KymcoForum.com
General => Technical | How To => Topic started by: Yager200i on February 22, 2015, 04:10:58 AM
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Ok, so while I've got the FrankenYager apart, I decided to splurge on hybrid ceramic silicon nitride ball bearings. They'll be micro-polished and coated with tungsten sulfide to make them rotate even more easily than ceramic bearings already do. The new rear gears that Jan Vos cut for me will also be micro-polished and coated, thus no gear break-in and less friction. This is from a company named MicroBlue.
I'll be doing this for all the bearings on the bike eventually... when I drop the new head on, I'll tear the engine down, do a full inspection, and drop in the new bearings there. For now, the new bearings will go into the wheels , clutch and rear gears.
Anyway, the bike has 12 bearings total, two of which are drawn cup needle bearings. They're the typical cheapy needle bearings that come on most GY6-based scooters, with a nylon roller cage... and the one on the clutch is worn out. Since there are no hybrid ceramic needle bearings, I'm stuck using conventional ones, but I want to go with ones that at least have a metal roller cage so they last longer.
Here's the measurements of them:
14mm bore, 20mm diameter, 12mm width
20mm bore, 29mm diameter, 18mm width
Anyone know of better drawn cup needle bearings than the cheap Chinese ones? I've tried SKS, FAG, INA, Timken... seems only the Chinese factories churn these out... strange, given that everyone riding a GY6-engined scooter has these bearings, and a higher quality replacement would likely be a big seller.
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Federal Mogul. Look up the site... They make every size I have ever needed.
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Can't find any at Federal Mogul, either.
I've got a few queries into bearing manufacturers to custom-manufacture them... if I have to buy them in bulk, then sell what I don't need, just to convince a bearing manufacturer to produce them, I will.
It's amazing that no one seems to make better needle bearings in this size... they're on pretty much every GY6-engined bike, which is pretty much every scooter ever made since the 1980s. That's gotta be millions of bikes by now.
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What clutch bearing are you referring to exactly?
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OP bet knows and I would give him a shot. CC or Debt? You have more protctions credit. Good luck bro..................it's all good .
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What clutch bearing are you referring to exactly?
91001-GFY6-90A BRG NDL 20*29*18
I've found a 20x28x18 , part number RNA5902, rated for "heavy" loads. I'm considering using it and a 1/2mm thick 29mm OD sleeve around the outside of the bearing.
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91001-GFY6-90A BRG NDL 20*29*18
I've found a 20x28x18 , part number RNA5902, rated for "heavy" loads. I'm considering using it and a 1/2mm thick 29mm OD spacer.
I guess I'll rephrase, is this the clutch bearing inside the clutch, or on the CVT cover?
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It's inside the clutch. There are no bearings in the CVT cover on this bike.
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Gotcha
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Wow, those bearings are *everywhere*... in Aprilia bikes, Moto Guzzi bikes, even Vespas.
Why don't they make a higher quality bearing than the cheap ones with nylon roller cages?
91109-KVY-901 / 91001-KCW-003 - Honda
82518R - Vespa, Moto Guzzi, Aprilia, Piaggio
0926320092 - Suzuki
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Just for closure on this thread, I ordered all the hybrid ceramic bearings for my bike, except for the needle bearings, which don't have any hybrid ceramic counterparts. The bearings cost me about $580.
In hopes of getting a higher quality needle bearing, I ordered the 20x29x18 bearing that goes on a Moto Guzzi motorcycle, and I ordered the 14x20x12 heavy-duty bearing from BocaBearings.com. I ordered 2 of each so I've got extras for the future.
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Welcome to the worlds most expensive Kymco Klub!
Since you, and I are the top idiots (as far as spending way too much) we are co chairpersons.
Anyone wishing to join can donate 37,000.00 USD to Kymco Forum, and must spend at LEAST 20 times the value of your bike on Mods.
Dress nicely, and bring cookies or cake. Please...
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I'll have you know I never spend more than $750 / month on my FrankenYager, and the total to date is no more than 10 times the original purchase price. :P
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I'm so alone...
Anyone?