What does '+0.25mm undersize' mean for these bearings?

This means the bearings are designed for a crankshaft that has been machined down by 0.25mm. This is common during engine rebuilds when the crankshaft journals have been ground to remove imperfections or to prepare for new bearings.

Which positions do these main bearings fit on the Kawasaki ZX-14R?

This set is specifically for the #1, #3, and #5 main bearing positions on the engine's crankshaft.

What is the advantage of the XP tri-metal material?

The XP tri-metal construction offers enhanced load-carrying capabilities and better compatibility with different types of engine oils, contributing to improved bearing durability and performance.

Specifications

Brand: King Engine Bearings
Part #: MB1334XP0.25-5
UPC: 611500623066

King Engine Bearings Kawasaki ZX-14R (2012-) #1/3/5 (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Kawasaki ZX-14R (2012-) #1/3/5 (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-kawasaki-zx-14r-2012-1-3-5-size-0-25mm-t14-770248
Price: 12.25 USD
Availability: BackOrder

$12.25

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King Engine Bearings Kawasaki ZX-14R (2012-) Main Bearing Set. Size +0.25mm.

Key Features

This is a main bearing set for Kawasaki ZX-14R motorcycles (2012-).
The set includes bearings for the #1, #3, and #5 main positions.
These bearings are +0.25mm undersize, intended for machined crankshafts.
Features King's XP tri-metal material for improved load capacity and oil compatibility.

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About this part

Product Details

This main bearing set from King Engine Bearings is built to the +0.25mm undersize specification, meaning it's designed for crankshafts that have been machined down by that amount during an engine rebuild. These bearings are specifically for the #1, #3, and #5 main positions on Kawasaki ZX-14R motorcycles from 2012 onwards.

King Engine Bearings uses a specialized tri-metal material construction for their XP series bearings. This design offers improved load-carrying capacity and better compatibility with various oil types compared to standard bearings. The goal is to provide a durable and reliable bearing surface that can handle the stresses of high-performance engine operation, ensuring smooth rotation of the crankshaft within the engine block.

When rebuilding the bottom end of your Kawasaki ZX-14R, using bearings that are precisely sized for your machined crankshaft is critical for proper oil clearance and engine longevity. This set is intended for those specific main journal positions and undersize requirements.