Instruction Manual - Mi4

The Kyosho Optima Mid Legendary Series – Koswork Edition (K.30622KE) revives an icon of 1980s electric off-road racing with carefully chosen modern updates and premium Koswork hardware. Celebrated for its world championship debut and influential mid-motor belt-drive layout, this reissue keeps the classic look while integrating enhancements to suit today’s electronics and tracks.

The drivetrain adopts 48-pitch gearing for improved efficiency and fine ratio tuning, supported by an adjustable belt tensioner for smooth power delivery. Reinforced components, FRP shock stays and a countersunk chassis echo the period-correct style with contemporary precision, while the included body, wheels and tyres recreate the original Optima Mid stance.

Koswork Edition Includes

• Koswork Carbon Side Plate
• Koswork Carbon Suspension Holders
• Koswork Carbon Rear Camber Link Mount
• Koswork Carbon Rear Shock Tower
• Koswork Carbon Front Shock Tower
• Koswork Universal Drive Shafts
• Koswork Turnbuckle Set HD

Key Features

• Recreation of the classic 4WD racing buggy, updated for modern R/C electronics
• Belt-type 4WD for efficient, stable drive even on low-grip surfaces
• 48-pitch pinion and 82T spur gear; optional 78T / 80T spur settings compatible
• Reinforced slipper clutch for powerful brushless motors
• Battery holder compatible with various battery types
• New wheels in original Optima Mid design with Turbo Optima tyres
• Reinforced nylon rear wing with three mounting angles
• Blister packaging in the classic style

Additional Highlights

• Gold anodised threaded oil shocks
• FRP shock stays
• 6061 T6 aluminium, countersunk chassis
• Moulded resin belt covers
• Belt tensioner with easy adjustment
• Full ball bearing set; hex screws throughout
• Adjustable toe-angle rear hubs
• Updated steering bellcrank with integrated servo saver
• Strengthened suspension arms with stabiliser mounts
• 12mm hex drive with locking pin
• 2.2" one-piece wheels; clear body and decals to recreate the original design

Technical Data

• Length: 375 mm
• Width: 244 mm
• Height: 142 mm
• Wheelbase: 255 mm
• Tread (F/R): 208 mm
• Weight: approx. 1,600 g (with 7.2V 4000 LiPo)
• Tyres (F/R): Ø82 × 36 mm
• Motor: 540 class (sold separately)
• Gear ratio: 8.28:1

Kit Contents

• Kit chassis
• Tyres
• Wheels (white)
• Clear body
• Wing (white)
• Mask sheet
• Decals
• Hex wrench
• Cross wrench
• Shock wrench
• Grease
• Shock oil

Required for Operation

• 2-channel R/C system
• Servo
• 540 motor
• ESC
• Battery for chassis (7.4V Ni-MH or 7.4V Li-Po)
• Charger for chassis battery
• Batteries for transmitter