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Author Topic: CB550K1 - Master cylinder rebuild - fine cleaning / polishing  (Read 130 times)

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Offline Erny

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CB550K1 - Master cylinder rebuild - fine cleaning / polishing
« on: February 10, 2019, 03:45:20 pm »
I'm preparing for the MC rebuild, MC is now after multiple ultrasonic baths, almost clean inside. But still there are some residuals inside MC - what can I use to fine clean or polish it w/o changing ID or risking mechanical damage?

Some time ago I remember advice to use steel wool 0000 for caliper, can I use it too? If so, just dry or with some oil?
CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline rosewood

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Re: CB550K1 - Master cylinder rebuild - fine cleaning / polishing
« Reply #1 on: February 10, 2019, 04:21:54 pm »
hackaweek on youtube does a great video of using some wet dry paper with oil spun in the cylinder with a hand drill to give a clean up/hone...worth a watch

Offline BenelliSEI

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Re: CB550K1 - Master cylinder rebuild - fine cleaning / polishing
« Reply #2 on: February 10, 2019, 07:29:34 pm »
I tape some very fine steel wool to a small (long) drill bit and let the rest wind around. Trim to fit..... Insert carefully and spray in penetrating oil. Spin, moving in and out for 30 seconds. Amazing finish!

Offline sixthwisconsin

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Re: CB550K1 - Master cylinder rebuild - fine cleaning / polishing
« Reply #3 on: February 10, 2019, 08:10:52 pm »
You know, I don't know why I have this adversity to rebuilding old Honda MC's. I have tried and they still perform sucky. I'm sure its just me but I have replaced every bike I own with a new MC. Don't know what I'm doing wrong but the replacement modern ones rock.
1974 cb550k0 with 1978 motor resto-mod
https://lensdump.com/a/neo550.A9iak
1974 cb550k0 Custom
1975 cb750f0 Custom Cafe
https://i.lensdump.com/i/AuvbxP.jpg
http://forums.sohc4.net/index.php?topic=101126.msg1134620#msg1134620
2009 Kawasaki Concours 14 (Sold)

Offline Erny

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Re: CB550K1 - Master cylinder rebuild - fine cleaning / polishing
« Reply #4 on: February 10, 2019, 10:52:06 pm »
You know, I don't know why I have this adversity to rebuilding old Honda MC's. I have tried and they still perform sucky. I'm sure its just me but I have replaced every bike I own with a new MC. Don't know what I'm doing wrong but the replacement modern ones rock.
Well, was thinking the same, still an option. Can you recommend the new one that is better quality than stock Honda and looks the same? I want to keep stock look. And idelly also stock lever
CB750K K7 USA model (1977)
CB550K1 USA model (1975)

Offline sixthwisconsin

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Re: CB550K1 - Master cylinder rebuild - fine cleaning / polishing
« Reply #5 on: February 11, 2019, 05:24:41 am »
4into1 has them. Ive used several now and there pretty nice. I have a brand new 15.8 unused. If you interested, p.m. me.

https://4into1.com/brakes/
1974 cb550k0 with 1978 motor resto-mod
https://lensdump.com/a/neo550.A9iak
1974 cb550k0 Custom
1975 cb750f0 Custom Cafe
https://i.lensdump.com/i/AuvbxP.jpg
http://forums.sohc4.net/index.php?topic=101126.msg1134620#msg1134620
2009 Kawasaki Concours 14 (Sold)

 

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