i ordered a cam chain for my 2001 wr426f and was wondering if i need to replace the cam chain tensioner as well. any way to check it? it cost 60 dollars plus shipping so about 70 something so i would like to not have to replace it unless its a problem. do you guys reuse them or is that asking for trouble? also how often should i replace the cam chain on my wr426? does it need replaced every 50hrs?