The Versys is fuel injected and has no replaceable carburator fuel jets. It normally runs a bit lean at lower rpm's, and progressively too rich at higher rpm's, stock or not. When using a Dynojet Power Commander, the lean low end is cured, but with a loss in fuel mileage. A higher flow air filter helps a bit, as did my airbox mod. I started off with a complete Muzzy header and slip-on, so I can't compare to stock.I'm wondering if better air filter would help, or might after market pipes do more. It wouldn't help to do too much along those lines or the bike would get too lean and need new jets - defeating the purpose.
Re: speedometer and odometer accuracies. With the 16T my speedometer is dead on. I checked it on the highway last weekend and it was perfect with a measured mile. Then this morning the police put a device that flashes your speed in front of one of the schools. I approached it at 30mph, and the sign showed 30. When I dropped down, my speedo and the sign went to 29 at the same time. It doesn't get better than that.
I also checked the odometer on the highway and it fell short by just over 0.3 miles on a measured 10 mile run - 3% off. So I'll have to figure that into my MPH calcs.
A way too long post. :thumbdown: But back to - new air filter or new pipes do much?