Menu
What's new
By:
Filters

Steering head bearings

RCinNC

RCinNC

Well-Known Member
Joined
Aug 30, 2014
Messages
2,875
Location
North Carolina
I have a set at home in North Carolina that I can measure for you, but I'm out of state right now. If you can wait til Friday I can get back to you on that.
 
S

Squibb

Well-Known Member
Joined
Aug 10, 2014
Messages
1,067
Location
Bedford, UK
Probably safer to just order the OE kit from your dealer, or maybe a specialist such as All Balls.

IIRC, the top & bottom taper rollers are to differing specs. If you order the Yamaha kit, I think you will find one will be an SKF 320/28x, the other will be from another bearing manufacturer, with the rollers set at a slightly different angle. Removing the old bearing from the lower stem can get interesting - use 'search' & you will pick up on various options if yours proves to be a challenge.
 
Last edited:
WJBertrand

WJBertrand

Ventura Highway
Joined
Jun 20, 2015
Messages
4,534
Location
Ventura, CA
On my bike the lower OEM race is an NTN bearing: 4T-CR-0843. The upper one is a Koyo bearing 320/29JR and the race is just labeled 320/29J.

I destroyed the lower roller bearing assembly itself removing it, but it should be the same number as the race, perhaps with an R at the end? not sure though.

I used the Yamaha OEM replacements because I was having trouble identifying generic replacements with the integral seals like these. The All-Balls kit includes separate seals and I was less confident of the fit with those as I’ve had issues on other bikes when not using the same design as OEM.


Sent from my iPhone using Tapatalk Pro
 
gv550

gv550

Well-Known Member
Joined
Sep 14, 2016
Messages
1,351
Location
Listowel, Ontario, Canada
My 2016 has two 320/28x but different manufacturers and internal features top to bottom. Mine also developed a flat spot and upon inspection only the bottom bearing was damaged so I bought it from Yamaha and left the top bearing alone, less work and less money. I have no idea why Yamaha would use different roller contact angles from top to bottom but decided to stay with their OEM parts.
 
bimota

bimota

Moderator
Staff member
Global Moderator
Joined
Dec 10, 2017
Messages
6,699
Location
bridgend, Wales, UK
can somebody give me the yamaha part numbers needed to do steering head bearings on a 2013 gen 1 please

looking at the yamaha parts list bit confusing

i,ve bought 1 of 93332-00081 and 1 of 93332-00078 are these the 2 needed and do i need while in to replace any other parts

cheers

rob
 
Last edited:
WJBertrand

WJBertrand

Ventura Highway
Joined
Jun 20, 2015
Messages
4,534
Location
Ventura, CA


The 93332-00081 is the lower one. I’m not sure what the differences are to the upper one but the ID is different between them.

These are the correct parts.
 
Last edited:
Boris

Boris

Well-Known Member
Joined
Dec 21, 2013
Messages
2,097
Location
midlands. UK
Supertee123 said:
Hi folks,
Anybody know the size of the steering head bearings for yam ten 2012.
I’m getting a slight notch,looking to get SKF
Click to expand...
I don’t know the sizes however I replaced mine in the last couple of months and used OEM parts. One set was definitely SKF and I think the other was NTN. £85 in England for the pair.
 
bimota

bimota

Moderator
Staff member
Global Moderator
Joined
Dec 10, 2017
Messages
6,699
Location
bridgend, Wales, UK
Boris said:
I don’t know the sizes however I replaced mine in the last couple of months and used OEM parts. One set was definitely SKF and I think the other was NTN. £85 in England for the pair.
Click to expand...
yep oem ones in the UK are £88 a pair from yamaha i managed to get both for £40

here is one of them them for £19.99 make a offer
www.ebay.co.uk

2002/18 YAMAHA YZ 125/YZ 250/YZF250/YZF450 - STEERING HEAD BEARING - MOTOCROSS | eBay

2002/18 YAMAHA YZ 125/YZ 250/YZF250/YZF450 - STEERING HEAD BEARING. General Information. OTHER PARTS AVAILABLE MAY FIT OTHER YEARS.
www.ebay.co.uk

rob
 
S

Squibb

Well-Known Member
Joined
Aug 10, 2014
Messages
1,067
Location
Bedford, UK
What's with that CA reproductive harm warning on the bearing boxes @WJBertrand?

