Akrapovič Slip-On Exhaust System Installation Instructions for Vespa GTS 125 Models

Introduction

Congratulations on purchasing the Akrapovič product. The Akrapovič product is made by Akrapovič d.d., Malo Hudo 8a, 1295 Ivančna Gorica, Slovenia (“Akrapovič”).

Please read this entire installation manual carefully prior to installing and using the Akrapovič product.

Akrapovič products should only be installed by persons skilled in motorcycle exhaust system or other motorcycle parts installation and performance. The instructions provided in this manual should be followed to ensure proper installation and safe use of the Akrapovič product. Akrapovič and/or its partners shall not be held liable for any damage or personal injury (including direct, indirect, or consequential damage) sustained as a result of improper installation of the Akrapovič product or its use and maintenance contrary to the instructions and warnings contained herein.

If you have any questions regarding the installation and/or proper use of the Akrapovič product or this manual, please contact your local Akrapovič partner.

For more information on the Akrapovič product, see the official Akrapovič website at: http://www.akrapovic.com

General Information

Your safety is our number one priority. Please ride your motorcycle responsibly, safely and always obey local traffic rules.

All statements made with regard to the product's compliance are made in respect of the product "as is". Any modifications of the Akrapovič product or its improper installation, use or maintenance that is not in accordance with this Installation manual, may result in severe damage to the product and/or motorcycle, as well as personal injury, and may affect the product's compliance with the legal requirements, such as product's air and/or noise emissions (as an example, the motorcycle may not be suitable for use on public roads any longer), as well as warranty coverage.

The product may only be used in accordance with relevant laws and regulations, including state and federal, where applicable.

Damage caused by improper installation, use and maintenance of the Akrapovič product is not covered by the Akrapovič warranty. Please refer to the enclosed warranty with regard to the terms of our warranty.

Technical specifications of Akrapovič products are subject to change without notice.

Copyright and Other Rights Notice

The Akrapovič trademark, including corporate logos and emblems, are subject to copyright as well as trademark rights of Akrapovič, its licensors, or third persons authorizing Akrapovič to use them.

Any reproduction, technical or other manipulation, translation, or other use of the copyright and/or trademark rights contained herein is prohibited without the explicit prior written consent of Akrapovič. The same especially applies to the entire contents of this manual and/or any of its parts, including but not limited to technical specifications, instructions, graphs, photographs, and so on included in this manual.

The shape of the Akrapovič product is protected under a registered Community Design No. REUD 015099249-0001.

Akrapovič takes all copyright and other rights infringement cases under serious consideration. If you have any reason to believe that your product is not an original Akrapovič product, please contact our local partners or Akrapovič at info@akrapovic.com.

Safety and Compliance Warnings

Please read carefully before removing stock parts and beginning installation:

• This manual is specific to the motorcycle indicated on the cover page. Installation procedures vary depending on the motorcycle type. Verify that the Akrapovič product and this manual correspond to your motorcycle type.
• For exhaust systems: The exhaust system can get extremely hot. Ensure it is completely cool before touching. Allow the exhaust and engine to cool down before beginning installation or any other work.
• Ensure the motorcycle is securely positioned to prevent tipping over and damage.
• Check received parts against the parts list available on the Akrapovič website (look for "Schematic View" on the respective product page). If any parts are missing, do not proceed and contact the retailer.
• Always check your motorcycle's ground clearance. For advanced users, check motorcycle spring preload settings to optimize ground clearance.
• For exhaust systems: Each muffler has a unique serial number for authenticity, found on the muffler's inlet pipe. Verify your exhaust system is an original Akrapovič product. Contact your reseller or Akrapovič partners if in doubt. This manual, certificates, and warranty apply only to original products.

Examples of Serial Number Position: The serial number is located on the muffler's inlet pipe.

Noise and Emission Warnings

General Warning: Akrapovič d.d. and its subsidiaries make no representation that products comply with air/noise emissions laws or labeling laws of any jurisdiction. Purchasers are responsible for informing themselves of and complying with applicable laws.

Basic guidance on compliance can be found on the Akrapovič website. For EC and ECE type approvals, refer to the enclosed certificate.

USA Warning: Individual U.S. states and the federal government have laws regulating aftermarket parts that modify, remove, or replace original equipment catalysts. Consult local laws before installation to ensure compliance. Akrapovič d.d. and its subsidiaries make no representation that their parts comply with such laws.

