Cush Drive 'Chatter'

[david edgcombe]

Hi,

Having the rear wheel of my KZ900-A4 restored/rebuilt. Wheel bulider advises that after cleaning hub there is evidence of 'chatter' in the cush drive. This indicates to me that the metal pegs in the coupling assy that hold the cush drive rubbers are coming into contact with the hub! Have checked all the hub parts against shop manual and z-power/klasmo parts fiech and all seem ok, the only differnce I can see is that I don't have a thin six hole spacer that is shown fitted under the sprocket Part 92026-108. This does not seem to be stocked by anyone so is it required? The only other thing I notice is that the center bearing is a fairly loose fit in the hub, there is no free play but it does not need to be driven out as suggested in the shop manual, perhaps indicating that this bearing in the hub may be allowing some movement with the bearing in the cush drive? Any advice would be appreciated, just spent a fortune having the wheel restored so I will be ****** off if the hub turns out to be knackered!

[Garn 1]

David, I would firstly suspect the rear-sprocket bearing, one of the three that are on the rear axle. So give that a try first (see if it has excessive play).

I understand the thin six hole spacer is for converting the Z1 & Z1A's to accommodate the later O-ring chains of the Z1B & the Z900-A4.

I have seen many cush-drives wearing heavily on the hubs inner surface. I never did solve it, otherthan to ensure they were assembled correctly and not worn. Further, there was a method of filling the gaps between the cush and the drive lug with a hard setting rubber solution.

RegardZ.

[ROZZER]

Try glueing pieces of old inner tube to the undriven faces of the drive lugs using Evostik, works a treat at taking up and slack in the worn rubbers and is a cheap as chips solution. I would also check the bearings as suggested. The spacer fitted behind the sprocket won't make any difference, as stated this is to allow o ring chain use and was standard fitment on the B but is now NLA part, you could easily make one if you have some 1mm sheet ally or steel, bit time consuming tho'. I have a B, not fitted with the spacer and don't appear to have any problems so havn't bothered making one.

[david edgcombe]

Thanks chaps for the advice, the fist thing I will do is to check all three hub bearings. One other suggestion raised by the wheel restorer (and he has done many Zeds) is that I may not have a Z900 hub fitted! I had not considered this as the bike is almost entirely original right down to the TAKASAGO rims and rims/spokes/hub all looked to have aged at the same rate with no new bits! The reason the wheel builder thinks the hub might not be a Z900 hub is that he says that the aluminium land that the spokes are laced through on the cush drive side should be vertical outer face on the Z1-Z900 whereas my hub has the same non-vertical face as on the brake drum side? Have looked in my Kawasaki Z900 shop manual but the drawing of the hub does not seem to bear out what he is describing! he has suggested that I may have an H2 hub! Is this possible? Is there a definitive way to check the hub is correct? I know the part number is 42005-030 but will this be stamped on the hub? Thanks in advance for any further davice.

[phil churchett]

David, can you post a pic?

[david edgcombe]

Phil,

As soon as I get the wheel back from the builder will post a pic.

Thanks

[RALPHARAMA]

Why is the builder building the wheel if he believes you have the wrong hub?

[phil churchett]

Good point from Ralph. If he/you are unsure that it is correct, delay the wheel build until you are positive you have the right one.
If need be, i can take a pic of my A4 rear wheel for you.

[phil churchett]

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David,
are these pics any help?