Crankshaft SWIING Puch Maxi S/N (E50) +1 mm stroke 48,8 ccm 2T AC 1-speed 1969-1995

High-end racing crankshaft with longer stroke, suitable for Puch Maxi S / N, Supermaxi LG1 and other mopeds with a Puch 1-speed E50 engine.
This special full-circle crankshaft has 1mm more stroke than the original crankshaft. This gives the engine more torque, a higher compression ratio and more horsepower. It is a high-quality racing crankshaft for use in engines with significant power increases.
Highlights:

• Maximum pre-compression due to balancing holes with aluminum inserts.
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• Solid connecting rod with a stable connecting rod pin with 16mm diameter. Silver bearings with excellent emergency running properties are used as connecting rod bearings.

Important notes on use:
The additional stroke must necessarily be compensated with a 0.5mm thick stroke plate!
Sealing compound should be used between the gasket and the housing or cylinder.
The squish edge dimension should not be less than 1mm (distance between piston and cylinder head at TDC)!
The ignition-side oil seal should be additionally secured due to the increased pressure in the crankcase, e.g. with 2K glue or a retaining plate!
After installation, let the moped run for about half an hour with a richer mixture in order to run in the new crankshaft under low load.
Attention: Depending on the model, with 45mm cylinder kits at BDC, the previously compressed air may enter the intake port through the holes in the piston.
Dimensions:

• Stroke: 44mm (+1mm to original shaft)
• Weight (incl. connecting rod): 975g


• Total length cheek pin, clutch side: 74mm
• Total length cheek pin, ignition side: 66mm


• Thread, clutch side and ignition side: MF10x1mm
• Diameter, clutch side: 1st step: 22mm, 2nd step: 17mm, 3rd step: 15mm
• Diameter step, ignition side: 17mm


• Diameter crank webs: 69.9mm
• Width crank webs: 34mm


• Diameter connecting rod eye top: 15mm
• Diameter connecting rod pin bottom: 16mm
• Conrod length: 90mm

Supplied as shown in the product photo with a 12/15x14.2mm needle bearing.