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Head bearing dust seal

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andy120t:
I'm in the process of replacing head bearings.

Looking at the CMSNL parts diagram for the 550K3 the lower bearing is built up from the following:

Washer (9)
Dust seal (5)
Race (8)
Ball bearings (24)
Race (3)

(numbers in brackets are the numbers on the CMSNL diagram).

I've bought aftermarket taper bearings so am ignoring parts (8/3/24). Question is - Number 5, the dust seal, do I need this or is this also part of the "bearing". Working assumption is that as my taper bearings are sealed I will not need this.

Also, do I need the washer..? (part 9).
Cheers.

Spitfire:
Depends on the kit, some use the washer and seal others do not.

Cheers

Den

andy_c101:
hi,
I can't give a definitive answer; all I can say is that having just done my 550k3 head bearings with taper rollers from (d/silver), I did NOT fit a dust seal.
I too had the same dilema. D/silvers couldnt give me a definite statement.
I tried using the original old Honda dust seal, but it just sqwuished out of shape, and was left fouling the taper rollers, so I had to extract the bearing again (a right pain!).
So once installed, I decided to apply a generous layer of grease under the lower end of taper roller bearing assembly to keep and water spray n dust out. I figured that as a low mileage fair weather rider (whimp, I know...) the bearing should be ok.

PS: with my aftermarket (d/silver) taper roller kit, it came with a thick (3-4mm?) washer. - Don't use that washer on the 550k3, I wasnt left with enough thread for the upper bearing retainer.

PPS; My headstock is now really solid, - much better than with the original balls.

Good luck.
Andy C

Spitfire:
Probably not much help but here are the instructions from the DSS kit that I got, I also did not fit a seal and whacked in a load of grease.



Cheers

Den

Yoshi823:

--- Quote from: andy120t on April 10, 2010, 08:45:36 AM ---I'm in the process of replacing head bearings.

Looking at the CMSNL parts diagram for the 550K3 the lower bearing is built up from the following:

Washer (9)
Dust seal (5)
Race (8)
Ball bearings (24)
Race (3)

(numbers in brackets are the numbers on the CMSNL diagram).

I've bought aftermarket taper bearings so am ignoring parts (8/3/24). Question is - Number 5, the dust seal, do I need this or is this also part of the "bearing". Working assumption is that as my taper bearings are sealed I will not need this.

Also, do I need the washer..? (part 9).
Cheers.

--- End quote ---

The new taper roller bearings are not sealed in the same sense as wheel bearings are...there is a gap. But copious amounts of grease is normally the best method of sealing the bearings from the elements, although there is a very thin bearing seal that can be purchased that can go between the lower taper bearing & the lower part of the steering stem...but I havn't got this part number to hand at the moment...i'll see if I can find it & post it on here.
But as has been said, many of these bikes are low mileage per annum fun machines that are not likely to see the worst ravages of another Winter like we have just encountered, so i'd just go with lots of grease.

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