The HUDY 107051 engine maintenance kit is tailored for hobbyists servicing .21 engines. It contains dedicated pullers and pressers to remove and fit front and rear bearings efficiently, plus swap-in bushings and optional collets for use on both .12 and .21 engine formats.
Components are manufactured from HUDY Spring Steel and black-hardcoated 7075 T6 aluminum, all CNC machined to exacting tolerances. That combination gives the kit lasting strength and precise alignment for bearing work while remaining light enough for bench use.
To cover a variety of engines, HUDY provides separate collets and presser adapters that fit into this system. Options listed are:
The #107061 collet is suitable for bearings with inner diameters around 11.5mm up to 12mm, while the #107064 collet accepts bearings up to about 14.5mm, covering most common sizes used in small nitro engines.
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