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WebshopVespa Smal...Spare Part...Gear Box -...Primary Driven Gear 26 (26/69
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Primary Driven Gear 26 (26/69

-2.65) teeth, DRT for Vespa
50-125/PV/ET3/PK50-125/S/XL
/XL2,
fits also for Surflex
Ø 44 mm, straight teeth, for
primary 27-69

The replacement of the primary drive cog on the crankshaft of the small frame motor is one of the most simple and effective methods to alter the overall gear ratio of your motor. The key to precise gear ratio tuning are cogs with straight cut teeth. Due to the extensive range of cog sizes (or number of teeth) you can have the exact overall gear ratio required for your motors particular state of tune.

 

The DRT gear cog teeth are precisely manufactured from an especially tough grade of steel and then hardened. They are CNC machined from solid steel and are then put through an extra milling process to remove any unnecessary material and so save as much weight as possible.

 

The 24/72 - 3.00 sized primary drive/clutch basket has proved suitable for tuning cylinder set ups between 75 - 102cc. The gear cogs produced by DRT in the cog teeth sizes 21,22 and 23 fill the gaps in the overall gear ratios for smaller 75 - 85cc cylindered machines. These items are CNC machined from solid steel and then remilled to remove any excess material, to save weight. The gear cogs with 24, 25, 26 and 28 cog teeth are usually the preferred sizes in both circuit and sprint racing in combination with the input shafts produced by DRT. Their MATRIX or SINCRO versions also have their own particular recommended gear cog sizes. The cog with 26 teeth has proven its worth when used with the more moderately tuned, road-going VESPA motor projects with a cylinder capacity of between 125 and 130cc. The 27/69 primary drive gear cog ratio, in all its variations, is the most commonly used when tuning motors with a cylinder capacity of between 130 and 155cc.

 

The 29/68 primary drive gear cog ratio is usually the best option for high-end performance orientated projects.

It can also be used in the more mildly tuned engine set ups in combination with 26 or 27 teeth gear cogs, making for higher speeds at lower engine rpm. For all you ultimate top-end speed freaks we have a gear cog available with 30 teeth which raises the overall gear ratio of your motor to 2.27!

 

We have the full details of which overall gear ratios work well with which cylinder classes available for download at our website.

 

SIP-TIP: These primary drive cogs are best combined with the primary drive transmission units that we also have available produced by RMS, OLYMPIA, SURFLEX or POLINI. Do not forget to also order new shaft-end fixing nuts and safety washers, the relevant woodruff keys, clutch friction plates and fresh gearbox oil for safe and enduring use of your motor.


OEM Numbers (for the purpose of comparison)  ip S125 z26.165 (z69) PIGN (DRT)


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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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