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Author Topic: Crankcase/gearbox bearings  (Read 5718 times)

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Offline karlosthejackel

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Crankcase/gearbox bearings
« on: February 11, 2015, 04:56:39 PM »
Does anyone have a list of manufacturer part numbers for the bearings in the cases/gearbox /water pump etc etc? my cases are off being repaired and I want to get a headstart for when they return! I know the main bearing part numbers only and the Kawasaki fische only lists kawa numbers. Also what brand of bearing would you recommend? SKF? TOYO?

Cheers Karl
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Offline sandblaster

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Re: Crankcase/gearbox bearings
« Reply #1 on: February 11, 2015, 05:13:34 PM »
What year is your kx500?
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline karlosthejackel

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Re: Crankcase/gearbox bearings
« Reply #2 on: February 11, 2015, 05:43:17 PM »
Oh sorry its a 92!
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Offline sandblaster

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Re: Crankcase/gearbox bearings
« Reply #3 on: February 11, 2015, 06:11:28 PM »
Quote from Motorrad:

Main bearings.
(NSK) 6306 ( Not sure what OEM rating is, but I run C3 rated) X2

KIPS bearings
(NSK) 608 (Stock is a C2 rating, I run C3) X2

Water Pump
(NSK) 608 (Stock is a C2 rating, I run C3) X2

Clutch Pressure plate
(NSK) 6001 (Stock is a C2, I run C3) X1

Shift Drum bearing
(NSK) 6905 (stock is a C2 I run a C3) X1

Transmission LEFT CASE

(NSK) 6305 (I run a C3, OEM is C2) (replaces OEM part number 92045-1011) X1

(OEM) This is the bearing My bearing house cant get.. so OEM it is 92045-0013 X1

Transmission RIGHT CASE

(NTN) 63/22 (I run a C3, OEM is C2) (Replaces OEM part number 92045-1134) X1
(special note on this bearing... ALOT of the ones out there now have a Plastic cage... Request a metal one, and CHECK IT before you leave
I Just dont trust plastic cages in transmissions....)

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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline karlosthejackel

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Re: Crankcase/gearbox bearings
« Reply #4 on: February 11, 2015, 06:25:59 PM »
Thank you so much! Im guessing that was somewhere on this site? I did try a few searches before asking the question!
How come most of those bearings were c3 rather than c2? Is a c3 tighter or looser tolerance?
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Offline sandblaster

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Re: Crankcase/gearbox bearings
« Reply #5 on: February 11, 2015, 06:39:26 PM »
Yep... it's on this site and others..
C2 Clearance fit on both inner and outer ring. Low to no axial loading. No preload. Low speeds. Little tolerance for play. Low temperature.
C3 Very low torque. High loads. Heavy interference fits. High temperature. Preloaded.
We are talking radial clearance.

C2 tighter
C3 looser

Radial clearance is classified on a C1, C2, CN, C3, C4 and C5 scale, with clearance increasing toward the highest number, which is C5. When noise or vibration is an issue, internal clearance is reduced, typically to the C1 or C2 range depending on the application. Larger clearance classes of C4 or C5 are used in applications requiring a heavy interference fit or experience high operating temperatures.

Internet... copy and paste...  :-o
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline dave916

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Re: Crankcase/gearbox bearings
« Reply #6 on: February 13, 2015, 07:05:37 AM »
Most people seem to disagree with me on this one :-o
USE OEM BEARINGS on crank  / I am currently trying to go a  cheaper route than oem



The shift drum bearing i would just stick a 6905 as it hardly turns
I Think kawasaki stuck a plastic cage in 63/22  bearing for a reason , either way metal or plastic cage it does not make that much of a differance,{never seen a one fail}
The one i have got from beariing house have metal cages








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Offline karlosthejackel

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Re: Crankcase/gearbox bearings
« Reply #7 on: February 14, 2015, 11:37:18 PM »
Has anyone ever had issues with running non OEM crank bearings? I was going to use koyo or SKF
« Last Edit: February 15, 2015, 09:52:50 PM by karlosthejackel »
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Offline sandblaster

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Re: Crankcase/gearbox bearings
« Reply #8 on: February 15, 2015, 05:47:32 AM »
Quote from: karlosthejackel on February 14, 2015, 11:37:18 PM
Has anyone ever had issues with running non OEM crank bearings? I was going to use Toyo or SKF

Either are quality bearings and should give no troubles.
It's when you start venturing into off brand, Chinese, or some eastern European countries, made bearings that you start having issues.

Even the Chinese manufactures admit that their whole rating system stinks:
http://www.tengenbearing.com/introduction.asp?id=68
Quoted in part:
Chinese bearings market is significantly disorder in its' prices, quality definition and even bearing designations, it seems impossible to have a standard for Chinese bearings.  For example, 6310 deep groove ball bearings in Chinese market has its' possible prices ranging from RMB12 to RMB21, which is an extremely big range for a standard product.

What this means is China is not bound by our rating system and can put whatever label they want on their bearings... Scary... I avoid them at all cost.

I noticed that Hot Rods is selling transmission bearing kits.
After I contacted a few vendors I found that those bearing sets are manufactured in China.
I won't buy them or use them in our customers bikes.
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The four stroke engine: That's one stroke for producing power and three for wearing the engine out.

Offline Foxx4Beaver

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Re: Crankcase/gearbox bearings
« Reply #9 on: February 15, 2015, 05:52:08 AM »
Quote from: karlosthejackel on February 14, 2015, 11:37:18 PM
Has anyone ever had issues with running non OEM crank bearings? I was going to use Toyo or SKF

I've had my local bearing shop next door to me make some up to OEM specs on occasion over the past 25-ish years...never had any issues.
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Offline LukeG

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Re: Crankcase/gearbox bearings
« Reply #10 on: February 15, 2015, 09:11:15 AM »
You should see the hot rods bearing out of my DRZ, it only had 34 hours on it. I avoid them now at all costs.
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Offline dave916

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Re: Crankcase/gearbox bearings
« Reply #11 on: February 15, 2015, 10:00:33 AM »
Quote from: karlosthejackel on February 14, 2015, 11:37:18 PM
Has anyone ever had issues with running non OEM crank bearings? I was going to use Toyo or SKF

I would be guessing 99% of all mx rebuilt motors are now running NON OEM crank bearings SKF  NSK, FAG, All Ball KITS  etc,
Will u have issues?
OEM 6306 can last over 60000 +miles [about 2000hrs}on big singles
IF your bearing shop 6306 last 8000miles 300hrs would u call that a issue? 
other issues using non oem bearing is they run hotter , more likely to spin wear on crank {worn crank journals are a common problem on the kx
Oem crank bearings are 4 times the price for a reason [it not for the kawasaki sticker :-)




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