Originally Posted by dreccles
A K&N Filter and a Stage 1 DynoJet kit change the bike completely! :-)
Lot's more power across the entire rev range and Easy wheelies!
I found that aftermarket pipes did little, the pipe even 'gutted' the low end power for an HP or two at the top-end... not worth it to me.
Originally Posted by 8lives
Thanks for the info STU,I'm all about simple and hardware store instead of motorcycle store mods,and Im cheap and like my fuel mileage to stay good.
If you ride in dusty conditions, as per K&N, you should be using a prefilter. Uni or even stock filter oiled with foam oil works better in dust. As for Dynojet...I use an A/F meter and O2 sensor. Dynojet needle is good but their recommendations for main jet is far far too rich. Your mileage will suffer. I'd recommend you switch to a keihin main in the 142.5 or if mileage is priorty (shouldnt be if you're re-jetting lol) go with a 140 main. Yes, even if you are using the bestest pipe ever made...
Also, Dynojet's recommendation of drilling slide to 1/8" is often too much for some KLR's, If you get stumble when you wick the throttle this is the reason. I recommend 7/64ths.