basher Posted October 22, 2012 Report Share Posted October 22, 2012 Struggling at work to find the part numbers on my phone and wondered if someone could help me out as bearing factors is round corner from work and could have it sorted today or tomorow then. The original needle bearings are crap as the seal is seperate and doesn't work well. I'd like to know the part number for the decent upgraded bearing with built in seal please? Cheers andy Quote Link to comment Share on other sites More sharing options...
aussiechris Posted October 28, 2012 Report Share Posted October 28, 2012 Hi Andy, This reply might be a bit late but the bearing you need is HK1520-2RS. This is the text of a post I answered a few months back... Virtually all of the kits sold by dealers include bearings with separate seals. In my opinion these are rubbish. And yes, I know that's what comes from the factory. The original bearings are HN1516 which is a full compliment needle roller with a 15mm ID, 21mm OD, and it's 16mm wide. The supplied seals are the same dimensions but 2mm wide. That makes for an overall width of 2+16+2= 20mm. There are a number of reasons why they fail early. Firstly, the needle rollers have little tits on each end to locate them in the housing as there is no cage. For some reason, in our application, those little tits break off and get in amongst the bearings causing failure. But the main reason is water ingress. Those 2mm seals have a steel shell and that doesn't seal too well in the dog bone as it is so thin. Furthermore, sometimes the seals just plain fall out of the dog bone. The reason is quite simple. The overall width of the bearing and seals is 20mm, but if you measure the dog bones you'll find they are only about 18.8mm wide. This means (assuming the bearing is perfectly centered) that the 2mm seals have just 1.4mm to seat in. And since the seals have a bit of a radius on the inside, there's bugger all holding them in place. The bearing you want is a HK1520-2RS (contact a local bearing supplier with that number). That bearing is a caged roller with in-built nitrile seals. It is 20mm wide but even though it is slightly wider than the dog bone, it is all one piece. I've been running these bearings for about 10 years now in various bikes. You can expect 5 to 10 years life out of them compared to less than a year from the standard ones. Price is about the same. Even though the original bearings have more rollers that doesn't help if they're full of rust and mud. This only applies to the four dog bone bearings. There's another two in the underside of the swing arm with two 3mm wide seals. You can't use the HK1520-2RS in there as the total width will be too wide (40mm vs 38mm total). But those bearings a well protected and don't give as much trouble. Also, you may have to get the inner rings (bushes, sleeves) off your dealer as the bearing shops seem reluctant to hold them. Gas Gas part numbers are BT27712014 (20x15x8mm) 2 required and BT27712005 (20x15x10) 2 required. I've just replaced the bearings in my 2011 Raga. The originals lasted 11 months and we don't do much mud and water here. I hope that helps. Chris Brisbane Australia. Quote Link to comment Share on other sites More sharing options...
jandyb Posted November 3, 2012 Report Share Posted November 3, 2012 This is very interesting! Anyone else tried the HK1520-2RS bearings?? -Jan Quote Link to comment Share on other sites More sharing options...
chris falcon Posted November 13, 2012 Report Share Posted November 13, 2012 Just fitted the HK1520-2RS bearings to the dog bone of my TXT 300, went in easy and a much better job than the Gas Gas supplied ones I put in my son's TXT 80 last week. Not having to mess with the seals as well makes it quicker, the bearings inside are more robust so should last longer. Chris Quote Link to comment Share on other sites More sharing options...
andilicious Posted March 18, 2015 Report Share Posted March 18, 2015 Does anyone know if these are still current for a 2014 300 Racing? Quote Link to comment Share on other sites More sharing options...
aussiechris Posted March 19, 2015 Report Share Posted March 19, 2015 According to the parts book for your 2014 Racing 300, it is the same part number BT27714009 which is for the standard non-sealed bearing. So yes, all the above should still apply to your bike. You need the following parts to fix the dog-bone links... BT27714009 Suspension link bearing x 4 C230001 15x21x2 Oil Seal x 8 BT27712005 Bushing 10mm x 2 BT27712014 Bushing 8mm x 2 or for the sealed version... BT27714009x20 Linkage bearing HK2015-2RS x 4 BT27712005 Bushing 10mm x 2 BT27712014 Bushing 8mm x 2 The part number for the HK2015-2RS bearing is one my local dealer has now created and may not apply in your region. Just order from a bearing shop. Quote Link to comment Share on other sites More sharing options...
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