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DT125R Forum -> CRANKS -> Crank bearings. Special bearings..
Post Info TOPIC: Crank bearings. Special bearings..
NorDt


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Crank bearings. Special bearings..
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Was gonna assemble my engine today, Had got some c4 bearings that was supposed to be the absolute best for 2 strokes. 6305 or something was the number on the old and stock bearings. got some 6305 bearings from SFK. i asked my dad " have you meassured that their the same ? " and he was just " pfft. Their the same " and we put them into the engine. And we noticed there was a glip. like it was too far out. So we meassured the old one, wich was 16mm and then the new ones, they where 17mm... 

 

The engine is made so that the bearings can go 1mm outside of its housing. and the housing is 15mm deep. So the bearing has to be 16mm.. did some googling now and found out the bearings are special made for the yamaha dt. 

 

but i think the stock bearing is better than the ones we got anyways. When we beat them out of the engine again, They got bad and was rattling bad when spinning them around with my finger. One of the old bearings was still good after doing 40 000 km and getting beaten out of the engine with a hammer on the inner ring xD

 

Found a English mc shop on the web that sells dt parts. was 48 pounds for the bearings with shipping to norway.

 

gonna go to my local shop tomorrow to see how much they will take for it



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mr karnage


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went to my local motorbike shop

i asked them if they had any crank bearings and he goes he'll have to order them but they asked 25.00 each

he started talking about them being special bearings and i asked him if they are 1mm shorter in width but he said no they have a **** off radius on the edge so you cant use standard 6305 bearings or normally radiused bearings.

he drew pictures and everything, im a bit blagged because everyone on here says theyre just 16mm

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NEV


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If someone could let me know the O/D, I/D and the proper depth they should be, I'll ring a mate up in Derby, works for a bearing company.

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NorDt


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Their supposed to be 25x62x16. what do you mean about a **** off radius ?

Its an all normal bearing, but the sfk didt have any in that dimention, they only had 25x62x17.



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NEV


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I reckon he means "a rather large bevelled edge Nordt" lol

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NorDt


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Lol. Didnt notice any edge on the bearing xD

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mr karnage


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yh man, the edge of the bearings more round than standard bearings

thats what the man in the shop said, drew me a picture an all

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NorDt


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okay, i thought you ment something else. But i checked yesterday and thats right.



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NORFE


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most yam and suzi use the thinner mains

iv always just got normal ones and sanded them down with a sanding disc on a small grinder works fine get the 2rs sealed ones and it keeps all the bits out while your doing it, just remember to pop the seals out 1st b4 building ha

done it on all the ones iv ever had and never had any problems

smile



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coastie123


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Hi

I know this has been brought up before but can someone give me the part numbers for these bearings??

My local bike shop has looked on his microfiche and epc for my year of bike and he reckons they are the same size!!!



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NORFE


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they are the same all years 6205's specials there 16 mm wide not 17 like normal ones

http://www.ebay.co.uk/itm/DT125R-Crank-bearings-Seals-DTR125-Crankshaft-seals-Koyo-bearings-DTR-125-/350522897350?pt=UK_Motorcycle_Parts&hash=item519ccaf3c6#ht_499wt_922

cheepert here

http://www.pjme.co.uk/acatalog/Yamaha_DT125R_Engine_Parts_Bott.html

may as well get seal kit from them aswell for that price mate



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coastie123


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Cheers Norfe... His 6305 16mm ones are £11+vat each...

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coastie123


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Oh and seal kit im getting from yambits as they're the cheapest for the complete set!!

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NORFE


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good to no whos he then????smile



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coastie123


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Local bike shop to me(20 mins away) he stocks the 6305... You put 6205 in your post.. I've checked on wemoto and they are both 6305, I was told by a neighbour that the bearings are a different size but everywhere I look they are the same ones!!!

Yambits are 22.95 (I think) for the seals but that also includes the water pump and oil seals aswell!!

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NORFE


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ahh oik nice to no some where cheap...r they koyos or other brand do u no...yeah a ment 6305's ha



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coastie123


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Definately koyo bearings, I couldn't believe it as every where else are about £35-£40!!!

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NORFE


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i no mate

last 2 places i went to swore blind they were the right ones for about the same price, rocked up at there shops and they were 17 mm ha i sed i told u derr

ended up geting them and sanding em down ha



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coastie123


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I'm off there tomorrow so will definately check the sises and report back!!

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coastie123


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Right... Your right with the code 6305 BUT....

The correct bearing number is 6305R1

6305 is 25x62x17
6305r1 is 25x62x16

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NORFE


DTR Trusted Engine Builder

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YEAH THATS IT

was there a price difference then



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coastie123


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Yep definately!!!

Standard 17 £11+VAT in stock
Special 16 £20+VAT!! Order in

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NORFE


DTR Trusted Engine Builder

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thort so ha typical init 



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coastie123


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I've just ordered my R1's from yambits website..

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NORFE


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how much were they a set then



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coastie123


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Here's a copy of the order from yambits..

1 x DT125R Engine Oil Seal Kit (OSK020) = £22.95 (Inc. VAT)
£19.13 (Ex. VAT)
1 x DT125R Full Gasket Set (GSF025) = £11.95 (Inc. VAT)
£9.96 (Ex. VAT)
1 x DT125R Crank Bearing Kit Koyo (CRB023) = £39.95 (Inc. VAT)
£33.29 (Ex. VAT)
------------------------------------------------------
Sub-Total: £74.85
Zone Rates (Shipping to GB : 0.67 Kg(s)): £3.10
INCLUSIVE OF VAT @ 20% IF APPLICABLE: £12.48
Total: £77.95

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coastie123


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Another bearing that may be needed is the output shaft bearing correct me if I'm wrong but the code is koyo 6304

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NORFE


DTR Trusted Engine Builder

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yeah thats just a std bearing that mate £3 ebay smile



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