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Old 11-06-2012, 11:35 AM   #1
chay250
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Default help req renewing steering stem bearings

i have just removed the fork yokes from the headstock on my 312r as my steering was notchy - my suspicions were well founded as i have found that the bottom bearings are shot! looks like water ingress - do any of you guys have any tips on how to remove the bearing cups from the steering tube? also how do you remove the inner bearing from the bottom of the steering stem? done this job on a tz which aint so bad as you can get at the bearing cups in the headstock and drift them out - this is dosen't possible with the mv - having read the workshop manual i see no reference to what looks like a pig of a job.
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Old 11-06-2012, 12:52 PM   #2
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Take it to an engineering shop and have them pull it off the stem..Suggest you fit taper rollers too..The bearing cups can be touched with weld and will crack and then drop out easily
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Old 11-06-2012, 08:14 PM   #3
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Wink ?

removing bearing cups......
use a bent ended punch or one with a foot on the bottom or turn it upside down and heat it with a TIG torch it will just fall down

inners from the stem.....
use a bearing separator
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Old 11-06-2012, 09:17 PM   #4
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Quote:
Originally Posted by theknurl View Post
inners from the stem.....
use a bearing separator or turn it upside down and heat it with a TIG torch it will just fall down
I use a cutoff wheel on my moto-tool to cut a slot in the inner race, about 3/4 through it, ***very carefully*** not going through too far and damaging the stem. Then you can take a metal chisel, place it in the notch made by the cutoff wheel, and give it a good whack. The inner race will crack and you're done!
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Old 11-07-2012, 02:10 AM   #5
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Default +3

All three mentioned methods will work just fine, and I agree with you, go with taper bearings as a replacement.
Here's a part number if you need it, make sure you get the replacement dust covers also.
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Old 11-07-2012, 11:03 AM   #6
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thanks for that guys - first i need the tool to undo the large ring on the headstock - merc 07 is going to make one.
donsy - have i got the bearing number correct off your picture is it >> 32907-3 ? also what make is it? not sure if the number is the same for all bearing companies or if they use their own.
cheers colin
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Old 11-08-2012, 02:21 AM   #7
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Originally Posted by chay250 View Post
thanks for that guys - first i need the tool to undo the large ring on the headstock - merc 07 is going to make one.
donsy - have i got the bearing number correct off your picture is it >> 32907-3 ? also what make is it? not sure if the number is the same for all bearing companies or if they use their own.
cheers colin
Here you go Colin - 32907JR3 Narrow Section Steering Head Set Taper Roller Bearing 35x55x15mm
or
http://simplybearings.co.uk/shop/pro...ducts_id=43735
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Old 11-08-2012, 11:04 AM   #8
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star man mate - much obliged
colin
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Old 11-09-2012, 08:56 PM   #9
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Wink numbers?

Colin;
almost all bearing numbers are standardized size wise
most companies use the SKF coding system for seals too

any bearing supplier can find what you want.....

the internet is NOT the place to buy bearings.....
there is an International Bearing Manufacturers Association trying to stop counterfeit bearings....i wonder who the counterfeiters are????
its the Chinese

i get mine from Charlie.....we've been friends for 30 years......
he supplies all the off road teams, he was a trials bike importer and rider
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Old 11-09-2012, 09:10 PM   #10
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Arrow Whaat - Thanks for that

Quote:
Originally Posted by theknurl View Post
Colin;
almost all bearing numbers are standardized size wise
most companies use the SKF coding system for seals too

any bearing supplier can find what you want.....

the internet is NOT the place to buy bearings.....
there is an International Bearing Manufacturers Association trying to stop counterfeit bearings....i wonder who the counterfeiters are????
its the Chinese

i get mine from Charlie.....we've been friends for 30 years......
he supplies all the off road teams, he was a trials bike importer and rider
I have bought from these guys before Noel and they seem to be on it, plus, how bad can a steering bearing get, not much going on in there.
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