This bushing is important as it supports the timing-side crank journal and must be sized correctly to allow oil flow to the big-end journals. A worn crank bush will produce low oil pressure and can cause the rod bearings to seize on the journals.

Made by KPMI in the US, this timing-side bushing is for Triumph part number 70-4322 and fits all Triumph 350 and 500 Unit Twins from 1957-1968. It is available in (3) undersizes to accommodate a machined crank journal.

The bush supports the timing-side main journal of the crankshaft and provides lubrication from the oil pump to the rod bearings. It is installed directly into the timing-side of the crankcase and is an interference fit.

Use the drop down menu to select what size bushing you need.

Please refer to your parts catalog for proper fitment.

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.