Used OEM BMW F800 Crankshaft + Rods + Balance Shaft 2006-2018 | Bottom-End Core

📦 Complete Bottom-End Package

• Crankshaft × 1: With factory timing gear intact.
• Connecting rods × 2: Both rods with caps included.
• Balance shaft × 1: The F800 engine's signature balance shaft that smooths out the parallel twin's secondary vibrations.
• Bearing set: Original bearing shells as pictured (replacement with new bearings is still strongly recommended).

Sourcing these components individually from a BMW dealer would cost over $1,500 USD with shipping. Buying as a complete set saves both time and money.

⚠️ Honest Condition Disclosure — Read Carefully

• Source: Removed from a running BMW F-series engine. The engine was operational at the time of disassembly.
• Visual Condition: Main bearing journals and rod journals appear bright and clean with no visible scoring or surface defects. Splines, threads, and timing gear teeth intact.
• What We Have NOT Done: No precision measurements have been taken. Journal roundness, runout on V-blocks, rod weight matching, and balance shaft condition have NOT been verified.
• Mileage: Unknown — we cannot verify service history.
• This Is Not a Reconditioned Crankshaft: It is a structurally complete core that needs professional measurement and new bearings before it goes back into an engine.

🔧 Who This Is For

• BMW specialist shops rebuilding F-series bottom ends with in-house measurement capability.
• Experienced home rebuilders with access to micrometers, dial bore gauges, V-blocks, and a precision scale.
• Donor engine projects where the buyer plans to send the crank out for inspection and polishing before reuse.
• NOT FOR: Direct bolt-in installation. Anyone expecting a measured, reconditioned, ready-to-install crank should look elsewhere.

Attribute	Specifications
Current OEM Part Number	21218537774 (21 21 8 537 774)
Supersedes	11217702432
Compatibility	F650 GS (2007-2012), F700 GS (2012-2017), F800 GS (2006-2018), F800 GS Adventure (2013-2017), F800 GT (2011-2018), F800 R (2005-2018), F800 S (2004-2010), F800 ST (2004-2012)
Engine	798cc Parallel Twin (BMW K7x platform)
Condition	Used, AS-IS. Removed from running engine. Journals visually clean, splines intact. NOT measured.
Components Included	Crankshaft × 1 (with timing gear), Connecting rods × 2 with rod caps, Balance shaft × 1, Bearing set as pictured
NOT Included	Crankshaft seals, woodruff keys, rod bolts (new bolts recommended), thrust washers
Country of Origin	Germany (Genuine BMW OEM)

🔴 Required Before Installation — Professional Measurement Mandatory: Before installing, a qualified machinist MUST verify: (1) main journal diameter and roundness against BMW service manual spec, (2) rod journal diameter and roundness, (3) crankshaft runout on V-blocks, (4) rod weight matching, (5) rod small-end and big-end bore condition, (6) balance shaft journal condition. Install with new rod bolts (torque-to-yield), new crankshaft seals, and verify all bearing clearances with Plastigauge or equivalent.

🔴 Final Sale / AS-IS Terms: This crankshaft assembly is sold as a builder's core. Surface inspection only — no measurements have been taken. No warranty on journal roundness, runout, rod straightness, weight matching, or balance shaft condition. Suitable ONLY for engine rebuilders with precision measurement equipment. NOT suitable for direct bolt-in installation. No returns accepted except for genuine not-as-described claims with photographic evidence. Buyer is responsible for VIN-based fitment verification before ordering.

📦 Shipping Information
- Heavy item — packaged with extra padding to protect journal surfaces during transit
- Processing Time: 3 Business Days
- USA: 7–15 Business Days (Standard Air) · 25–30 Business Days (Sea) · up to 40 Business Days if customs inspection
- Europe: 7–15 Business Days (Standard Air) · 35–40 Business Days (Economy Truck/Rail)
- Other Regions: Contact us for a quote