AKF Medium kit for tuning engine 70ccm - 85ccm, with long 5-speed gearbox and 5-plate clutch

AKF Medium kit for tuning engine (70ccm to 85ccm)


- Kit for a new engine
- All components are designed for a stable tuning engine
- Kit includes a 5-speed gearbox with long 1st and 5th gear
- Includes 5-plate clutch
- Crankshaft with 44mm stroke and 85mm connecting rod, cheeks milled and balanced for higher piston weight
- Engine housing spindled to Ø 54.2mm
- All necessary starting and compensating washers in various thicknesses available
- Small sprocket 14 teeth with matching speedometer drive 15 teeth
- Clutch cover with opening for RPM drive (with blind plug)
- Includes neutral contact

Attention:
This kit requires its own cylinder + piston + head and carburetor!

Details 5-speed gearbox:
- long 1st gear, significantly improved connection to 2nd gear
- long 5th gear, 24 teeth (fixed wheel) / 32 teeth (loose wheel)
- optimized draw wedge installed
- delivered already partially assembled

Details 5-plate clutch:
- Tuning driver with retaining ring and reinforced plate spring 1.6mm
- 8-fold riveted clutch basket, straight-toothed (54/17)
- Needle-bearing clutch pressure plate (ZT-Tuning)
- Clutch discs A12 with reinforced driver lugs (power absorption up to 20 Nm)
- Tuning clutch plates
- ZT Performance clutch plate


Other significant components:
- Gasket set Kautasit
- high-quality cylinder roller bearings for extreme load (crankshaft)
- Screwed shift drum spindle
- Needle bearing for shift drum
- Optimized swivel lever
- Sealing cap CNC
- Reinforced fastening claws

Details engine housing:
- Housing bore engine block spindled to Ø 54.2mm
suitable for:
- Cylinder 70ccm with liner 50mm / 53mm
- Cylinder 85ccm with liner 54mm
- Cylinder 85ccm with liner 54mm, bored and ground to 50mm piston size


The delivered engine kit consists largely of individual parts! Assembly should generally be carried out by an experienced Simson engine builder with suitable tools. (e.g. engine assembly stand, heat lamp, shift adjustment tool, etc.)
In the first operating hours, the engine should be moved gently and preferably with the fuel mixture 1:33. (We expressly recommend Motul 800 2T Road Racing)
The determined performance values serve only as an example! The decisive influencing factors for this are the cylinder used, the exhaust, the drive train, the ignition system, the jetting, and the air filter used.
The use of an 85ccm cylinder, which has been bored and ground to over 50mm piston size, is technically possible, but not recommended. We strongly advise against it. (Wall thickness of the liner below 2mm!)