marccleave Posted February 9, 2015 Share Posted February 9, 2015 As well as being my daily transport this is also a running project! It has its ups and downs... When its behaving itself it looks something like this: But following a spectacular main bearing failure I'm now in the process of rebuilding the 2A8 engine... Took a few minutes to remove the engine from the bike and get it on the bench. Does anyone know where I can source the correct right hand main bearing with the groove in it for the retaining clip??? 6304NX2 I seem to recall... Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 9, 2015 Moderator Share Posted February 9, 2015 Any decent bearing supplier should have/get you one Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 9, 2015 Moderator Share Posted February 9, 2015 Google Ty trials. You will get every single part you need from them. Rebuilt mine twice with parts from them and have no complaints on price or service. 1 Link to comment Share on other sites More sharing options...
marccleave Posted February 9, 2015 Author Share Posted February 9, 2015 Any decent bearing supplier should have/get you one I've already got my local bearing supplier on this and they're looking into it for me, thought I'd ask anyway. Google Ty trials. You will get every single part you need from them. Rebuilt mine twice with parts from them and have no complaints on price or service. Just looked them up, found a few parts I require that I haven't found anywhere else! Cheers! Right then, after dissassembly... the left hand main bearing does not want to part from the crankshaft. Took it to my friendly engineering shop and got them to remove it. Water keeps getting into my gearbox and I think I've finally found out how! Note, gearbox oil should not be this colour!!! O_o Found how its getting in me thinks... Its going to be a pain to remove, look at those corroded heads! And check this out... crankshaft oil seal not sitting correctly. Oh dear... Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 9, 2015 Moderator Share Posted February 9, 2015 you might end up drilling the heads off but you will still have something to get some vise grips on if you do that Link to comment Share on other sites More sharing options...
Simon46 Posted February 9, 2015 Share Posted February 9, 2015 Eck. Ive done this in 2014. Pushed impact driver with BRAND NEW BIT Into heads. Worked ok for me. S. 1 Link to comment Share on other sites More sharing options...
blackhat250 Posted February 9, 2015 Share Posted February 9, 2015 Good bit of work going on here, since when did yams start using NX bearings [ grooved] Kawasaki had them on gear shafts. on horizontal split casings. cant see how they"d work on vertical split engines,, Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 9, 2015 Moderator Share Posted February 9, 2015 that's a very good point john Link to comment Share on other sites More sharing options...
marccleave Posted February 9, 2015 Author Share Posted February 9, 2015 Eck. Ive done this in 2014. Pushed impact driver with BRAND NEW BIT Into heads. Worked ok for me. S. That'll work for the two heads that are still intact. One of them is almost non existent! Eeek! Good bit of work going on here, since when did yams start using NX bearings [ grooved] Kawasaki had them on gear shafts. on horizontal split casings. cant see how they"d work on vertical split engines,, Who knows! - I'm not Yamaha! Ta da, picture: Link to comment Share on other sites More sharing options...
blackhat250 Posted February 9, 2015 Share Posted February 9, 2015 I built my H2 a few times , the grooved bearings had a half clip, it was to stop lateral movement, [ so I was told] that another reason you get missed gears,[false neutrals] if theres wear [ even 1 or 2 mm] on bearings the shafts move away from each other enuff to miss gear selection, couple this together with worn selectors and its rebuild box time, Anyway the mains were normal bearings held from spinning in the cases by a smear of locktight,, Link to comment Share on other sites More sharing options...
marccleave Posted February 10, 2015 Author Share Posted February 10, 2015 The new right hand main bearing I was supplied (supplied 6304 not 6304NX2) does not have a groove. I rang up the supplier about said missing groove and after some research they said that all bearings they could/would supply would not have this groove and that I would have to find it elsewhere. Oh well! Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 10, 2015 Moderator Share Posted February 10, 2015 I've just been on the phone, if you send your old bearing to bridge engineering in Stalybridge they will see if it's the same a 6304NR they arent sure what the prefix NX is Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 10, 2015 Moderator Share Posted February 10, 2015 Thought only the output shaft bearing had a ring. Mine dont have one. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 10, 2015 Moderator Share Posted February 10, 2015 I've never seen one either, what's the purpose of the snap ring? Link to comment Share on other sites More sharing options...
marccleave Posted February 10, 2015 Author Share Posted February 10, 2015 The retaining plate goes over the snap ring. With the snap ring in the bearing it keeps the bearing in the engine case. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 10, 2015 Moderator Share Posted February 10, 2015 I can see where the confusion lies, you led us to thinking you ere referring to a crank bearing because you called it a 'main bearing' it's the gearbox output shaft bearing isn't it. Link to comment Share on other sites More sharing options...
marccleave Posted February 10, 2015 Author Share Posted February 10, 2015 Yes you are correct! My mistake!!! Just checked the engine casing. Guess which bearing is still sat in the engine case and guess which bearing I removed (and for some reason) assumed I removed the right hand main bearing. D'oh!!! Don't I look like a right plank now. :crazy: We learn from our mistakes though, don't we?! Link to comment Share on other sites More sharing options...
Moderator Cynic Posted February 11, 2015 Moderator Share Posted February 11, 2015 Shows we know our Dt mx's as well. Link to comment Share on other sites More sharing options...
marccleave Posted February 13, 2015 Author Share Posted February 13, 2015 If an engine/frame number were to begin 2A8 ... then what would the year(s) of said bike be? Link to comment Share on other sites More sharing options...
Moderator Airhead Posted February 13, 2015 Moderator Share Posted February 13, 2015 They all begin 2A8 Marc, It's the rest of the number that's needed Link to comment Share on other sites More sharing options...
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