SOHC.co.uk Forums > CB350/400
CB400/4 FRONT FORK REFURB BY JULIE
Nurse Julie:
--- Quote from: taysidedragon on December 16, 2017, 04:49:57 PM ---
--- Quote from: Nurse Julie on December 16, 2017, 04:34:27 PM ---
--- Quote from: taysidedragon on December 16, 2017, 04:29:44 PM ---I suppose it's a lesson to all of us. Never assume that the old parts were fitted correctly in the first place!
Even factory original parts can be fitted wrongly. :-\
--- End quote ---
Yep, bloody previous owners, they have a lot to answer for at times !!!
And I thought I was doing so well. Never mind. I wonder if that's why the forks got stuck down sometimes ?
--- End quote ---
It may be. The stantions are straight aren't they?
Your rebuild is going really well. The fork seals are just a little hiccup. Everybody has them so no big deal.
Looking forward to the rest of the bike rebuild. 8)
--- End quote ---
Yep, stantions are straight
Nurse Julie:
--- Quote from: hairygit on December 16, 2017, 04:52:48 PM ---Just DON'T try re using those seals again, get new ones, a few pounds spent now will save a lot of cursing and swearing later if they leak and you have to strip them a 3rd time!
Sent from my X6pro using Tapatalk
--- End quote ---
Yes Mr Hairy, I will use new ones.
Nurse Julie:
--- Quote from: kevski on December 16, 2017, 05:00:11 PM ---
--- Quote from: Nurse Julie on December 16, 2017, 04:34:27 PM ---
--- Quote from: taysidedragon on December 16, 2017, 04:29:44 PM ---I suppose it's a lesson to all of us. Never assume that the old parts were fitted correctly in the first place!
Even factory original parts can be fitted wrongly. :-\
--- End quote ---
Yep, bloody previous owners, they have a lot to answer for at times !!!
And I thought I was doing so well. Never mind. I wonder if that's why the forks got stuck down sometimes ?
--- End quote ---
The air in the forks was probably being pushed out through the seals, and then a vacuum was created when the forks were going back up slowing the return to normal height and momentarily sticking from time to time, i am surprised you wern't leaking oil, in the right way up the pressure build up in the cavity makes the seal expand against the stanchion creating a tighter seal keeping even the air in, you will certainly notice the difference, better to find out now rather than finding 300ml of oil over your tyres when out riding it, doesn't bear thinking about, the coiled spring sits in a lip and i have not known one to come off yet.
We are nosey buggers, but sometimes it helps.
--- End quote ---
Carry on being nosey Kevski, if it's to my benefit ;D ;D ;D. Never had an oil leak on these forks, just the sticking down at times
Nurse Julie:
Well, I was just about to take these forks apart and Trig came in. The exact words were' what the bloody hell are you doing?'
So I explained that I had put the seals in the same way I had taken them out and as a result, they are upside down. 'No they are not' he said. Anyway, I have now had a teaching session on Genuine Honda fork seals, which is what I took out and replaced them with genuine Honda ones.
This picture is showing the upper side of the seal, with the spring and the writing on the seal. The inner lip of the seal is soft and supple and the spring compresses this.
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This picture is showing the underside of the seal. The inner lip is very soft and supple. There is also a spring in the rebate which is a lot thicker and stronger than the one on the top.
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Trig says fork oil seal is always fitted with any numbers etc facing upwards or outwards.
Therefore I have fitted them correctly and do not need to strip them down again. Phew ;D ;D ;D ;D ;D
Clem2112:
Usually find the need to remove old fork seals etc by employing the two woodscrew and pull method..... assisted by added heat from warming the legs with hot water. So the closed side of these is uppermost....usually has the makers name and part number on this side too !
The stiction could have been from these being assembled the wrong way up?
Many like to polish the aalyy bits...I gave the fork legs the "original" brushed finish using emery to remove the corrosion and dinks then different grades of scotchbrite to get the finish.... then a coat or three of clear lacquer to protect them.
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