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2005 BF 750 Engine Noise (rattle??)

cadams2010-08-26 18:26:56 +0000 #1
I have what I will call a rattle coming from the left side of the engine. I thought it was a loose heat sheild but they are tight. It not a knock as some describe. It happens only during a certain RPM range, and not all the time. After thinking about it it may sound like loose chains in the engine. I pulled the tensioner spring out and reset the setting. I went for a short drive down the street and it seems to have gone away. Anyone had this problem? Do the springs in the tensioners fatigue?
Roboquad2010-08-26 18:42:02 +0000 #2
check the 4small cam bolts for stripping out they keep the cap on over the cam & chain. if the tensioner was out of wack you could have been experiencing the cam jumping up and down on the opposite end of the sprocket. Your cam sits in the aluminum sleeve with no bearings these things wear and if the chain was too tight it will lift that end up causing a rattle or clacking. good luck.
cadams2010-08-26 19:08:20 +0000 #3
I pulled the tensioner and reset it. The noise seemed to go away after a short ride, but it is back. You mentioned pulling the cover? Can you describe where the cover is? Can these tensioners fatigue over time? I ordered one hoping that it is.
cadams2010-08-26 18:35:51 +0000 #4
Sorry, I meant the cam bolts not the cover...

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