Maintenance & Technical > KX500 Original

Crankcase/gearbox bearings

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sandblaster:
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

dave916:
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

karlosthejackel:
Has anyone ever had issues with running non OEM crank bearings? I was going to use koyo or SKF

sandblaster:

--- 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

--- End quote ---

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.

Foxx4Beaver:

--- 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

--- End quote ---

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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