Engine Bearings



Careful with Bearings

Take a look at the next picture. It is not what you want. You need a C3 ball bearing for the timing side of the 650 Triumph engine. Somewhere in the past Triumph started on different bikes like the 750 and changed some bearings but kept the same part number. In 1971 somewhere they used metric bearings. This is difficult to sort out so talk to someone who knows. I noticed that a lot of the bearings we buy in 2017 are 9-10 years old. Hopefully they haven't quit making the original bearings. There are a lot of different bearings on parts suppliers shelves now.


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There are some extremely nice roller bearings on the market now. I bought one from California. I got in touch with the company in Austria to verify it was a CN as there is no indication of it. See the reply below. Since I know it is engineered to exacting standards I thought about using it but then thought about English bearings. I have seen first hand that the race is closer to one side than the other by .002-3 thousandths. I have seen this under microscope. So...I decided to stay with the English roller as it can be useful when dealing with end float. Please see the link to Pete R (R.I.P.)'s entry on the Brit Bike message board for Triumphs HERE. Then use the back button.


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This is the email concerning the bearing from Austria.


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I found a CN condition roller bearing by the BSA part number as in the next picture.


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This was the condition 3 ball bearing for timing side.


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These are the gallery of pictures. Click one. At the bottom of the pics will be a menu to bring you back here or go to the Homepage. Later in a restoration they may be worthwhile.





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