operation.
Drilling the slide seeks to improve throttle response, by enhancing the vacuum port. If you don't like it, you can J-B Weld it back and re-drill.
Best wishes on any hop-up/modification you decide to execute; you're the only one to satisfy!