274,00 € *
The bgm PRO Racing Shaft with 54 mm stroke is the maximum for racing or ambitious road tuning.the cheek diameter has been enlarged in contrast to a normal shaft to achieve the necessary higher overlap at the crankpin despite the increased stroke and thus additional torsional resistance. This minimizes the risk of twisted cheeks and a welding with the usual disadvantages is not necessary.

The engine housing must be spindled out to Ø88 mm in the area of the crank webs to accommodate the shaft.

  • anti-twisting,Stable cheeks
  • High quality 105mm long connecting rod with 5mm thickness
  • Good lubrication holes and slots
  • Reasonably dimensioned thrust washers
  • Lower precompression >/li>

  • Favourable deflection angle at the connecting rod bearing >/li>
  • Thick tapered stub of the ETS models >/li>
A huge advantage is the high-quality 105 mm long connecting rod, with cleanly executed lubrication holes and now 5mm thick. This is eight millimetres longer than the standard connecting rod of the 125cc. The advantages of the longer connecting rod are a more favourable deflection angle and the resulting lower friction of the piston in the raceway.

This increases the performance and results in a lower pre-compression, which works great especially with the new reso systems such as the Feuerzauber from Ludwig und Scherer. Also the transition at the overflow to the engine housing can be made much more flow-favorable, which results in a better performance.

We also recommend the spacer (BGM0223) to distance the cylinder and to keep the control times the same. Furthermore, longer M7 studs (BGM 0290) must be used. All this is included in the kit (7673184).


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Ball bearing
Dimensions
15x19x20mm
 
Piston pin
Diameter
15 mm
 
Crankshafts
Stroke
54 mm
Crank web diameter
87 mm
Crankcase must be spindled
nein
Motor housing must be modified
ja
Rotary vane crankshaft
nein
Full cheek crankshaft
ja
Filling material for full cheek
Stahl
Bearing seat diameter on alternator side
25 mm
Bearing seat diameter on drive side
17 mm
Diameter of sealing ring seat on alternator side
24 mm
Diameter of sealing ring seat on drive side
22.7 mm
 
Connecting rod
Connecting rod length
105 mm
Connecting rod eye top diameter
19 mm
 
General
EAN
4250366692746
 
OEM numbers (for comparison purposes only)
Scooter Center:
7673184
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