OE replacment Tri-metal For Smart OM 639.939 - MB1300SX

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The SX/XA Series by King Bearings is a reinforced Copper-based material with higher Tin content. Designed as an OE replacement, it is well-suited for both medium and high load engines.
Commonly use for medium and high load engines. Enables higher load capacity than conventional tri-metal bearings
Crankshaft Dim. Housing Dim. Length Thickness
54.97 / 54.94 mm
2.1640 / 2.1630 inch
59.02 / 59.00 mm
2.3236 / 2.3228 inch
17.7 mm
0.697 inch
2.016 mm
0.0794 inch
Main Bearing Set For SMART OM 639.939 - MB1300SX
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Performance features

Material features

Tech Features

Copper Based
Copper Based
Tri-Metal Copper based material

Leaded or Lead Free tri layers bearings for low to heavy load engines.

Tri-M+™
babbit plus
Enhanced Babbit Overlay

Strengthened Babbit overlay for medium and high load engines.

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