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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: dfx on February 01, 2015, 12:59:50 PM

Title: Engine noise
Post by: dfx on February 01, 2015, 12:59:50 PM

;Hi folks, I wondered if anyone has anything on diagnosing engine noises. Mine is a kind of growling at very low revs (under 1000) when the alternator light starts to come on. I was wondering if it was big ends or the cam chain. The bike has done at least 120k km

Title: Re: Engine noise
Post by: The Mighty Gryphon on February 01, 2015, 01:20:44 PM

Alternator bearings?  I had a similar problem with my K75RT.  Just a little roughness when the rotor was spun. 

Title: Re: Engine noise
Post by: Kyle10 on February 03, 2015, 02:52:33 PM

Mine had the same issue, if you mean a rattle/growl at low revs which disappears at higher revs.


The problem was with the backlash eliminator spring on the output shaft. I'm not sure that's the proper name for it, but its function is to ensure quiet engagement b. the gears. The part is cheap and it's a snap to install. It's just getting to the cursed thing, followed by the ordeal of reassembly. Replace the rubber dogs while you're in there, too.


If this is indeed the problem w/your bike and you take this route you'll be floored by the quietness/smoothness that results.