What does 0.25mm undersize mean for these bearings?

This means the bearings are manufactured to be 0.25mm smaller in diameter than the standard size. This is typically done when the crankshaft journals have been machined down (ground) to remove imperfections or wear, and the new bearings need to match that smaller journal size.

What is the purpose of main bearings?

Main bearings support the crankshaft within the engine block. They create a precise clearance for the crankshaft to rotate smoothly while allowing a thin film of oil to lubricate the surfaces and carry away heat.

Does this set include all the main bearings needed for the engine?

This specific set includes the #2 and #4 main bearings. Depending on your engine's design, you may need additional bearing sets for other positions.

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Specifications

Brand: King Engine Bearings
Part #: MB1337XP0.25-3
UPC: 611500623349

King Engine Bearings Kawasaki ZX-14 (2006-2011) #2/4 (Size +0.25mm) Main Bearing Set

Name: King Engine Bearings Kawasaki ZX-14 (2006-2011) #2/4 (Size +0.25mm) Main Bearing Set
Brand: King Engine Bearings
SKU: king-engine-bearings-king-engine-bearings-kawasaki-zx-14-2006-2011-2-4-size-0-25-t14-770276
Price: 12.44 USD
Availability: BackOrder

$12.44

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King Engine Bearings Main Bearing Set MB1337XP0.25-3 for Kawasaki ZX-14 (2006-2011). This is a 0.25mm undersize main bearing set.

Key Features

Fits Kawasaki ZX-14 (2006-2011).
This is a main bearing set, specifically the #2 and #4 positions.
The bearings are machined 0.25mm undersize.
Manufactured by King Engine Bearings.

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About this part

Product Details

This is a King Engine Bearings Main Bearing Set, part number MB1337XP0.25-3, specifically for the Kawasaki ZX-14 motorcycle from 2006 to 2011. These are the #2 and #4 main bearings, and they are machined 0.25mm undersize, which is important if you are re-honing your crankshaft journals to match.

King Engine Bearings are known for their well-built components. This set is designed to provide reliable performance for your engine's critical main bearing surfaces. Proper bearing clearance is essential for oil flow and supporting the crankshaft under load, and using a set like this ensures you have the correct specifications for your rebuild.