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TECHNICAL MOTOBRICK WRENCHING In Remembrance of Inge K. => The Motobrick Workshop => Topic started by: woodgeek on February 07, 2018, 02:35:15 PM

Title: master cylinder flex hone
Post by: woodgeek on February 07, 2018, 02:35:15 PM
Has anyone used a flex hone on their master cylinders before?
Title: Re: master cylinder flex hone
Post by: rbm on February 07, 2018, 05:49:46 PM
All K-bikes have Nikasil coated cylinders.  They last nearly forever and don't ever require a hone.
Title: Re: master cylinder flex hone
Post by: woodgeek on February 07, 2018, 06:07:19 PM
All K-bikes have Nikasil coated cylinders.  They last nearly forever and don't ever require a hone.
Thanks for the tip.

My question was regarding the front and rear master cylinders. Mine have some pitting. I’d like to hone them rather than purchase new ones.
Title: Re: master cylinder flex hone
Post by: rbm on February 07, 2018, 06:13:21 PM
Sorry, I saw the cylinders in the subject and thought engine, not brakes.  I didn't clue in on the "master" part.
Title: Re: master cylinder flex hone
Post by: lmiklosy on February 08, 2018, 12:23:07 AM
The bores are very small for a hone (12/13mm), but I've had success with rolled-up wet or dry sandpaper and solvent or soap water.  No power tools, work by hand slowly and inspect often till the glaze is gone. 
Hope that helps.  :clap:
Title: Re: master cylinder flex hone
Post by: Martin on February 08, 2018, 02:57:39 AM
Wet and dry slipped into a slotted dowel to make a flap wheel. However I wouldn't bother doing it on the rear master cylinder, a new rear can be bought for $1.33 Au. See http://www.motobrick.com/index.php/topic,9364.msg90596.html#msg90596 Once done you will never have to hone a rear master cylinder again. The price of non OEM cups comes to $10.00 for the extra $3.33 I now have a spare in stock not that I've ever needed it.
Regards Martin.