Honda-SOHC
SOHC.co.uk Forums => CB750 => Topic started by: sprinta on April 30, 2018, 03:03:25 PM
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Can anybody advise what the smaller hole diameter is inside the fluid chamber?
Just had the M/C re-anodized and there was a bit of crud from the process in the hole. Have passed a 0.5mm drill by hand through it but wondered if I need to pass a larger drill through it?
Thanks
Andy
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Couldn't tell you. But I shouldn't think giving the drill bit a gentle wiggle would hurt.
How hard can the crud be?
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It's the Vent Port/By-Pass Port. The piston can't return correctly without it, so you do need it. It should not be enlarged. It's there to allow equilibrium.
Please have a look at have a look at
https://www.freeasestudyguides.com/brake-master-replenishing-port.html
This explains it better than I can.
Also, when you rebuild the M/C, make sure that the port is not blocked inside, by the positioning of the piston/seals.
I know this because I once thought that I was so clever that I could improve the brakes on my R90S. I was wrong - not for the first time!
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Should have said gentle wiggle to remove crud not to enlarge the hole.
Not once have I ever thought about drilling it out.
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Thanks for the replies and advice. It was because of being conscious of not enlarging the hole that I did not want to pass anything too large through it, hence try to establish it's normal dia.
Have used the 0.5mm drill, which I am sure is smaller and a syringe with some alcohol which will have hopefully cleaned the crud out.
Andy