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Gearbox 20/60, (3.00) teeth,

for 102-155cc cylinder, DRT
COBRA, for Vespa 50-125/PV/ET3
/PK50-125/S/XL/XL2
straight teeth

The latest technical coup from Denis at DRT is the COBRA primary drive gear kit. The cog around the clutch basket has 60 teeth, so enabling gear ratios ideally suitable for motors with a cubic capacity of between 75 and 155cc. Once installed this kit allows quick and easy adjustment of the overall gear ratio of your motor to suit road or track conditions.

 

The DRT COBRA clutch basket has strengthened aluminium spring retainer plates and reinforced primary drive shock absorber springs. The cogs themselves are made of a special grade of steel, tempered and precisely finished. The cog teeth are straight cut, CNC machined and have had metal removed to lower the overall weight. The initial primary drive gear ratio of the kit is 22/66 but the cog around the clutch basket with 60 teeth can be combined with smaller cogs that have 19, 20, 21 or 23 teeth. This results in overall gear ratios of between 2.61 and 3.16 being possible, all with the use of one single primary/clutch basket.

 

Conclusion: The Swiss army pocket knife of the primary gear conversion kits.

 

SIP-TIP: Do not forget to order a new fixing nut for the input shaft, a safety washer, new bearing and fresh gearbox oil for safe and enduring use of your motor.

 

SIP community user “Salvatore Randazzo” ESC rider on Art.-No. 1544000: “I can cover a large range of gear ratios with the COBRA kit by just changing the 'shaft' cog. In other words it offers a suitable gear ratio for go-kart tracks (3.16) through to endurance races (2.61) without having to split the crankcases every time.”

 

Gear recommendations with primary drive gear CORBA:

75cc:     COBRA 19/60 teeth + DRT input shaft Runner 40430313

80cc:     COBRA 19/60 teeth + DRT shortened 4th gear 40442400

100cc:   COBRA 21/60 teeth + DRT shortened 4th gear 40442400

130cc:   COBRA 22/60 teeth + DRT shortened 4th gear 40442400

135cc:   COBRA 21/60 teeth + DRT shortened 4th gear 40442400

              COBRA 22/60 teeth + DRT input shaft Runner 40430313


OEM Numbers (for the purpose of comparison)  pr S100 311r z60.20k (3.00-RINF) - 23971 (DRT)


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Gear Box & Gear Ratio

 
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icon scootermodels This product fits the following models
  VESPA
divider Producer/Model divider cc divider Type divider Engine divider Yr. of Const. divider Extra
VESPA 50 / N 50 V5A1T 2T AC '63-'71 not in series
VESPA 50 L 50 V5A1T 2T AC '66-70 not in series
VESPA 50 R 50 V5A1T 2T AC '69-'83 not in series
VESPA 50 Revival 50 V5R1T 2T AC '90- not in series
VESPA 50 S 50 V5SA1T 2T AC '63-'84 not in series
VESPA 50 Special 50 V5A2T 2T AC '69-'72 not in series
VESPA 50 Special 50 V5B1T 2T AC '72-'75 not in series
VESPA 50 Special 50 V5B3T 2T AC '75-'83 not in series
VESPA 50 Special Elestart 50 V5B4T 2T AC '75-'76 not in series
VESPA 50 Special Elestart 50 V5B2T 2T AC '72-'75 not in series
VESPA 50 Special Elestart 50 V5A3T 2T AC '69-'72 not in series
VESPA 50 SR / Sprinter 50 V5SS2T 2T AC '71-'79 not in series
VESPA 50 SS / Super Sprint 50 V5SS1T 2T AC '65-'71 not in series
VESPA 90 90 V9A1T 2T AC '63-'84 not in series
VESPA 90 Racer 90 V9SS2T 2T AC '71-'74 not in series
VESPA 90 SS Super Sprint 90 V9SS1T 2T AC '65-'71 not in series
VESPA 100 (UK) / 100 Sport (US) 100 V9B1T 2T AC '78-'90 not in series
VESPA 125 125 VMA1T 2T AC '65-'67 not in series
VESPA 125 Primavera 125 VMA2T 2T AC '67-'83 not in series
VESPA 125 Primavera ET3 125 VMB1T 2T AC '76-'90 not in series
VESPA PK 50 50 V5X1T 2T AC '82-'84 not in series
VESPA PK 50 S / Elestart 50 V5X2T 2T AC '82-'84 not in series
VESPA PK 50 S Lusso / Elestart 50 V5X2T 2T AC '85-'88 not in series
VESPA PK 50 SS / Elestart 50 V5S1T 2T AC '83-'86 not in series
VESPA PK 50 XL / Elestart 50 V5X3T 2T AC '85-'90 not in series
VESPA PK 50 XL FL 50 V5N1T 2T AC '90- not in series
VESPA PK 50 XL HP 50 V5N2T 2T AC '91-'91 not in series
VESPA PK 50 XL N NUOVA 50 V5X5T 2T AC '89-'90 not in series
VESPA PK 50 XL Rush / Elestart 50 V5X4T 2T AC '88-'90 not in series
VESPA PK 50 XL2 / Elestart 50 V5X3T 2T AC '90- not in series
VESPA PK 50 XLS 50 V5S2 2T AC '86- not in series
VESPA PK 80 S / Elestart 80 V8X5T 2T AC '82-'86 not in series
VESPA PK100 S / Elestart 100 V9X1T 2T AC '82-'84 not in series
VESPA PK100 XL 100 V9X2T 2T AC '86-'90 not in series
VESPA PK125 125 VMX1T 2T AC '82-'85 not in series
VESPA PK125 ETS / Elestart 125 VMS1T 2T AC '84-'85 not in series
VESPA PK125 N NUOVO (FL) 125 VMX7T 2T AC '90-'91 not in series
VESPA PK125 S / Elestart 125 VMX5T 2T AC '82-'84 not in series
VESPA PK125 XL / Elestart 125 VMX6T 2T AC '86-'90 not in series
VESPA PK125 XL2 125 VMX6T 2T AC '90- not in series

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