Kohler CH640-3224 20.5 HP Command PRO Horizontal Engine, 1-1/8" x 2-3/4" Shaft, Low-Profile Air Cleaner, Oil Cooler (for Legend)

The Kohler CH640-3224 is a 20.5 HP 674cc Command PRO V-twin horizontal-shaft engine with a 1-1/8" x 2-3/4" crankshaft, low-profile air cleaner, an integrated oil cooler and 25 amp charging. This spec is built for Legend equipment.

Kohler Engines now operates under the name Rehlko. This is the same genuine Kohler CH640-3224 engine (Rehlko spec PA-CH640-3224); new units may carry Rehlko branding.

Why buy the CH640-3224 from RFQQQ

• Brand new, genuine Kohler OEM engine backed by the manufacturer's engine warranty
• $200 flat-rate LTL freight to the lower 48 + DC; Expedited / Need It Fast available
• Pro accounts, net terms and POs for dealers, rental yards and landscape contractors
• Real people on the phone at (646) 666-7225 to confirm fitment before you order

Key features

• 20.5 HP 674cc Command PRO V-twin engine
• Horizontal crankshaft: 1-1/8" x 2-3/4"
• Low-Profile Air Cleaner
• Integrated oil cooler for lower operating temperatures
• Electric Start, 25 Amp charging
• Oil capacity 2.0 qt (1.9 L); Rehlko/Kohler 10W-40 synthetic recommended (OCK-RKC-10440)
• Commercial-duty Command PRO design with cast-iron cylinder liners

Specifications

Fitment and replacement notes

• Muffler, mounting hardware and OEM-specific brackets are generally not included unless noted — reuse your existing exhaust and hardware.
• Before ordering, match crankshaft diameter and length, mounting pattern, PTO/clutch, fuel and wiring connections to your current engine tag. Not sure? Call (646) 666-7225 with your engine model and spec number and we'll confirm.

Frequently asked questions

Is the CH640-3224 a Kohler or a Rehlko engine?

Both. Kohler Engines rebranded to Rehlko; the design, factory and part number are unchanged. Kohler CH640-3224 and Rehlko PA-CH640-3224 are the same engine.

How much does shipping cost?

Engines ship palletized by LTL freight for a flat $200 to the lower 48 states and DC. Expedited / Need It Fast ($235.95) is available at checkout — we call you with the fastest options.

What is the crankshaft size?

1-1/8" x 2-3/4" (horizontal shaft). Always confirm against your original engine before ordering.

Is this a genuine OEM engine?

Yes — brand new, genuine Kohler engine with the manufacturer's warranty.