Open the clutch cover. Pull out the bolts on the clutch pressure plate and remove it and andthe springs. Pull out the clutch plates. You'll need a clutch holding tool (you can purchase from Rocky Mountain ATV.com) or an impact wrench and something to wedge in between the inner hub and the clutch basket. You'll also need at socket that is 1 &1/16 inch in diameter. Not sure what the metric size is but this will fit though the bolt is metric. Remove the lifter pin (it pulls out) and then remove that bolt. Your clutch basket should now be free.
about 30.7
One can purchase a Honda XR400 at most places that sell bicycles or biking equipment. One can check websites like Amazon or eBay. One can also contact Honda directly.
The Honda XR series motorcycles are a range of air-cooled single-cylinder four-stroke 5 XR 250R; 6 XR 250L; 7 XR 350R; 8 XR 400R; 9 XR 500 / XR 500R; 10 XR 600R. They are much smaller in size in comparison to the other bikes in the series and the xr400 had more suspension travel and a longer wheelbase.
intake .004 exhaust .005
normally a bearing that is going bad - does the sound change with vehicle speed? Then it's a wheel bearing, or if stick shift it could be form the transmission - a bad bearing there. If wheel bearing sometimes you can hear it if turn wheel hard R or L & if so whatever way you turn wheel is the side that is bad. If this is so, & high miles replace BOTH wheel bearings