Kohler CH640-3164 20.5 HP Command PRO Horizontal Engine, Flush Crankshaft, Remote Air Cleaner, Fuel Pump (for Exmark)

The Kohler CH640-3164 is a 20.5 HP 674cc Command PRO V-twin horizontal-shaft engine with flush crankshaft, remote air cleaner, a fuel pump and 15 amp charging. This spec is built for Exmark equipment.

Kohler Engines now operates under the name Rehlko. This is the same genuine Kohler CH640-3164 engine (Rehlko spec PA-CH640-3164); new units may carry Rehlko branding.

Why buy the CH640-3164 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: Flush crankshaft
• Remote Air Cleaner
• Fuel pump included
• Electric Start, 15 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

• Factory replacement for older specs CH641-3015, CH641-3018 (Exmark).
• 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 CH640-3164 a Kohler or a Rehlko engine?

Both. Kohler Engines rebranded to Rehlko; the design, factory and part number are unchanged. Kohler CH640-3164 and Rehlko PA-CH640-3164 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?

Flush crankshaft (horizontal shaft). Always confirm against your original engine before ordering.

What does the CH640-3164 replace?

It is the factory replacement for CH641-3015, CH641-3018.

Is this a genuine OEM engine?

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