Is the internal gearing different between the 2000 and 2008 models?
I have a 2008 model, and my father has a 2000 model. We went trail ridding this last weekend, and his did much better on the steep trails, but mine much better on the highway and mpg. We traded bikes a couple of times to make sure it wasn't the rider. We initially thought that the sprockets may have changed between the years, but we counted both and they both appear to be a 14 tooth front and 50 tooth back. Was there a change on the internal parts, or is there something else that may account for this difference?
I can explain it to you, but I can't understand it for you.
Powdercoated '87 frame, extended swingarm, YZ fork legs, ATV tire, 14/55, XT350 tank, spliced quick-release seat, disc brake conversion, beeg headlight, beeger rack, Lizrdcooler, Lizrdventz and bunch of other stuff all covered in invisible ink.
Without knowing this to be fact, i would guess the emission standards tightened up between 2000 and 2008. the 2008 probably is jetted leaner which would account for the better mileage and less torque. I opened the idle jet up on my 09 and it idles much better and seems to have a little better throttle response at low rpm's. plan is to go up 1 size on the main jet next.
1993 Shadow 1100 with Ural sidecar
2008 H-D Ultra Classic
2009 Zuma 125
2004 Zuma 50