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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> How do you grease the rear shock's spherical bearings?
Post Info TOPIC: How do you grease the rear shock's spherical bearings?
yamalama


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How do you grease the rear shock's spherical bearings?
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Hi all,

The top and bottom mounting points of the rear shock use spherical bearings. How do you grease these?

The Yamaha workshop manual says that the linkage bearings are polylube type that never need regreasing. Does this include the shock mounting spherical bolts? Is this still true after eight years of use?

I have just replaced the lower shock mounting bearing with one that came in the All Balls linkage kit. Is this a polylbe type. Does it need greasing?

Is it OK (or even possible) to pivot the inner race sideways 90 degrees to expose the needle rollers? The one in my shock’s upper mounting point won’t swivel more than a couple of mm sideways. Is this normal? Do you just try and force a little grease past the underside of the inner race?

Your thoughts gratefully received

Thanks, Lama



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TTRfan


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Hi Lama

Unless you are luckier than me, the polylube grid around the needles in the original Yamaha linkage bearings doesn't survive removal of the collars so the bearings then have to be greased unless being replaced.

The spherical bearings in the top and bottom shock mounts are totally different animals. They lead a very hard life and the bottom bearings don't seem to last very long at all. I think the AllBalls lower shock bearings are coated in some sort of graphite lubricating surface but I pack them out in waterproof grease to be sure. Messy job but turn the inner ball through 90 degrees and get as much grease in behind as you can - which won't be much more than a smear as its a tight fit in its housing.

The inner ball on your top shock mount is probably a tad corroded and will need working a bit to get it to move through 90n degrees. Flood it with WD40 and just keep moving it around until it frees up. Dry off the WD40 and grease as best you can to avoid the dreaded top shock bearing "squeak".

Brian



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yamalama


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Hi Brian,

Thanks for your very helpful and quick reply.
Somethink else on the list of this weekend's jobs then

Lama

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