HELP stearing head bearing

bimota · Nov 27, 2020

Hi guys,

if you need to change stearing head bearing because its notchy fails A UK mot safety test example

looking at the yamaha parts list parts wise do you only need to by 1 off 93332-00078 PARTS WISE FOR THIS JOB , or while your in there do you advice any other parts

cheers

rob

~TABASCO~ · Nov 27, 2020

It’s easy to change out. I would suggest the factory Japan bearings myself. If your changing them out you won’t need to check. For anyone else lubing the bearings check the lower race for a crack. I’ve seen a few of those.
Also when re installing make sure to clean the top steer tube threads completely of grease and then add blue lock tight to the threads before torquing. I believe that is 92-94Lbs. I would need to double check.

gv550 · Nov 27, 2020

You should change the top bearing while you are in there, which is the one you have the part number for. But, it will definitely be the bottom bearing that is notched and possibly cracked. It is 93332-00081-00 on the front fork page. The top bearing will probably be ok to reuse, but most mechanics will want to change both.

bimota · Nov 27, 2020

gv550 said:
You should change the top bearing while you are in there, which is the one you have the part number for. But, it will definitely be the bottom bearing that is notched and possibly cracked. It is 93332-00081-00 on the front fork page. The top bearing will probably be ok to reuse, but most mechanics will want to change both.

ok,
thanks gary its the bottom one then mostly but do both thanks mate

rob

gunslinger_006 · Nov 27, 2020

This is NOT a bash on the uk, but i am really glad we dont have this level of invasive inspection here in the us. Jesus.

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thughes317 · Nov 27, 2020

gunslinger_006 said:
This is NOT a bash on the uk, but i am really glad we dont have this level of invasive inspection here in the us. Jesus.

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NY state safety inspection includes checking the steering for binding or slop (usually checked by simply just grabbing the front brake and rocking the bike back-and-forth), I'd be willing to wager that several other states do too.

Cantab · Nov 27, 2020

gunslinger_006 said:
This is NOT a bash on the uk, but i am really glad we dont have this level of invasive inspection here in the us. Jesus.

Sent from my iPhone using Tapatalk

I get ya gunners,

We also have yearly WOFs (warrant of fitness) checks down here (altho a couple of exceptions https://www.nzta.govt.nz/vehicles/warrants-and-certificates/warrant-of-fitness/), its a good way to keep the shyte off the roads i reckon and it can pick up faults that maybe you wern't aware of.

When i visited the states a few years back i couldn't believe some of the shyte rust buckets , balding tyres and cracked windowed (even police) cars on the road, vehicles need to
be roadworthy and safe for everyone's sake.

Im sure most people round here are good on their maintenance

gunslinger_006 · Nov 27, 2020

thughes317 said:
NY state safety inspection includes checking the steering for binding or slop (usually checked by simply just grabbing the front brake and rocking the bike back-and-forth), I'd be willing to wager that several other states do too.

That is interesting. I have not lived in an area where this is required. Seattle for example.

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Squibb · Nov 28, 2020

I've always used M&P at Swansea in the past, admittedly not for my 10 as yet.

They do a complete bearing kit ............. https://www.mandp.co.uk/products/22-1001-steering-bearing-seal-kit-596947

bimota · Nov 28, 2020

Squibb said:
I've always used M&P at Swansea in the past, admittedly not for my 10 as yet.

They do a complete bearing kit ............. https://www.mandp.co.uk/products/22-1001-steering-bearing-seal-kit-596947

funny enough,

the 2 yamaha bearings come to £83

on ebay got a 93332-00078 for £17
a 93332-00081 for £20

so not bad £37 instead of £83

rob

fac191 · Nov 28, 2020

bimota said:
funny enough,

the 2 yamaha bearings come to £83

on ebay got a 93332-00078 for £17
a 93332-00081 for £20

so not bad £37 instead of £83

rob

Is that price with the powder coating Rob ?

bimota · Nov 28, 2020

fac191 said:
Is that price with the powder coating Rob ?

no,
i was told its not worth powder coating stearing head bearings they go inside some tube thingy and nobody will see them

so on that advice i,m leaving it

fac191 · Nov 28, 2020

Will let you off then

WJBertrand · Nov 28, 2020

California used to have surprise pop up vehicle inspections. A study of the data showed that except for tires, equipment failures accounted for so few accidents the program was deemed of no safety benefit and discontinued. It was also extremely unpopular with the public. I was once issued a fix it ticket for excessive noise for a motorcycle with a completely stock exhaust. I rode straight from the inspection to the closest CHP office and had it immediately signed off. Complete waste of everyone’s time.

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fac191 · Nov 28, 2020

Who sorted you out, Baker or Ponch ?

bimota · Jan 6, 2021

can i ask you guys that have needed to change stearing head bearings what sort of mileage you getting out of the oem bearings,

i ask as a guy is changing his at the mo on facebook at 75000 kilometers and he got the front off doing fork seals as well,

now my bikes only done 26000 miles, and at the uk mot test the test said he could feel a very slight notch i couldn,t mind

rob

MIKE R · Jan 6, 2021

When I took my bike in for it's 18k service back in May 2017 I was also told that the head bearings might need replacing.

28k and 4 more services later they are still going strong and have not been mentioned again at service or MOT time

Mike

bimota · Jan 6, 2021

MIKE R said:
When I took my bike in for it's 18k service back in May 2017 I was also told that the head bearings might need replacing.

28k and 4 more services later they are still going strong and have not been mentioned again at service or MOT time

Mike

cheers mike,

thats exactly what i was expecting some body to say, i had the mot done buy a good mate last month had the bike up on centre stand he moved the forks side by side said he could feel a tiny notch he said come here i did the same nothing lol cheers mate

rob

RCinNC · Jan 6, 2021

In April 2020 I serviced my steering head (along with the forks, spark plugs, air filter and throttle bodies). At that time the bike had 66,893 miles (107,654 kilometers). The upper and lower races and bearings were still fine. I repacked them with Belray waterproof grease and continued to march. I had actually bought new races and bearings in anticipation of changing them, but decided against it.

For those that haven't changed theirs yet, if you're inspecting the lower bearing race and you see two small notches on the top outer surface of the race, I believe they're supposed to be there. When I inspected mine I saw these notches and thought "damn, there are little cracks in the race", but when I looked at my brand new OEM lower race, the notches were in that too. Keep it in mind when you're checking yours.

About the only way I could imagine a set of headset bearings/races going bad in 26,000 miles would be if the headset hadn't been adjusted properly and there was a lot of slop in the bearings. And you probably would have noticed that before you hit those many miles in the way the bike handled.

bimota · Jan 6, 2021

RCinNC said:
In April 2020 I serviced my steering head (along with the forks, spark plugs, air filter and throttle bodies). At that time the bike had 66,893 miles (107,654 kilometers). The upper and lower races and bearings were still fine. I repacked them with Belray waterproof grease and continued to march. I had actually bought new races and bearings in anticipation of changing them, but decided against it.

For those that haven't changed theirs yet, if you're inspecting the lower bearing race and you see two small notches on the top outer surface of the race, I believe they're supposed to be there. When I inspected mine I saw these notches and thought "damn, there are little cracks in the race", but when I looked at my brand new OEM lower race, the notches were in that too. Keep it in mind when you're checking yours.

About the only way I could imagine a set of headset bearings/races going bad in 26,000 miles would be if the headset hadn't been adjusted properly and there was a lot of slop in the bearings. And you probably would have noticed that before you hit those many miles in the way the bike handled.

thanks,

bikes been fine with no issues in all of the 26000 miles i,ve done

rob

HELP stearing head bearing

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