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Crankshaft long stroke -BGM Pro Touring (rotary valve) 51mm stroke, 105mm conrod- Vespa P80X, PX80

BGM031081G
€149.00 *

incl. VAT plus shipping costs

In stock: can be delivered or picked up in the store
Bearings
sizes: 15x19x20mm
Gudgeon pins
diameter: 15 mm
Crankshafts
stroke: 51 mm
thread rotor side: M11x1,5 right-hand thread
thread drive side: M12x1,5 right-hand thread
diameter crankwebs: 98 mm
diameter bearing seat rotor side: 25 mm
diameter bearing seat drive side: 25 mm
diameter oil seal seat rotor side: 24 mm
diameter oil seal seat drive side: 31 mm
full circle crankshaft:
crankcase has to be milled:
engine casing has to be modified:
Connecting rods
length connecting rod: 105 mm
diameter small end connecting rod eye: 19 mm
P For this item you get fidelity point/s
Long stroke shaft BGM Touring for Vespa PX80. A specialty that is only available from BGM. For...Continue reading

Description


Long stroke shaft BGM Touring for Vespa PX80. A specialty that is only available from BGM.
For all friends of PX80 tuning we now offer a long stroke shaft with 51mm stroke for the PX80 (series has 48mm stroke). The BGM standard crankshaft already has a solid bearing (like that of the PX200 models) and is therefore more than equal to the large tuning cylinder (125cc conversion cylinder, DR135, Malossi 139). Also here we have kept exactly the same intake control angle of the original Piaggio crankshaft.

So remains the possibility to build a powerful touring engine that brings all the everyday qualities of a production engine. Compared to an original crankshaft, the balancing factor has been improved and the intake area has been rounded and polished. The rotary vane sealing surface in the motor housing can be extended for an additional increase in performance.

The additional stroke of 3mm turns a DR135 into a DR144. A Malossi 139 reaches almost 150ccm. The extended control angles allow to change the power characteristics according to your own ideas. For the PX80 with long stroke shaft, we recommend stroke compensation with a 1.5 mm thick cylinder head gasket. The control angles are thus already raised considerably, the willingness to perform and the willingness to turn are increased. For some combinations it is recommended to extend the outlet window/outlet channel upwards. Otherwise, the outlet forward angle becomes too small due to the disproportionate increase in the overcurrent angle which occurs with all motors converted to more stroke. Then the cylinder has longer steering angles in the whole, but cannot convert this because the exhaust fumes cannot escape early enough. For touring engines an exhaust of about 25° KW is well suited, the larger the exhaust the higher the possible peak power with possibly then torque losses in the lower speed range.

DR135

series stroke 48mm

Outlet angle°

Overcurrent angle°

Preemold°

155

115

20

Malossi 139

182

120

31

SC Conversion cylinder 125ccm

155

110

22,5









Long travel 51mm

Outlet angle°

Overflow angle°

Preemold°

DR135 +Head gasket 1,5mm

158

121

18,5

DR135 Head gasket 1,5mm (+ 2mm diffuser height)

168

121

23,5

Malossi 139 Head gasket 1,5mm

184

126

29

Malossi 139 Head gasket 2,0mm (foot -0,5mm)

182

124

29

SC Conversion cylinder 125ccm Head gasket 1,5mm

158

117

20,5

SC Conversion cylinder 125ccm Head gasket 1,5mm (+ 2mm diffuser height)

168

117

25,5



The delivery includes the upper connecting rod bearing. New crankshaft bearings and shaft sealing rings can also be ordered if required. Installation tools as well as complete motor revision kits for easy and damage-free installation are of course also available in the shop.

  • stroke: 51mm (48mm series)
  • piston pin Ø: 15mm
  • connector length: 105mm

suitable for all PX80 motors (V8X1T/V8X1M)

"
(machine-translated)
 

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