Honda-SOHC
SOHC.co.uk Forums => CB500/550 => Topic started by: Jimbo550 on October 19, 2012, 04:00:42 PM
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Hello all.
Wow this rebuild is becoming time consuming but i'm still enjoying it. Just found the countershaft bearing isn't looking to good and needs replacing so a quick call to david silver and i've drawn a blank. Been online "cmsnl" who are showing this part is also unavailable. Would anyone know where i might be able to find this part in order to continue my engine rebuild?
Thanks in advance. jimbo
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OK both shafts have a bearing on each end, so which one is it?
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The shaft is the countershaft which has the spline for the final drive sprocket. The bearing is refered to in the haynes manual as number 22 "ball journal bearing".
O/D 57mm I/D 25mm. Hope this identifies the part well enough.
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i have been onto the cmsnl site and located the part through the "search model" section. I selected my bike honda cb550 f1 uk 1976 and went through to the transmition diagrams in order to find my part. The part i require is number 34 on the diagram or part number 91002-283-000. This part is no longer available on the website. Is the part you have selected going to be the same part? How did you come to that part number? Thanks for you help and advice..
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Try Westernhills honda in the USA, but send an email asking if they have it as the website gives a price for everything.
If you are willing to get used its the same bearing on all the 450/500 twins and the 500/550 fours
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Thanks for the info. I've emailed western hills honda to see if they have it in stock.
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mmmm thats interesting. I was relying on cmsnl to give me the correct part number. If someone else could confirm this then i will go ahead and order the part. Thanks for the very usefull info oddjob, no wonder i was having problems finding the parts if the part number was wrong.
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Honda parts list: http://www.dotheton.com/downloads/CB550_Parts.pdf
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91002 is the bearing behind the clutch, 91001 the bearing behind the sprocket, dont forget the "O" ring that goes on before the bearing.
If you can't get a bearing try for 23220-374-000 which is the shaft complete with bearing and "O" ring-----On second thoughts it would be cheaper to get a groove ground into a standard bearing as Dave Silver sez the shaft is £190
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try here http://www.hondarestoration.com/index.htm as they show stock on some of these part numbers, the shaft Bryan mentioned is priced at $134.80 but there will be customs charges on top, the bearing 91002 286 008 is listed at $41.58. I have used this company and was pleased with the service.
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well that was confusing. I've finally ordered a part from cmsnl and i hope it's the correct part but i'm still not totally sure what i've ordered. Thank you to everyone who has helped with this topic and hopefully i'll soon be starting the rebuild.
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The difference in numbers is that the clutch bearing is an HS which means rated for higher rpm, so in theory that one, if the groove is the same and the bearing number in the book is correct, would do for both.
Jimbo, can you look closely at both of the bearings and see if the numbers on them are the same?
Those numbers came from an original japanese parts book I aquired, which is the only one i have seen for the 500 that does not have the missprint saying you need 2 centre selector forks!!
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I'll have a look this evening for and numbers on the bearing. I think the one behind the clutch is a slightly different size but I'll have a measure.
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As i said above the one that goes behind the clutch is rated for higher RPM, that is the difference.In standard bearings they used to be rated C1; C2; C3 for different speed but i can't remember which way it was!!
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Its to do with the manufacturing tolerances of the balls and tracks mate but again i can't remember wether its tighter or looser for higher speed!! (I know mine tighten up at high speed!!).
Used to fit some 'kin big expensive ones to 85 horse 3 phase motors on board tankers
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How excited was I today when I got home to find a packet had arrived. I rushed to the garage ripping the packet open and looking forward to the start of my engine rebuild. How disappointed was I when I compared the bearings to find they are different sizes. Oh well the saga continues!!!!
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Whats different mate?
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Outside diameter is 52 I think and I need 57.
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I think the problem here is a missprint in the 500/4 parts book, the two bearings are actually different sizes, the one on the countershaft is a 57 mm diameter and the one on the mainshaft is only 52mm. If you look at the part numbers for the retaining ring for the two bearings they are both different, it clearly says 52 or 57mm. So the misprint is not the part no, but the 5205 std bearing no, one of them is wrong. I also have a 550 f2 parts book and it gives same part no for the mainshaft bearing, but a different one for the countershaft bearing, in this case 91002 283 000 and the retaining clip is still the same as the old 500 manual, suggesting the two bearings are different sizes despite still saying they are both 5205 bearings! Not sure if this helps or hinders!
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I have now ordered what i hope is the correct bearing from western hills honda usa which they say will take 6-8 days for delivery (last one in stock). When i phoned to order the part i confirmed with the parts guy that the o/d was 57mm which is what i need. It would seem that cmsnl have the correct part number listed but no stock. i'll upload a couple of pics to show the bearing i got from cmsnl 52mm o/d (the wrong one) , and the old bearing i took out 57mm o/d. also a pic to show the size of the casing where the bearing fits. Hope this will help someone in the future when ordering this bearing.
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Hi. Yes finally got the correct part from western hills honda USA. Cost me about £80 for the part and shipping but it was the only one i could find. Engine back together now and ready to go into the frame. Thanks for your help.
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Blooming old post I know but the bearing referred to is the same as my CB250/CB350K twins I am currently rebuilding the 3 engines for?
Bearing is the 5205HS P/N 91002-286-008. Has anyone ever successfully ground the groove in a standard C3 high speed bearing? the ---286--- part no.is a CB250/350K twin part number BTW from1968.
Please see this post of mine regarding the output shaft corrosion.
http://www.hondatwins.net/forums/48-engine-discussion/40431-countershaft-oil-seal-surface.html
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The bearing (5205HS 2 of them )is part of this kit from Yamiya listed for the 400/4 but not sold separately. Will have to get my 'man-in-Japan to investigate for me.
http://www.yamiya750.com/index.php?main_page=product_info&cPath=179_273_206_210&products_id=3069
P.S. The main shaft output sprocket bearing 6305 with groove (specific to the CB750K0 diecast & sandcast model ) is cheap from Yamiya and a Genuine Honda part (well the one I got from them was)