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DEXTER RACING Item number: DEX60221
DEXTER RACING

Exhaust -DEXTER RACING Sport Production- Vespa Smallframe 100-144 cc - V50, 50 Special, ET3, PV125, PK 125 S/XL/XL2/ETS, Motovespa PK 75/PK 125, Primavera 125 T3

Compatible: Vespa V50, 50 Special, ET3, PV125, PK 125 S/XL/XL2/ETS, Motovespa PK 75/PK 125, Primavera 125 T3

Key data

Sport resonance system for powerful smallframe setups
Design: 100-144 cm³, sporty characteristics with wide usable band
Exhaust stud spacing 54/56 mm and 60-62 mm (depending on cylinder)
Manifold inner diameter 35 mm, matched to diaphragm direct intake cylinders
Tire clearance for 3.50-10
Recommendation: short fourth gear for tight connection
379,00 €*
available immediately
Shipping weight 3 kg
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DEXTER RACING Sport Production - Exhaust Vespa Smallframe 100-144 cm³

Sporty resonance system for powerful Vespa smallframe engines in the 100 to 144 cm³ range. Designed for cylinders with 54/56 mm and 60-62 mm exhaust stud spacing, for example Quattrini M1L or Italkast GRV. Early, powerful use from the lower engine speed range, clean revving up to high engine speeds - roadworthy power delivery with a throaty, clearly defined sound.

Characteristics and use

Early torque from the bottom end, smooth pulling power up to high revs
Very well suited to direct-inlet diaphragm cylinders such as Quattrini M1L 56-60
Sporty tuning with a wide usable band for road use
Compact design on the left-hand side of the vehicle, side cover can still be fitted

Technical data and compatibility

Cylinder: 100-144 cm³, exhaust stud 54/56 mm or 60-62 mm
Manifold inner diameter: 35 mm
Tire clearance: designed for 3.50-10
Mounting: without cutting on Special and Vespa 50
Primavera/ET3: Check clearance to glove compartment
PK/HP/FL2/ETS: remove inner partition under the left hood

Fitting instructions for Sport Production

Align plug connection without tension, clean sealing surfaces carefully
After installation, check freedom of movement of engine and exhaust (spring travel, side cover)
PK/HP/FL2/ETS: cut or completely remove the inner partition under the left-hand hood
Short fourth gear is recommended to keep the connection in the upper speed range

Example setup from practice

Quattrini M1L 56-60 on smallframe housing, 54 mm stroke, 28-30 mm carburetor (see performance diagram)
Very good results also on Italkast GRV with 3.50-10 tires
Wide band suitable for everyday use with strong mid-range and clean reso entry

Compatible vehicle models (selection)

V50, 50 Special
125 Primavera, 125 ET3 (note: glove compartment interference possible)
PK 125 S, PK 125 XL, PK 125 XL2, PK 125 ETS
PK 75 (Motovespa depending on market), PK 125 (Motovespa)
HP/FL2: remove inner partition on the left
Quattrini M1L 56-60
Italkast GRV
Other smallframe diaphragm cylinders with 54/56 or 60-62 mm exhaust stud spacing

Check exhaust stud spacing before ordering.

FAQ - Frequently asked questions about "Sport Production"

Yes. Due to the sporty design, a short fourth gear is recommended in order to maintain the connection in the upper rev range and to utilize the rev range of the system.
Smallframe cylinders in the 100-144 cm³ range with 54/56 mm or 60-62 mm exhaust stud spacing, for example Quattrini M1L 56-60 or Italkast GRV. Check the stud bolt spacing on the cylinder before ordering.
Yes, the Sport Production is designed for 3.50-10. In the case of special rims, wider rims or other tire sizes, the clearance should be checked in the deflected state.
Special and Vespa 50: no cutting required. For PK/HP/FL2/ETS, the left inner partition wall must be removed or cut out. On ET3/Primavera, the glove compartment may come into conflict, check clearance carefully before the first test ride.
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