Rehashing this thread. I'm at 8,800 miles and will get close to 10,000 miles when the season is over if things continue as they are. I have changed my top gear once, BOP driveshaft saver since 2,000 miles, original track, some wheels ( went to J&T this year), rebuilt shocks before last season but only did 450 miles, changed plugs, original clutch with machined secondary, TP rollers, glide washers and springs, and have been running max spool 17 for 5,000 miles. I do not go flat out to the bars but every so often. I run half to 3/4 most of the time with the occasional squeeze when necessary. I go through the sled thoroughly every season. This year everything looked good and it is running great. Should I be replacing things other than the known stuff, like the chain, lower gears, shaft, clutch to stay ahead of any issues or if it looks good keep running these parts. Of course a i lean toward new but with these supply chain issues I have the Apex race ready if need be.