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Triumph 650 ’66-72 & 750 ’73-76 Unit ’66-72 BSA A50 A65 Main Bearing RHP MRJA 1 1/8″ CN PN# 70-2879 CN E2879 68-0625


Availability: In stock

Top quality RHP left (primary) side crankshaft roller bearing as fitted to Triumph 650 1966-72 & 750 1973-76 unit twins & 1966-1972 BSA A50 & A65 unit twins in CN (clearance normal) clearance. CN bearings are tighter than C3 and not as tight as C2. These were standard in BSA unit applications as well as many Triumph 750s. Triumph 650 twins generally were fitted with CN clearance, and to add to the confusion late T140s were fitted with C2 clearance bearings.

Always check the clearance specs for your make and model to prevent damage. Bottom line is that after 40+ years of wear and tear many engines now need different clearance bearings than they originally came with.

Crankshaft Roller Bearings in Other Conditions:

For this bearing in C3 condition click here.

For this bearing in C2 condition click here.

Other Bearings

For the ball bearing companion to this bearing click here.


Main Bearing Race Removal Tool Drift
Triumph 500 650 750 Main Bearing Race Removal Tool Drift PN# 61-7017 Z162

Useful Tools

If you’re looking to remove the race, use the race removal tool to get the job done.

Please note: Due the nature of the product, we unfortunately do not accept returns on bearings, service tools or electrical components. Please be confident about your purchase before ordering. If you have questions, please contact us.


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