lower end bearing kit for 2001 klr? - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 24 Old 12-10-2014, 08:36 PM Thread Starter
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lower end bearing kit for 2001 klr?

does anyone know where i might find all the bearings needed to rebuild the lower end of my 2001?
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post #2 of 24 Old 12-11-2014, 04:34 PM
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Which bearings do you need? Connecting rod generally comes as a kit with connecting rod, bearing and crank pin. This is because the pin and inside bore of the connecting rod are bearing surfaces. Someone might offer the bearing only but I'd not do it alone as the pin and rod will have commensurate wear.

Main bearings: the ball bearing I have in my notes as 40x90x23 mm SKF 6308, but not certain if that's by my own measurements or someone provided. Single row ball bearing so simple enough to source.

The cylindrical roller bearing comes with the left crankshaft half if memory serves. I've not needed to source one of these separately that can recall. This bearing runs in a steel insert in the left side case so damage there requires case half replacement. Very unusual to have a crank rod bearing or left bearing fail so would make certain. The right side is a "replace if in there" precaution IMO.

Then there are the balancer bearings and suppose you might mean transmission bearings but the request doesn't specify.

More information is required.




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Originally Posted by nygee1981 View Post
does anyone know where i might find all the bearings needed to rebuild the lower end of my 2001?
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post #3 of 24 Old 12-15-2014, 01:15 PM Thread Starter
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i am looking for all bearings associated with the balancer system. so all the bearings that are associated with the upper and lower balancer weights on the left side and the right side of the motor.
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post #4 of 24 Old 12-17-2014, 12:23 AM
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Hoping Tom will weigh in because think he was smart enough to record the numbers...don't ask.... (face palm). If memory serves they are all readily available from a bearing supply house. Might be worth PM'ing him in case he hasn't seen this thread.
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post #5 of 24 Old 12-17-2014, 04:47 AM
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I know that there is one 6004 (upper right side) and two 6204s (lower shaft, L&R). The fourth one (upper left side) I will have to check on.

The part numbers have changed Gen1 to Gen2, but I don't know if the sizes of the bearings have changed. If not, the bearing numbers for the Gen2's might be improved.

I'll get back to you in the morning.

Tom

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post #6 of 24 Old 12-17-2014, 09:54 AM
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OK, here's the dealio. I looked into this when I blew up my motor and the deal was odd enough that I couldn't decipher my notes, so here's a re-do on past research: The upper left bearing measures 20X47X14, which makes it equivalent to a 6204. However, it is marked as an SX04A37. That ain't no kinda bearing I ever heared of. Norm? Got any clue-drops you can pour on me?


The fiche calls for a SX0415, which I ain't never heared of, either. When I Google it, though, it comes back as a Kawasaki 92045-1188
which agrees with the fiche. Googling a SX04A37 brings back only one sensible page, from NOC. That page says the data is missing.

So, there is something special about that bearing, but I don't know what it is, and I don't know if fitting a 6204 would be the right thing to do.

The good news is that all these bearings are readily available and aren't real expensive. Even the mysterious (to me) SX bearings are only $13 from Partzilla.

Tom

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“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

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Last edited by Tom Schmitz; 12-17-2014 at 09:57 AM.
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post #7 of 24 Old 12-17-2014, 07:00 PM
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That bearing is a seven ball rather than 8 as one would expect for for a 6204. This will mean a heavier cage or such modification. Likely there were design concerns that the cage would break from vibration... that's what came to mind so started looking along those lines- special bearing.

The quick check I made indicates that this is an OEM manufacture only "S" means special dimensions or features and 37 means that it is the 37th design type used in this bearing series. I will see if can find someone with NTN who is willing to dig to find out the special features of the design. I wonder if the internal clearance is greater because of a larger interference press fit into the case + the heavier cage? I don't recall a locating pin on any of the KLR balancer bearings (to keep the bearing from turning in the case) but forget and confuse with other engines as see so many apart and KLR guts not that frequently. One reference indicated an update of the OEM number from "SX04A37" to "TM-SX04A37" and that "TM" indicates a long life material. The "SX" was last produced in 2006 while the "TM" prefix is still being made.

All I can find but will try the forbearance of NTN to see what else.

FWIW, there's no way I'd use a 6204 in place as have seen this kind of substitution often go bad with other bearings such as a special ball size in the same inner and outer race dimensions. Having a balancer cage fail (the most common mechanical failure to a single row ball bearing, IME) would be nasty as the balls often run over the loose cage pieces and spread the outer race, breaking the surrounding structure.

Can't find anything on the SX0415 but since that's likely the 15th design of the 04A, it may be very old and because the design numbers aren't related to one another, just that they indicate some design change to the basic 04A, it could mean anything.

I'll continue to order those sorts of bearings from Kawasookchi. I think that the bearings inside were ordered by the owner so must be why I don't recall this issue.
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post #8 of 24 Old 12-17-2014, 09:24 PM
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Norm,

Thanks for that info! I got as far as knowing that 'SX' meant special, but could not decode more than that.

The SX04A37 is the old part number; the SX0415 started with the Gen2 bikes. I suppose it's because the other bearing went out of production.

That bearing does have seven balls.

Tom

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“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
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post #9 of 24 Old 12-18-2014, 12:36 PM
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It would be useful to know if the dimensions have changed between Gen1 & Gen2. I'm too would up with family stuff right now to even think straight but hope that we can get to the bottom of that as it may point to something useful.

I wonder if the reason for the "TM" was because of some failure pattern (unlikely, IMO) or just the wish by Kawasaki to improve the product?

If someone who has one in hand would please measure the cage thickness, that might be useful information, if only to clarify the difference.

Tom, any chance that the failure one which you encountered was an eight ball (i.e. wrong) bearing? Wish there was more time to look into this as someone else had reported a failure at one point so would be interesting to PM in case he hasn't seen this thread.

I will see if can get further with NTN when get a bit of time. I'm certain, from doing these kinds of investigations in past, that we will find that this bearing is only made in batches for exclusive supply to Kawasaki because there is no general market sufficient to support a general production and sale.
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post #10 of 24 Old 12-18-2014, 01:33 PM
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Norm -

It should have had the SX0415 bearing. If we can decipher that, we'll know.

I know it had at least three balls, as that's all I ever found...

Tom

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“On the way downtown I stopped at a bar and had a couple of double Scotches. They didn't do me any good. All they did was make me think of Silver-Wig, and I never saw her again.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem
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