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Gasket Cylinder Base (th) 3,0mm,

MALOSSI 139/166cc for Vespa
125 GTR 2°/TS/150 Sprint 2°/V
/Super 2°/PX80-150/PE/Lusso

Thick base and head gaskets / spacers are required for raised cylinders and crankshafts that have a longer stroke. When using a long stroke crankshaft, the half length of the additional stroke has to be compensated for by a head and/or base gasket. With compensation by a base gasket, the outlet times are lengthened and the transfer times are also clearly longer. If the outlet is also lifted somewhat by milling, it is possible to optimise the engine for higher revs. Compensation with a head gasket lengthens the outlet and transfer times only slightly, with the transfer timeing changing more than the outlet timeing (= less blow down). This represents an optimisation for more torque at middling revs.

If you install a 60mm instead of a 57mm crankshaft on a MALOSSI 210cc, the 3mm further stroke have to be compensated for a 1.5mm gasket. The following then applies:

1.5mm compensation, base: Wide revs range and high HP, but limited torque and boost to performance that is both late and only occurs suddenly.

1.5mm compensation, head: Extreme torque and risk of wheelies in the lower rev ranges but lower top speeds. On the 210cc, this is SIP's favourite touring combination, also in combination with long transmissions.

The raising of the POLINI 130cc in combination with a 54mm crankshaft is also popular, and rewareds with power, durability and winning positions. With a longer con-rod, the stroke does not change, but the cylinder has to be raised accordingly by the difference of the con-rod lengths. The base gaskets are available in 0.5mm - 10.0mm, the head gaskets are available from 0.5mm - 2.0mm. They are mostly made from aluminium.

Conclusion: Long stroke crankshaft tuning with different spacer combinations is the performance increasing trend of recent years. This is where the wheat is separated from the chaff.


SIP-TIP: Do not forget the suitable long stroke crankshaft! With thick spacers, longer stud bolts are also required as well.

Customers also searched for this article with:  packing cylinder base, packing cylinderbase, spacer, alluminium, ally, ally, aloy, alloy

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Product forums
icon scootermodels This product fits the following models
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
LML Star 125 2T/ DLX / Via Toscana / Deluxe 125 2T AC
LML Star 150 2T / DLX / Via Toscana / Star / Stella / Belladonna RV 150 2T AC
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA 125 GTR 125 VNL2T 2T AC `68-`78 138957 ->
VESPA 125 TS 125 VNL3T 2T AC `75-`78
VESPA 150 Sprint 150 VLB1T 2T AC `65-`74 105200 ->
VESPA 150 Sprint Veloce 150 VLB1T 2T AC `69-`79
VESPA 150 Super 150 VBC1T 2T AC `65-`79 328129 ->
VESPA COSA 1 150 VLR1T 2T AC `87-`90
VESPA COSA 1 125 VNR1T 2T AC `88-`91
VESPA COSA 2 150 VLR2T 2T AC `91-
VESPA COSA 2 125 VNR2T 2T AC `91-
VESPA P125X 125 VNX1T 2T AC `77-`82
VESPA P150 S 150 VBX1T 2T AC `78-`90
VESPA P150X / PX150 E 150 VLX1T 2T AC `78-`85
VESPA P80 / P80 E (Frankreich) 80 V8A1T 2T AC `80-`84
VESPA P80X/PX80 E 80 V8X1T 2T AC `81-`83
VESPA PX 80 E Lusso/ EFL/ Arcobaleno / Elestart 80 V8X1T 2T AC `83-`90
VESPA PX100 E 100 VIX1T 2T AC `83-`84
VESPA PX125 2011/ 30 Jahre 125 ZAPM74100 2T AC `11-
VESPA PX125 CAT 125 ZAPM50100 2T AC `07-
VESPA PX125 E 125 VNX2T 2T AC `81-`83
VESPA PX125 E `98 / Millenium 125 VNX1T 2T AC `98-`05
VESPA PX125 E Lusso/EFL/Arcobaleno / Elestart 125 VNX2T 2T AC `83-`97
VESPA PX150 2011 150 ZAPM74200 2T AC `11-
VESPA PX150 E `98 / Millenium 150 VLX1T 2T AC `98
VESPA PX150 E Lusso/EFL/Arcobaleno / Elestart 150 VLX1T 2T AC `83-`97

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