California Warning: California law prohibits aftermarket parts that modify, remove, or replace original catalysts unless an Executive Order has been issued or the part is used only on racing vehicles on closed courses. Purchasers are responsible for informing themselves of and complying with applicable California laws.

General Note

Photographs and illustrations in this manual are symbolic and intended to aid in representing installation steps and providing a general overview. Actual component parts may not entirely correspond to the illustrations.

Symbols

The following symbols are used throughout these installation instructions:

• ?? Tools and Protective Equipment Required
• ? Lubrication
• ? Tightening Torque
• ?️ Hand Tighten
• ? Installation Tip
• ❗ Caution or Important

Use Bolt Sealant: Apply 3 to 4 small drops of bolt sealant onto cleaned and degreased threads before tightening bolts.

WARNING! Avoid contact with skin, eyes, and mucous membranes. Do not inhale fumes. Keep out of reach of children.

Use Anti-Seize Lead-Free Copper Paste (black tube): Provides trouble-free and long-lasting protection against seizing, corrosion, and rusting of bolts, threaded ends, nuts, joints, etc. Also protects against vibration, wear, and impact.

WARNING! Avoid eye contact. Keep out of reach of children.

Use Anti-Seizing Grease (white tube): Prevents seizing, corrosion, and excessive wear between titanium components.

WARNING! Avoid eye contact. Keep out of reach of children.

Tools & Equipment

• Mechanic gloves ?
• Torx 40 wrench
• Torx 45 wrench
• Oxygen Sensor socket 17
• Combination 17 mm wrench

Parts List

The packaging box should contain one or more of the following items:

• Akrapovič product
• Homologation certificate/compliance documents (if applicable)
• Warranty
• Fitting material
• Installation Manual

A detailed list of parts can be found on the Akrapovič website (use the QR code on the front page or look for "Schematic view" on the respective product page).

Removal of Stock Exhaust System or Other Stock Motorcycle Parts

The process of uninstalling the original exhaust system or other motorcycle parts may vary depending on the existing system. Please follow the motorcycle manufacturer's workshop manual for uninstalling original parts.

If you decide otherwise, please note that any information provided herein is general information for convenience only. Akrapovič shall not assume any liability or responsibility regarding uninstalling your existing exhaust system or other parts, warranty coverage of such parts, or their further fitness for use.

In case your Akrapovič exhaust system or other motorcycle parts may not be used on certain roads or under certain conditions, please keep the stock (or other) exhaust system or other stock parts that you can use legally in such circumstances.

Step 1: Prepare the Motorcycle

Put the motorcycle on a central racing stand. Make sure the surface is solid and flat.

Step 2: Disconnect Lambda Sensor

Unplug the marked lambda sensor's connector. (Refer to Figure F 01: Image shows the lambda sensor connector with its wiring harness).

[IMPORTANT] Make sure not to damage the lambda sensor's electrical lead during this procedure!

[CAUTION] Be careful not to injure yourself or damage any part of the motorcycle during this procedure!

Step 3: Remove Stock Muffler

Loosen the marked clamp, unscrew the marked bolts, and carefully remove the stock muffler from the motorcycle. (Refer to Figure F 02: Image shows the rear wheel area with the stock muffler attached by clamps and bolts, indicated by yellow arrows).

[CAUTION] Be careful not to injure yourself or damage any part of the motorcycle during this procedure!

Step 4: Remove Lambda Sensor from Muffler

Unscrew the marked lambda sensor from the stock muffler. (Refer to Figure F 03: Image shows the lambda sensor being unscrewed from the stock muffler's connection point).

[IMPORTANT] Make sure not to damage the lambda sensor's electrical lead during this procedure!

Installation of the Akrapovič Exhaust System

Step 1: Install Gasket and Clamp

Install the graphite gasket and clamp onto the muffler's inlet, as shown. (Refer to Figure F 04: Image shows the Akrapovič muffler inlet with a graphite gasket being fitted, and a clamp ready to be applied).

Step 2: Install Lambda Sensor

Install and tighten the lambda sensor into the Akrapovič muffler, as shown. Torque specification: 34 Nm / 25 ftlb. (Refer to Figure F 05: Image shows the lambda sensor being screwed into the Akrapovič muffler, with a torque indicator showing 34 Nm / 25 ftlb).

[IMPORTANT] Make sure not to damage the lambda sensor's electrical lead during this procedure!

[CAUTION] Be careful not to injure yourself or damage any part of the exhaust system during this procedure!

