Honda-SOHC

SOHC.co.uk Forums => CB750 => Topic started by: royhall on August 15, 2014, 05:37:55 PM

Title: Taper head race bearings.
Post by: royhall on August 15, 2014, 05:37:55 PM: Hi. Bit of advice required if somebody could oblige. Am about to change the head race bearings on my 750F2 for taper bearings. Have bought a set that has the two races (fairly obvious which is top and bottom due to the different sizes). My kit also came with a large steel washer. Does anybody know where this washer goes. I assume it's there to build up the stack height to match the original ball races. My guess is that it goes underneath the bottom race on the yokes, but it is only a guess. Help Ta.
Title: Re: Taper head race bearings.
Post by: hairygit on August 15, 2014, 06:45:41 PM: I wouldn't swear to it being correct, but I fitted mine to the top of the upper bearing, where the adjusting nut contacts it, mine came with no instructions, but 15 years later still works fine. ;D
Title: Re: Taper head race bearings.
Post by: ka-ja on August 15, 2014, 07:09:30 PM: Hi,
don't know about the 750's, but it goes on the bottom of the yoke stem on the 400/4, it stops the bottom yoke "catching" the frame bottom bearing housing area.---ken
Title: Re: Taper head race bearings.
Post by: Trigger on August 15, 2014, 08:32:52 PM: It is known as a steering washer and it goes on the bottom of the stem. Then it is the rubber dust seal and so on.
Title: Re: Taper head race bearings.
Post by: Bitsa (Ralph Wright - RIP) on August 15, 2014, 09:12:01 PM: Trig
The frame I have got has which I can not believe has all the races removed.In your opinion do I go for tapers or the bog standard?I have no problems with the standard stuff only asking because never fitted the later.
Cheers
Bitsa
Title: Re: Taper head race bearings.
Post by: Trigger on August 15, 2014, 09:23:27 PM: Bitsa, your choice, your bike. If standard bearings are fitted and the cups are OK, i just fit another set of ball bearings. But, in this case i would go for a taper set.
Title: Re: Taper head race bearings.
Post by: Bitsa (Ralph Wright - RIP) on August 15, 2014, 09:24:20 PM: Cheers Mate
Bitsa
Title: Re: Taper head race bearings.
Post by: royhall on August 15, 2014, 10:25:15 PM: Thanks for that info Trigger. Is it absolutely essential to fit the dust seals with taper rollers as I don't have any, and non were supplied with the kit. Cheers.
Title: Re: Taper head race bearings.
Post by: Trigger on August 15, 2014, 10:35:53 PM: Not all kits come with the dust seal. It is just fitted to stop road dirt and water going into the lower roller. If you pop along to your plumbing shop with the washer and ask if they have a rubber washer around that size. I think the last one i got was a little bigger, so just trimmed it to size. But, not essential.
Title: Re: Taper head race bearings.
Post by: Norniron on August 16, 2014, 12:11:11 AM: Quote from: trigger6969 on August 15, 2014, 09:23:27 PM
Bitsa, your choice, your bike. If standard bearings are fitted and the cups are OK, i just fit another set of ball bearings. But, in this case i would go for a taper set.
Hmm is that so,i can remember me changing mine to tapered bearings and a certain purist somebody ribbed me for it.
Title: Re: Taper head race bearings.
Post by: RGP750 on August 16, 2014, 08:01:42 AM: I fitted these earlier this year, Great quality,with instructions and dust seal.

http://www.ebay.co.uk/itm/Honda-CB-750-1969-1978-Steering-Head-Bearings-/191183408133?pt=UK_Motorcycle_Parts_13&hash=item2c836b4c05

