maybe Yamaha should of stayed with the 2 strokes and not even touched 4 stroke motors.There is something about 2 strokes that appeal to many..smoke is one thing..love the smell of it myself and easy to rebuild or mod up and lighter propbably.You are into BIG money with the 4 strokes initially and if you have to add a bunch more after 10,000 miles is insane for a sled that cost so much.For an example,my 2001 SXR600 is in GREAT shape for all the rough riding I do with it.I just rebuilt the motor because I wanted to,didn't need to yet as it still ran fine.With all the jumps I have done with it,the rough landings..it has not failed me..nothing has snapped or fallen off it yet..go figure.
I will keep riding my 600 and 700SRX until I can't ride no more.I have no need for them new version sleds out there with more features that can keep breaking down.My SXR is a blast to ride..love it..