SIP PERFORMANCE Racing Cylinder with 199 ccm, 60 mm stroke, and three-piece exhaust for Vespa T5 models—designed for high-torque street engines and performance-oriented tuning setups.
The Vespa T5 engine is considered one of the most technically interesting classic Vespa engines with a manual transmission. Large transfer ports and the wide Crankshaft provide a solid foundation for performance upgrades. The SIP PERFORMANCE 199 makes full use of the available installation space and brings the T5 engine, with a 65 mm bore and 60 mm stroke, up to 199 ccm.
- 199 ccm for significantly more torque and power
- Three-piece exhaust for high gas flow and further tuning potential
- Plug-and-play on the original T5 overflow ports
- Bolt-on exhaust flange for various exhaust configurations
The goal during development was to create a Cylinder that, even as a plug-and-play setup, delivers powerful yet practical performance for everyday driving while offering sufficient headroom for further modifications.
199 cc with a 65 mm bore and 60 mm stroke
The original Vespa T5 has a displacement of 125 ccm. However, the available installation space allows for significantly more. With a 65 mm bore and 60 mm stroke, the SIP PERFORMANCE cylinder achieves 199 ccm.
Operation requires a crankshaft with a 60 mm stroke and 115 mm connecting rod length. This combination makes full use of the available installation space without requiring the crankcase to be bored out for additional stroke.
Five transfer ports
The cylinder features a 5-channel overflow system. The channel layout is designed so that the cylinder functions using the original overflow channels of the T5 crankcase.
At the same time, the transitions to the crankcase provide room for further machining. Optionally, the web between the transfer ports in the original T5 crankcase can also be removed.
Three-part exhaust
The outlet consists of a large central outlet channel and two lateral secondary outlets. The secondary outlets run inside the cylinder studs.
The channel shape was developed on the test bench to ensure that the side outlets also have sufficient cross-sectional area.
Bolt-On Exhaust Flange
The original T5 exhaust is designed for the standard 125-cc engine. For the SIP PERFORMANCE cylinder, the exhaust flange is therefore fitted with a fitting.
A flange for T5 exhaust systems is included as standard. It is secured with two screws, sealed with an O-Ring, and also features seating for exhaust springs.
For larger manifold diameters, the Flange can be replaced with a different version. Additional threads on a larger radius are available for this purpose.
Crankshaft with 60 mm stroke and 115 mm Conrod
The cylinder is designed for a crankshaft with a 60 mm stroke and a 115 mm conrod length. The original T5 conrod measures 105 mm.
The longer Conrod is better suited to the increased stroke and promotes smoother engine operation. When installing into original crankcases, some clearance must be created at the upper edges of the crankcase for the Conrod. This can be done, for example, with a Dremel.
Piston and Cylinder Head
The 65-mm piston features two 1-mm-thick steel piston rings and a biconical Gudgeon Pin.
As is typical for the T5, the Cylinder Head features a centrally located Spark Plug. The squared area accounts for 47% of the piston area. The combustion chamber extends into the cylinder, ensuring precise centering.
The original Centring Bush can still be used, but is not required in a plug-and-play setup.
The cylinder and head are designed so that the original rubber Vibration Damper elements can be installed.
Cooling Hood and Cylinder Cowling
The cylinder can be used with the original T5 Cooling Hood. However, due to the 10 mm longer Conrod, the Cylinder Cowling must be spaced accordingly.
The easiest way to do this is with a Cover Sheet between the Flywheel Cover and the Cylinder Cowling.
Longer cylinder studs are also recommended, such as part no. PI829375.
Technical Details
- Coated aluminum cylinder
- Bore: 65 mm
- Stroke: 60 mm
- Displacement: 199 ccm
- 5 overflow channels
- 3 exhaust ports
- Bolted exhaust flange
- O-Ring seal at the outlet
- Self-centering Cylinder Head
- 2 × 1 mm steel piston rings
- Valve timing: 122° / 180° / 29°
- Recommended squish gap: 1.45–1.6 mm
- Recommended Spark Plug: NGK B8ES
- Recommended ignition timing: 18°
Scope of delivery
- Aluminum cylinder with coated running surface
- Cylinder Head with centering
- Piston, Ø 65 mm
- 2 × 1 mm steel piston rings
- Exhaust flange with Fitting and O-Ring
- 2 cylinder head gaskets, 0.2 and 0.5 mm thick
Conclusion: The SIP PERFORMANCE 199 makes full use of the available installation space in the T5 engine and offers a versatile foundation ranging from a powerful touring setup to performance-oriented tuning.
These products are a perfect fit – SIP TIPS:
Quote from the press:
“The (SIP) 199 kit is better in every respect—and significantly so. At 7,000 rpm, it delivers 4 PS more, which corresponds to an increase of about 28.5%. That’s enormous, and unlike conventional 2-stroke tuning measures, where you’d expect a compromise somewhere in the RPM range, there isn’t one here. It’s simply better.”
– Martin “Sticky” Round, review on scooterlab.uk
