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You red line this bike don't you? The first thing to start going on a cam is the bearings. Change bearings and run the bike for about 30 hours at 1000rpm and let it break in, then change the oil and hit it hard. It will last longer.Might want to look in the crankcase too and see if there is metal shavings there too. You may need to change the rod bearings. But either way you are on the curve of burning up your engine.
Yes, the crank-arm could be replaced.
1.You would need to remove the flat nut holding the crank to the frame. And then take out the bearing.
2. A special open-ended wrench is required to remove this nut. Please visit your local bicycle shop for a new crank-arm, and the required tools, also.
3. Put in new crank-arm and its bearing.
4. Grease the bearing.
5. Tighten nut.
6. Give it a test ride.
They ought to. Bicycle components are quite universal. You may run into a part or two which won't fit (front derailleurs have to fit frame design [especially on full-suspension bikes] as well as tube diameter), and you must bear in mind that the geometry of the new frame will most assuredly be different, so your handlebars and stem may no longer be familiar or comfortable to you. Good luck!
im certain that model has a 3 piece crank set up. the inner crank bearing jam nut has loosened up or the bearings themselves have gone bad.first check to see if its tight, if it is then it will require a replacement set of bearing that are a pretty standard size to all bikes and can be purchased at nearly every bike shop.