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Cush drive rubbers cure
Like all of us that have the XT660`s , the cush drive rubbers wear is a pain.
I found an article some time ago on the XT660.com thread. The chain drive sprocket takes a tremendous load from the power of the engine , which causes the rear wheel bearing to wear excessively , even wearing the Chain Drive Hub Housing , The bearing will become loose in the housing at a later stage, I fitted a double row bearing as apposed th the std single *row bearing. And with Polyurethane rubbers .I got 56 000km without changing the rubbers again. You only have to machine the rear hub bearing housing 5mm deeper / The Bearing I used is still the same dia. as the original. And machine the inner spacer also 5mm shorter. It still uses the Standard Yamaha Seal http://i127.photobucket.com/albums/p...psc5bb6b14.jpg http://i127.photobucket.com/albums/p...ps36e80f90.jpg The following bearings will all work, but only the first two have rubber seals on both sides: FAG 62304-2RSR (2 seals) 4304-2RS (2 seals) SKF 4304 ATN9 (open - no seals) FAG 4304-B-TVH (open - no seals) Their size is 20x52x21mm. http://i127.photobucket.com/albums/p...1-10104855.jpg 1.Polly Rubbers R800 posted in SA ! 2.And R950 posted anywhere in the world , incl, postage 3. Euro`s *65 incl. postage |
:eusa_think: The big question everyone will want to know is...
Have you still got any polyurethane rubbers for sale? |
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Another question. What size is the new bearing? |
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Despite there are bearing with the correct inner diameter (20 mm) and the width of 20,6 mm, i.e. this one 305704-2RSR. Would this be an option or is the wider diameter of 25 mm needed to fix this issue? |
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more stable under side loads as the pull from the chain would apply... In fact is a clever idea:icon_thumright:.... My sprocket carryer will be seeing a bit of lathe time very soon.. I all ready have rubbers I made from 95A urethane sheet... they are as tight as the day I put them in still.... |
Cush Drive Rubber
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Mail me your address and I will tell you what to add for the postage ? |
You have mail.
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what size is the double row bearing? I only found one with 20x52x21. If so, wouldn't I have to have mill 6 mm deeper and shorten the inner spacer 6 mm as well? Regards Marcus |
Did anyone hear back from Hunday regarding the polyurethane cush-drive rubbers.....???
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No
Skickat fr�n min GT-I9295 via Tapatalk 2 |
Cush drive rubbers
My apologies for only getting back to you now.
The Cush drive rubbers are available now.
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Polyurethane Rubbers Now in stock . Can be posted anywhere in the world |
You have mail.
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and from me
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Mail from me too
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Cush Driver Rubbers
PM sent , Cush Driver Rubbers being mailed Today once I receive an email from Paypal
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Pm Sent from me
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Hunday cush rubbers fitted today. I had to sand off some height from the joining tab in order to get the wheel back in the swinging arm but they're in now. I'll see how they feel/last over the next few weeks.
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Hey Hunday, thanks for the rubber!
There seems to have been asked the same question a couple of times and I see the confusion, I'm not up with bearings but the only listing I could find was for 'single row bearings' sometimes listed as 62304 but same size as: 62304-2RSR Deep Groove Bearing (20mm X 52 X 21) Is this the bearing in mind? Or is there a 62304/Different bearing iv'e missed? Cheers. |
PM sent from me too.
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Fitted my Hunday supplied Polyurethane Cush Rubbers today along with the Teknik Suspension (Sydney) modified hub (in essence this is the same modification outlined in a preceding post).
So let the assembly begin � I cleaned everything, refitted the rear sprocket and test fitted the hub into the wheel to check the fit � all good so far � then I test fitted the new cush pieces � trouble begins now :evil: I had noted one post saying they had to sand the connecting web down � well after about 40 minutes of mucking around it still didn�t sit properly � so cup of coffee and a hard think � results was � use a scalpel to cut the whole bloody connector web off and trim the face flush � the rubber ones generally fall apart fairly quickly so I didn�t think that would be an issue � surprisingly when water is used the Polyurethane cuts quite easily. Managed to stab myself with the scalpel while cutting the last one and bled like a stuck pig for 5 minutes !!! Cut and cleaned up all 4 rubbers and test assembled the hub complete with cush rubbers then moved on to try and fit the rear wheel. This is the easy bit � you just have to get the wheel complete with cush drive, two spacers and the sliding rear brake calliper unit all lined up � make sure the chain is on the sprocket and then simply insert the rear axle !!! There�s no main stand on the R and without a proper bike lift in the garage this means the wheel has to be fitted on the angle so to speak � ie it makes it even just that little bit easier :icon_sad: Well after an hour of trying to get it all in place I gave up � the new cush rubbers stopped the rear hub drive from seating properly (even using the provided zip ties) and this extra couple of mm�s meant I just couldn�t get it all to fit in the space available. Yet another cup of coffee and a very very big think. Eventually I used the rear axle (together with all the other bits as spacers) to clamp up the rear hub and then snugged up the zip ties holding the seated drive sprocket to the wheel spokes � simple � well it only took two attempts � on the second go I tightened the zip ties as much as I could then used another smaller zip tie to squeeze the two sides of the connection loop together (in a sort of a Spanish Windlass approach) to create even more tension. When I unbolted the rear axle and released the tension there was still a little bit of movement but this was probably only around 1 ~ 1.5mm � so with fingers crossed I resumed the fitment process. Finally with a bit of pressure (spanner used as a lever) I managed to get all the bits to slide into place � and then by scientific application of local pressure to the axle (light tapping on the end) it all slid together and I nipped it up tight. Used the last of my spray chain lube and went for a small ride � All sweet :happy3: So all in all the complete wheel re-fitting operation took some 4 hours � What The Hell - but coffee breaks, swearing tirades and think time all included !!! It would be nice if the new rubbers wear in slightly before the next wheel change but I might just make a mental note to pack some heavy duty zip ties for the trip � just in case. I wouldn�t want to run into any problems sitting out in the Oz Desert Sun :smilies0979: However I'm sure this will be a great mod overall. |
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Managed to buy PFI 5205-2RS C3 (same specs) on a local store for 34�.
