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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: REGerlach on September 04, 2019, 02:26:52 PM

Title: '95 K75RT vibration/noise below 2500 rpm
Post by: REGerlach on September 04, 2019, 02:26:52 PM

There is a low frequency vibration that occurs upon take off and always disappears at 2500 rpm.
Any comments or suggestions?

Title: Re: '95 K75RT vibration/noise below 2500 rpm
Post by: The Mighty Gryphon on September 04, 2019, 03:54:20 PM

I'm guessing the sloppy fit between the output shaft and the balance shaft.  Rattles and clanks between 1500 and 2000rpm on my K75RT.

Title: Re: '95 K75RT vibration/noise below 2500 rpm
Post by: REGerlach on September 06, 2019, 10:04:11 AM

Thank you very much!
Thought it might be the resonant frequency of the Fairing.   Guess not.

Title: Re: '95 K75RT vibration/noise below 2500 rpm
Post by: beemuker on September 06, 2019, 10:35:58 AM

Quote from: REGerlach on September 04, 2019, 02:26:52 PM

There is a low frequency vibration that occurs upon take off and always disappears at 2500 rpm.
Any comments or suggestions?

My 75s does it too. These engines don't seem to enjoy low RPM's