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Crankshaft bearings...
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highspeedhamish
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Joined: Jun 25, 2009
Posts: 62

PostPosted: August 21, 2009, 12:01 am    Post subject: Crankshaft bearings...

I just got the main bearing for the crank from a local shop for about 15 bux. Does anyone know where to get the other one(s) for the outer left and right?

I dont feel like paying 90 bux each. Although Ive spent 1k at Mikes XS (and more to come) I think 90 is steep.

Thanks!



Crank Main Bearing (Special Roller type) - 3 used per engine. - Located center (2)
and Left hand side of crankshaft (1). OEM# 93390-00003-00 - Made in Japan
Fits: All 1970-84 650's

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xsjohn
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Joined: Jul 30, 2006
Posts: 5857
Location: North Carolina USSA

PostPosted: August 21, 2009, 8:47 am    Post subject: Re: Crankshaft bearings...

The right side (clutch side) is the odd ball bearing the rest are the same rollers.......you said you found some at a local shop......which ones did you find.... ?

xsjohn
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highspeedhamish
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Joined: Jun 25, 2009
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PostPosted: August 21, 2009, 8:12 pm    Post subject: Re: Crankshaft bearings...

NTN (Made in Japan) makes the same bearing. Its part number is: 6306NRC3.

It includes the snap ring (locating ring) also.

There is another number on the box : 009-25805



From Mikes XS.


Crank Main Bearing - Drive end - RH (Ball Type) - B6306C3- Special. 1 Pc. used
per engine. - Made in Japan. OEM# 93306-30604-00-00 Fits: 1970-84 650's




Cheers

Smile

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xsjohn
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PostPosted: August 21, 2009, 8:39 pm    Post subject: Re: Crankshaft bearings...

Thanks........I like to change that right side main when I have the crank in my hand...will look into gettin a couple of them............... xsjohn
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Srinath
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Joined: Sep 10, 2009
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Location: Charlotte NC

PostPosted: November 25, 2009, 12:40 pm    Post subject: Re: Crankshaft bearings...

xsjohn wrote:
The right side (clutch side) is the odd ball bearing the rest are the same rollers.......you said you found some at a local shop......which ones did you find.... ?

xsjohn

You happen to have dimensions for this bearing ?
A 6306 is pretty regular, though I dont have it sitting round, I have a 6305 sitting round if I recall. Common enough.
The bearings I have noticed are hardest to get are the bearings in such drives. They are same OD and width as the regular wheel bearings, but 5-6mm smaller ID. Crazy.
They have sizes like 68/22, something like that.
Cool.
Srinath.
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Srinath
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PostPosted: December 17, 2009, 1:26 pm    Post subject: Re: Crankshaft bearings...

xsjohn wrote:
Thanks........I like to change that right side main when I have the crank in my hand...will look into gettin a couple of them............... xsjohn

Hey I've noticed that these bearings have locator holes drilled in them. I presume its extra insruance to keep the outer race from walking or spinning.
They got to have those. Right ? Do generic bearings have those holes ? Or is it something yamaha modified on the bearings.

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Srinath.
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Srinath
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PostPosted: December 19, 2009, 7:04 pm    Post subject: Re: Crankshaft bearings...

OK the center bearings are a Koyo N type - AKA ther are slide out outer race type. They have the W modification - meaning they are drilled for lubrication circulation.
Other than that, their OD is 67.8 mm or 2.67 inch.
ID is 31.6mm or 1.23 inch.
Width is 17.1mm or .66 inch.

So anyone know what its design number is. Like 6306 ... which BTW my local bike shop has a few of, its a common wheel bearing size apparently.

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Srinath.
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Srinath
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Posts: 343
Location: Charlotte NC

PostPosted: December 20, 2009, 11:00 am    Post subject: Re: Crankshaft bearings...

Manual says its a 32X68X17 bearing. I will measure it again.
Cool.
Srinath.
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Srinath
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Posts: 343
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PostPosted: December 24, 2009, 9:56 am    Post subject: Re: Crankshaft bearings...

OK I now know what john was saying. The right side bearing is a DG3078 some or other ... 30 mm ID 78 mm OD, it is rather confusing for people who measure and sell bearings ... 30 ID means its a 6306 - I made the same mistake, and mine has the number partially scuffed off ... and

Anyway its not a 6306. Its 78MM OD, 6306 is 72 OD.

Now I realise that is what John was talking about with that machine shop thread. We need a 3mm wall sleeve 72 ID, 78 OD with that locating clip in it, that can be pressed on a 6306 bearing and we can use 6306 in it.
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Srinath.
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