Surely no one is thinking of using these bearings for anything that might be deemed inappropriate? Come to think of it though, I did see a similar warning on a vacuum cleaner a while back.
 
WJBertrand

WJBertrand

Ventura Highway
Joined
Jun 20, 2015
Messages
4,534
Location
Ventura, CA
Squibb said:
What's with that CA reproductive harm warning on the bearing boxes @WJBertrand?

Surely no one is thinking of using these bearings for anything that might be deemed inappropriate? Come to think of it though, I did see a similar warning on a vacuum cleaner a while back.
Click to expand...
There was a proposition passed years ago, (#65) I think,that requires labeling of virtually everything that might be made of or containing a nanogram of anything that anyone thinks might cause cancer or birth defects.

Virtually everything you buy, store or business you enter must be so labeled. It’s a stupid cry wolf law that basically just serves to desensitize people to the point no one pays any attention.


Sent from my iPhone using Tapatalk Pro
 
RCinNC

RCinNC

Well-Known Member
Joined
Aug 30, 2014
Messages
2,875
Location
North Carolina
Supertee, sorry for the delay in getting back to you.

I just pulled out my set of bearings for the S10. I'm not sure how to measure the tapered upper and lower bearings in a way that would give you the info you need to source an alternate bearing from SKS. If there are specific measurements you need, I'll be happy to take them. I can provide the identifying info from the races and bearings themselves; if you have that, you may be able to cross reference them to an equivalent bearing in the SKS line.

Part Number 93332-00078, which is the upper steering head bearing and race, are both made by Koyo, and bear the following identifying info:

The bearing is marked "KOYO", "HI-CAP", "320/28JR", "JAPAN"
The bearing seal is marked "KOYO", "320/28JRR9", "17"
The race is marked "KOYO", "HI-CAP", "320/28JR", "JAPAN"

Part Number 93332-00081, which is the lower steering head bearing and race, are both made by NTN, and bear the following identifying info:

The bearing is marked "NTN", "4T-CR-0643L", "JAPAN YN"
The seal is marked "NTN", "CR-0643L"
The race is marked "NTN", "4T-CR-0643", "JAPAN", "YN"

Hope this info helps.
 
Supertee123

Supertee123

Member
Joined
Aug 13, 2015
Messages
86
Location
Dublin Ireland
RCinNC said:
Supertee, sorry for the delay in getting back to you.

I just pulled out my set of bearings for the S10. I'm not sure how to measure the tapered upper and lower bearings in a way that would give you the info you need to source an alternate bearing from SKS. If there are specific measurements you need, I'll be happy to take them. I can provide the identifying info from the races and bearings themselves; if you have that, you may be able to cross reference them to an equivalent bearing in the SKS line.

Part Number 93332-00078, which is the upper steering head bearing and race, are both made by Koyo, and bear the following identifying info:

The bearing is marked "KOYO", "HI-CAP", "320/28JR", "JAPAN"
The bearing seal is marked "KOYO", "320/28JRR9", "17"
The race is marked "KOYO", "HI-CAP", "320/28JR", "JAPAN"

Part Number 93332-00081, which is the lower steering head bearing and race, are both made by NTN, and bear the following identifying info:

The bearing is marked "NTN", "4T-CR-0643L", "JAPAN YN"
The seal is marked "NTN", "CR-0643L"
The race is marked "NTN", "4T-CR-0643", "JAPAN", "YN"

Hope this info helps.
Click to expand...
Thanks
 
You must log in or register to reply here.
Top