As rich says, stay away from Renthal Alloy sprockets. The XR makes allot of torque and the lack of a cush drive makes toast of soft metal sprockets.
There are a few companys who make Steel sprockets but Id always stick with Honda on the front as your guaranteed a good spline cut. I bought a cheap front when i was desperate and the freeplay in the splines was a joke (causes extra wear on the output shaft)
I was very happy with the Acerbis tank although i havnt tried the IMS tank. First thing i did was buy good 10mm steel braided fuel line, inline filter and alloy pipe fittings as the cheap junk they come with is only fit for the bin. The tank is very good quality though and took a few drops with ease.
Constantly check the kickstart and the footpeg bolts as these rattle loose very quickly and the soft alloy threads are easily damaged if you dont keep on top of this.
keep the valve clearances in good order too. Its a very simple job so no excuses
When I got mine, i pretty much stripped it down, cleaned and regreased her and applied copper slip to all non moving frame and engine bolts. Honda are very fruggle when it comes to greasing the headstop so a check and regease is in order there too.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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