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Product Image for 'Racing Cylinder D.R. by SIP 85 ccTitle'
Racing Cylinder D.R. by SIP 85 cc
for Vespa 50 1° Serie
Product No.: 10006100
Plus shipping
2,072kg / Piece
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Product Image for 'Racing Cylinder D.R. by SIP 85 ccTitle'
Product Image for 'Racing Cylinder D.R. by SIP 85 ccTitle'
Product Image for 'Racing Cylinder D.R. by SIP 85 ccTitle'
Product Image for 'Racing Cylinder D.R. by SIP 85 ccTitle'
Product Image for 'Racing Cylinder D.R. by SIP 85 ccTitle'
Product Image for 'Racing Cylinder D.R. by SIP 85 ccTitle'

Racing Cylinder D.R. by SIP 85 cc

for Vespa 50 1° Serie
  • cast iron
  • 3 ports
  • Ø 50,0mm
  • stroke 43mm
  • with cylinder head
  • cylinder base turned for V50 1° series
ROAD-TUNING, for everyday use & reliable
For race use only. Not admitted in the area of the German StVZO!

Product description

The APE belongs to Italy, like tuning to Vespa. Originally designed for the APE load-pulling trike, this DR cylinder also fits all 50cc Vespas.

This powerful cylinder is distinguished by an independent layout with squared outlet and more relaxed port timings. Torque from low revolutions, ideal for making good time on the road. With this cylinder, however, the transmission must be adjusted. The DR racing cylinder scores more with its torque and power from low down than with revs.

In addition, all DR cylinders are painted black for protection against corrosion and for better dissipation of heat. Anyone who would like a bit more can modify the outlet and give it a more trapezoid shape.

Conclusion: Ideal cylinder for relaxed cruising, high torque for 2-person use, suitable for long routes at full throttle. The primary should always be adjusted, however.


Cast iron/ 50mm bore/ 3 transfer ports/ 84.43cc

Cast iron cylinder, stroke 43mm, 3 transfer ports, pistons with 2 piston rings and plane piston head, rectangular exhaust with a width of 26mm (chord dimensions), 6mm exhaust studs, original DR cylinder head included in delivery, compression 10.7:1, incl. gasket set. Jets should be adjusted. Fits all Vespa 50/PK/XL/XL2 models, except PK automatic. Transfer ports match the originlas, casing must not be modified


SIP-TIP: Adjusting  the main jet and a new spark plug is a must. Altering the transmission is a must here, min. a 3.72 primary, max. 3.00. The engine can be made even sportier with 16/ 16 carburettor, original exhaust with a wider manifold or the SITO banana.


SIP-Community User “FelixV50Rundkopf“:

“Long-lasting cylinder which, in my opinion, drives best with a Dell'Orto 19.19, a 2.86 transmission. A 3.00 transmission is also okay, more air flow, but then at the final speed the cylinder is put under somewhat more strain than with the 2.86. I still have the chrome banana fitted.”

SERIE PRO also manufactures cylinders for Vespa 50 1° Serie V5A1T -> 92876. We've modified them so that they fit the first 50's Vespas with their smaller cylinder base connection in motor block.

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Gollenz ArminG November 11, 2020 45 View Notepad
Alt ArminG September 16, 2020 37 View Notepad

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Questions & Answers

Let us and the community help you! Here you can ask your questions about the product.


Filename File type Description File size
Montage_Polini130ccm Montage Zylinder Smallframe 8,43 MB Download
Technik_Zylinder Technik Zylinder Vespa 46,55 MB Download
Tuningübersicht Smallframe Tuningübersicht Smallframe 0,20 MB Download
DR85ccm_Datenblatt DR85ccm_Datenblatt.pdf 0,24 MB Download
Technik_Zylinderkopf Technik Zylinderkopf 0,38 MB Download
Cylinder head technology Cylinder head technology 1,60 MB Download
Cylinder technology Cylinder technology 6,14 MB Download
Mounting of a Vespa smallframe cylinder Mounting of a Vespa smallframe cylinder 0,39 MB Download
Smallframe cylinder assembly Smallframe cylinder assembly 0,44 MB Download
Tuning summary smallframe Tuning summary smallframe 1,87 MB Download

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