Rich
Title: Re: Taper head race bearings.
Post by: Trigger on August 16, 2014, 11:57:08 AM: Norniron, there was nothing wrong with your cups on the old ones. Boy racers have to have boy racer bearings ;)
Title: Re: Taper head race bearings.
Post by: RGP750 on August 16, 2014, 01:27:52 PM: I'm a bit old to be a boy racer, only ever touched 90 once on a bike
the road looks too hard at that speed ;D
Title: Re: Taper head race bearings.
Post by: Trigger on August 16, 2014, 05:52:08 PM: When i was on about boy racer i mean boy cafe racer. 90 mph? I had a hayabusa with a nice Turbo fitted, at 210 the sweeping curves on the dual carriageway get a little tight :) Sold it before i pushed it too far.
Title: Re: Taper head race bearings.
Post by: RGP750 on August 16, 2014, 07:41:56 PM: 210 bloody hell my backside wouldn't cope with that. :o
Title: Re: Taper head race bearings.
Post by: Bitsa (Ralph Wright - RIP) on August 16, 2014, 07:46:56 PM: TRIG
knew it and never meet you mad git
Bitsa
Title: Re: Taper head race bearings.
Post by: Trigger on August 16, 2014, 08:04:25 PM: I will keep quite on my top speed then ;) It was a bit over 210
Title: Re: Taper head race bearings.
Post by: royhall on September 14, 2014, 03:50:15 PM: Just got some seals for the taper bearings. They are not what I expected really and now I am not too sure where they go. The seal is like a U shape that looks like the spacer washer goes inside it. It that correct? If it is correct, that would mean the front end of the bike is supported on the rubber seal, or am i missing something. Cheers.
Title: Re: Taper head race bearings.
Post by: Trigger on September 14, 2014, 04:36:31 PM: This seal is only a dust seal. You put the big washer on the stem first than the dust seal. The front end is supported by the bearings not the dust seal.
Title: Re: Taper head race bearings.
Post by: royhall on September 14, 2014, 04:55:28 PM: Thanks for the reply Trigger. Will give that a go. Was just concerned that this rubber seal will be trapped between the spacer and the bearing, making setting the bearing play a bit hit and miss. What I was expecting to receive was the older type seal with the steel inner like the ones supplied in the Allballs kit. Never mind will give it a go. Cheers.
Title: Re: Taper head race bearings.
Post by: Trigger on September 14, 2014, 05:20:51 PM: I have seen them the other way round as well, with the seal on first then the washer. As you tighten it up the seal wraps round the washer but, the seal needs to be a bigger OD dia than the washer for that to happen.
Title: Re: Taper head race bearings.
Post by: Ian DB on September 14, 2014, 05:51:37 PM: This might help, Installation instructions from Allballsracing.com

http://www.allballsracing.com/media/installation/22-1011_washers.pdf
Title: Re: Taper head race bearings.
Post by: Bitsa (Ralph Wright - RIP) on September 14, 2014, 06:23:10 PM: Great
Nice name though
Cheers
Bitsa
Title: Re: Taper head race bearings.
Post by: royhall on September 15, 2014, 06:19:06 PM: Yep sure enough, put the front together and the whole weight of the bikes front is on the rubber dust seal as its trapped between the spacer washer and the bearing. That surely cant be right. Can it? Anybody know where I can get seals like the ones in the Allballs kit. Thanks.
Title: Re: Taper head race bearings.
Post by: Ian DB on September 15, 2014, 09:03:22 PM: might be worth contacting the people that RGP750 suggested?

http://www.ebay.co.uk/itm/Honda-CB-750-1969-1978-Steering-Head-Bearings-/191183408133?pt=UK_Motorcycle_Parts_13&hash=item2c836b4c05
Title: Re: Taper head race bearings.
Post by: royhall on September 16, 2014, 11:03:52 AM: Okay sorted it. If anybody requires the correct seal the DSS part number is FDCBE-371-010P (Honda part number 53214-371-010). They are Â£2.95p plus the usual unbelievable postage charge. These are the ones with the steel centre core that the bearing sits on, with the rubber outer seal bonded to it. Cheers all and thanks for all your help and suggestions.