KTM LC4 engine

KTM LC4 Engine is series of single cylinder engine designs produced by KTM debuting in 1987. "LC" in the name stands for Liquid Cooled while 4 indicated a 4-stroke motor. Starting development in 1982 it was designed to replace air-cooled 4-strokes with an eye toward future emission standards. The first engine introduced was the enduro racing 553 cm3 600GS. The basic LC4 design has gone on to power a range of KTM Motorcycles.[1]

History

The LC4 engine has increased in displacement over the years. The original 600 (553 cm3 actual) gave way to the 620 platform (609 cm3 actual) which became the 640 series (625 cm3 actual) from 1999 onward, then on to the 2008 version of the 690 (654 cm3 actual) the 690 v2 (690 cm3 actual) to its current 690 v3 (693 cm3 actual) size.

Used in various KTM models the LC4 equipped bikes have had various engine size related designations:

See also: KTM 690 series

2019

KTM introduces twin balancer shafts with the 690 LC4.[2]

2026

KTM releases the significantly redesigned 690 LC4 increasing the displacement to 692.7 cc (42.27 cu in) with an increases to 77.9 hp (58.1 kW) @8000 rpm and slightly reduced 53.9 ft⋅lb (73.1 N⋅m) of torque @6750 rpm. KTM made these changes, reclaiming the “world’s most powerful” single-cylinder title, in response to the announced specifications for the Ducati Superquadro Mono.[3][2]

LC4c

See also: KTM 390 series

In the 2023/24 timeframe KTM designated their new 398.6 cm3 motor LC4c.

References

  1. ^ Ron Lieback (21 Aug 2025). "KTM LC4 HISTORY: ENGINES, EVOLUTION, AND ENDURING LEGACY". KTM World. Retrieved 19 May 2026.
  2. ^ a b Vivek Sharma (20 Sep 2025). "KTM's New Single-Cylinder Engine Innovations and Strategic Positioning". Living with Gravity. Retrieved 19 May 2026.
  3. ^ ADV Pulse Staff (13 Aug 2025). "KTM Unveils Specs And Availability Of Revamped 690 Enduro R". ADV Pulse. Retrieved 19 May 2026.

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