Now I have to find someone who can take care of adjustments in the hub and spacer. |
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Went to another bearing shop and this time they sold the one with the right measures but when I opened the box at home I realized it was a self aligning bearing with double row (2304) instead of a deep grove ball (62304). Dumb question: -Can I use this one instead without problem or do I have to change it again for 62304? |
Nevermind...
Went to the shop and managed to change it for the 62304 2RS :thumbsup[1]: Now let's mount it to the bike! |
I've just discovered my Cush-drive rubbers are shot at 4k miles.
Am getting prepared mentally for the Mod to machine the 'tunnel' 5mm deeper and fit the 62340 RS double row bearing, with 5mm shortened spacer. Does it matter which bearing is to the outside in the final assembly? You can call me a numpty. Thanks |
Hoping to do some of these mods if I can get the poly cush drive rubbers. Also been looking at the bearings - seems from what I can find the 62304 is a single row deep groove with rubber seals, and the 4304 is double row deep groove bearing but doesn't seem to be available with seals. Guess the 62304 is the option then - seems to be what others have found too, it's not available as a double row bearing?
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None of my bearing books "SKF & FAG" list a 62304 bearing.
the ones I find on line state they are a single row deep groove ball race... With a bit more searching I found this.. looks like FAG do a double row in the right size... http://www.google.co.nz/url?sa=t&rct...79142246,d.dGY |
This
link has both of them! Don't think you can machine the hub to 30mm deep as there would be not much left of the spacer if anything. I did think of two thinner bearings, will investigate further or just put the 62304 in - has to be better than original.
Just found these but only a budget bearing, probably good enough for this instance. |
Cheapest branded one's (FAG) that I found when I looked into doing this mod were from Germany. Even with the shipping costs, they're way cheaper than in the UK.
http://www.dswaelzlager.de/Rillenkugellager-62304-2RSR-FAG I haven't personally done the mod yet; mainly because I want to see what difference a 525 drive kit and poly cush drive rubbers have on OE carrier bearing life. |
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they should be ok.... just want to pop the seals out and pack them with a good grease... I will go down to one of the bearing surplyers & see what I can come up with.. i have had Polyurethane cush rubbers in for well over a year... cut them from 95A urethane sheet... just starting to get a bit of movement in them...after maybe 8,000km .. I think "maybe , might" a new set will last my bike a lot longer than a normal XT...The Rekluse clutch has a lot softer power delivery to the rear wheel.. |
For everyones' benefit,
Hunday's 62304 Bearing is NOT a double row bearing tho' it is a beefier bearing than the o/e bearing. Double Row Bearings are SKF 4304 ATN9 or FAG 4304-B-TVH, they are, as you would expect, fairly pricy. Edit; these bearings are open, no grease seals, so they may not be suitable for the mod |
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I think it's probably best if I amend the bearing number references in the original post to clear up any confusion. As far as I can see, from what we know now, any of the following double row bearings will do the job: FAG 62304-2RSR (sealed) 4304-2RS (sealed) SKF 4304-ATN9 (open) FAG 4304-B-TVH (open) Thanks to Pete, Harry, Chris and everyone else for their input. It seems that we have a definitive list of bearings that WILL fit! ;) OP now amended. |
I twice send Hunday a PM, but �till today no replies.... I really like to try his urethane cushdrive rubbers.
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Email him, rather than PM. It gets faster results. |
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BTW the budget bearing I listed is double row with seals, think I'll try that probably. And the 525 chain mod as I have a nearly new chain |
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Keep trying the emails. It took me about 6 to 8 weeks to get a reply, and then a further 2 weeks to get the goods! ;) |
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