KX21 Specifications

Subaru 4 Stroke Go Kart racing engine Information.

The KX21 is a 211cc 4 stroke single cylinder racing engine with an overhead camshaft that has been designed as a kart engine for recreational & hire karts to be used at a maximum rpm of 5000.

The Subaru KX21 is fitted with a cast iron flywheel.

When purchased new you KX21 Kart Sports engine will be supplied with an RPM limiter Subaru Pt# 278-75601-10


Air cooled,

4 cycle

slant single cylinder

OHC design

Displacement 211cc

Bore x Stroke 67 x 60mm

Compression ratio 10.0 to 1

Max Output 6.8kW 9.2 HP @ RPM 5600

oil capacity of 600 ml of SAE10w-30

Valve clearance 0.15mm

Cylinder head tension 20 to 22 foot lbs or 27 to 29 N-m

Spark plug pt# NGK-BR-7HS or Champion RL78C

Engine weight dry 15 KG


We can supply factory delivered Subaru KX21 Kart Engine Australia wide from $49.00 our entry level kit is as pictured.


We can supply clutches to suit KX21 Subaru Kart engines, With top quality USA made go kart clutches from Noram, Inferno,Premier Stinger & Premier Titan, plus flat or Angled AussieSpeed light weight heavy duty engine base plate mounts that can be retro fitted to existing 2 stroke style go kart engine mounts


Subaru Go kart engine packages are available in 5 standard packages, We can also put together personel packages to suit your needs or club or association rule set packages.

We offer the range of AussieSpeed power pipes & 4 stroke AussieSpeed exhaust mufflers designed for standard factory built engines,


Our Subaru KX21 racers package #5 includes engine clutch,AussieSpeed Power pipe & muffler, engine mount, 219P clutch with choice of teeth count,fuel pump,clutch retaining bolt & Redline synthetic racing 4 stroke go kart oil.