Step 3: Mount Muffler and Tighten Brackets

Correctly install the Akrapovič muffler onto the motorcycle and tighten the brackets to the specified torque using bolts, washers, and spacer bush from the Akrapovič installation kit, as shown. (Refer to Figure F 06: Image shows the Akrapovič muffler positioned on the motorcycle, with bolts M8x30 and M8x20, washers, and a spacer bush indicated).

[IMPORTANT] Use bolt sealant on marked bolt threads!

[CAUTION] Be careful not to injure yourself or damage any part of the motorcycle during this procedure!

(Refer to Figure F 07: Image shows a close-up of the bracket being tightened with a torque wrench, indicating 22 Nm / 16 ftlb, and the spacer bush).

Step 4: Tighten Clamp

Tighten the clamp to the specified torque. Torque specification: 14 Nm / 10 ftlb. (Refer to Figure F 08: Image shows the clamp connecting the muffler to the exhaust pipe, with a torque indicator showing 14 Nm / 10 ftlb).

[CAUTION] Be careful not to injure yourself or damage any part of the exhaust system during this procedure!

Step 5: Reconnect Lambda Sensor

Reconnect the marked lambda sensor's connector. (Refer to Figure F 09: Image shows the lambda sensor connector being plugged back into its socket).

[IMPORTANT] Make sure not to damage the lambda sensor's electrical lead during this procedure!

[CAUTION] Be careful not to injure yourself or damage any part of the motorcycle during this procedure!

Final Installation

1. If any component is equipped with a DMC code sticker, remove the sticker and glue residue from the component before first use.
2. Clean grease spots off all Akrapovič product surfaces after installation is finished. Cleaning prevents spots from burning onto the surface. Do not use aggressive chemical cleaners, as they can damage surfaces or stickers.
   • Titanium surfaces (muffler outer sleeve, pipes): Use a soft cloth sprayed with a multi-purpose spray lubricant (e.g., WD-40®), then wipe with a soft dry cloth.
   • Carbon-fiber surfaces (outlet cap, muffler outer sleeve, bracket): Use a soft dry cloth sprayed with all-purpose foam cleaner, then wipe with a soft dry cloth.
   • Painted surfaces (outlet cap, muffler outer sleeve, bracket): Use a soft cloth sprayed with all-purpose foam cleaner, then wipe with a soft dry cloth.
   • Chrome plated surfaces (outlet cap, muffler outer sleeve): Use a soft cloth sprayed with all-purpose foam cleaner, then wipe with a soft dry cloth.
   • Stainless steel surfaces (muffler outer sleeve, pipes): Use a soft cloth sprayed with a contact cleaner, then wipe with a soft dry cloth.

   *WD-40® is a trademark of the WD-40 Company.

3. Ensure all nuts and bolts are sufficiently tightened. If the Akrapovič product touches the cowling or other parts, adjust the product or contact your authorized dealer.
4. Reinstall all dismounted or partially removed stock parts (cowlings, radiator, etc.). Refer to the vehicle manufacturer's workshop manual for correct procedures and tightening torques.

Maintenance of the Akrapovič Product

• [IMPORTANT] Periodically check that all bolts and springs are sufficiently tightened. If the product touches the cowling or other parts, adjust the product or contact your authorized dealer.
• [CAUTION] After running the engine for 30 minutes, retighten the bolts of the Akrapovič carbon-fiber heat shield.
• [IMPORTANT] It is normal for white smoke to come out of the muffler during the first 100 km after replacement.
• [IMPORTANT] A change in the exhaust system's color is normal due to high temperatures.
• [CAUTION] Do not stand behind the muffler at any time.
• [IMPORTANT] Do not use automotive wheel cleaners or cleaning products containing acidic additives to clean Akrapovič products.
• [IMPORTANT] Use high caution when using a power/pressure washer for cleaning painted/lacquered surfaces of Akrapovič products to avoid paint/lacquer damage.
• [IMPORTANT] All Akrapovič products are developed and designed for specific vehicles for their entire expected lifetime. Please ensure that end-of-life Akrapovič products are disassembled into components as shown in the product's schematic diagram available on the Akrapovič website, and each component is scrapped responsibly and according to applicable local laws and regulations. Akrapovič does not assume any obligation or responsibility with respect to the scrapping process or providing information related thereto.

[IMPORTANT] In case of contamination with gasoline, all painted/lacquered surfaces of Akrapovič components must be wiped with a soft, absorbent cloth immediately!

Troubleshooting