AKRAPOVIC CB750 HORNET Winning Exhaust System Instruction Manual

: June 16, 2024
: akrapovic

Table of Contents

AKRAPOVIC CB750 HORNET Winning Exhaust System
Product Information
GENERAL INFORMATION
SAFETY AND COMPLIANCE WARNING, PLEASE READ CAREFULLY
NOISE AND EMISSION WARNINGS
PARTS LIST
INSTALLATION
FINAL INSTALLATION
MAINTENANCE OF THE AKRAPOVIČ PRODUCT:
TROUBLESHOOTING
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

AKRAPOVIC CB750 HORNET Winning Exhaust System

Product Information

Specifications

Product: Optional Header for the Honda CB750 HORNET
Product Code: 509216
Manufacturer: Akrapovic d.d.
Address: Malo Hudo 8a, 1295 Ivancna Gorica, Slovenia
Revision: 1.0
Date: October 2023

Congratulations on purchasing the Akrapovic product. The Akrapovic product is made by Akrapovic d.d., a manufacturer based in Slovenia. Please read the following installation manual carefully before installing and using the Akrapovic product.

Installation Instructions
To ensure proper installation and use of the Akrapovic product, please follow these steps:

Make sure to have all the necessary tools and equipment before starting the installation.
Refer to your motorcycle’s user manual for instructions on removing the stock header.
Position the Akrapovic Optional Header for Honda CB750 HORNET in place of the stock header.
Secure the Akrapovic Optional Header using the provided mounting brackets and hardware.
Tighten all bolts and screws to the recommended torque specifications mentioned in the user manual.
Double-check all connections and ensure everything is properly aligned.
Start your motorcycle and listen for any unusual noises or vibrations. If detected, stop the engine and recheck the installation.

If you encounter any difficulties during the installation process or have any questions, please contact your local Akrapovic partner for assistance.

General Information
Your safety is of utmost importance. Always ride your motorcycle responsibly, adhere to local traffic rules, and prioritize safety. The Akrapovic product should only be used in compliance with relevant laws and regulations, including state and federal regulations where applicable. Any damage caused by improper installation, use, or maintenance of the Akrapovic product will not be covered by the Akrapovic warranty. Please refer to the enclosed warranty for detailed terms and conditions. Technical specifications of Akrapovic products are subject to change without prior notice.

Copyright and Other Rights Notice

The Akrapovic trademark, including corporate logos and emblems, is protected by copyright and trademark rights. Any unauthorized reproduction, manipulation, translation, or use of the trademark rights and copyrighted content in this manual is strictly prohibited without explicit written consent from Akrapovic.
The shape of the Akrapovic product is also protected under a registered Community Design.
Akrapovic takes copyright and other rights infringement cases seriously. If you suspect that your product is not an original Akrapovic product, please contact our local partners or email info@akrapovic.com.

Noise and Emission Warnings
Due to the global distribution of Akrapovic products, it is the responsibility of the purchasers to ensure compliance with air and noise emissions laws and labeling laws in their respective jurisdictions. To determine the legal compliance of your Akrapovic product in a specific country, please refer to the product-related section on the official Akrapovic website (www.akrapovic.com) or use the QR code provided on the front page of this manual. For EC and ECE type approvals, please consult the certificate enclosed with your product.

Serial Number Position
The serial number of your Akrapovic product can be found in the following format:1 YYWWPXXXXX

FAQ

Q: Where can I find more information about the Akrapovic product?
A: For more information, please visit the official Akrapovic website at http://www.akrapovic.com.
Q: What should I do if I encounter difficulties during the installation process?
A: If you face any difficulties or have questions, please contact your local Akrapovic partner for assistance.
Q: Is the Akrapovic product covered by a warranty?
A: Yes, the Akrapovic product is covered by a warranty. Please refer to the enclosed warranty for detailed terms and conditions.
Q: How can I determine if my product is an original Akrapovic product?
A: If you suspect that your product is not an original Akrapovic product, please contact our local partners or email info@akrapovic.com for further assistance.
Q: Are there any noise and emission warnings associated with the Akrapovic product?
A: Yes, please refer to the “Noise and Emission Warnings” section of this manual for important information regarding compliance with air and noise emissions laws.

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 product 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 by 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 by 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 about 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. RCD 002747246-001. 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 WARNING, PLEASE READ CAREFULLY

BEFORE REMOVING THE STOCK PARTS AND BEGINNING THE INSTALLATION OF YOUR NEW AKRAPOVIČ PRODUCT, PLEASE MAKE SURE THAT ALL ITEMS LISTED BELOW ARE VERIFIED:

THIS MANUAL IS SPECIFIC TO THE MOTORCYCLE INDICATED ON THE COVER PAGE, FOR WHICH IT IS DESIGNED. INSTALLATION PROCEDURES VARY DEPENDING ON THE TYPE OF MOTORCYCLE. PLEASE VERIFY THAT THE AKRAPOVIČ PRODUCT AND THIS INSTALLATION MANUAL CORRESPOND TO THE TYPE OF YOUR MOTORCYCLE.
FOR EXHAUST SYSTEM ONLY: THE EXHAUST SYSTEM CAN GET EXTREMELY HOT DURING AND AFTER IT IS USED. MAKE SURE NOT TO TOUCH THE EXHAUST SYSTEM UNTIL IT IS COMPLETELY COOL. ALLOW THE EXHAUST AND ENGINE TO COOL DOWN BEFORE BEGINNING INSTALLATION OR ANY OTHER WORK ON THE MOTORCYCLE.
MAKE SURE THE MOTORCYCLE IS SECURELY POSITIONED TO PREVENT TIPPING OVER AND DAMAGE TO YOURSELF AND OTHERS, OR THE MOTORCYCLE.
PLEASE CHECK THE PARTS YOU RECEIVED AGAINST THE PARTS LIST AVAILABLE ON OUR WEBSITE (PLEASE USE THE QR CODE ON THE FRONT PAGE OR LOOK FOR “SCHEMATIC VIEW” IN THE RESPECTIVE PRODUCT PAGE ON WWW.AKRAPOVIC.COM). MAKE SURE THAT YOU HAVE ALL THE PARTS NECESSARY FOR THE INSTALLATION OF YOUR NEW AKRAPOVIČ PRODUCT. IF ANY OF THE PARTS IS MISSING, PLEASE DO NOT PROCEED WITH UNINSTALLING YOUR STOCK PARTS/ INSTALLING THE AKRAPOVIČ PRODUCT AND CONTACT THE RETAILER WHERE YOU PURCHASED THE AKRAPOVIČ PRODUCT.
ALWAYS CHECK YOUR MOTORCYCLE’S GROUND CLEARANCE. FOR ADVANCED USERS, WE RECOMMEND YOU CHECK THE MOTORCYCLE SPRING PRELOAD SETTINGS TO OPTIMIZE GROUND CLEARANCE WHERE POSSIBLE.
FOR EXHAUST SYSTEM ONLY: EVERY EXHAUST SYSTEM MUFFLER HAS ITS UNIQUE SERIAL NUMBER, WHICH IDENTIFIES THE AUTHENTICITY OF THE PRODUCT. YOU CAN FIND THE SERIAL NUMBER ON THE MUFFLER’S INLET PIPE. PLEASE REFER TO THE PICTURE BELOW. PLEASE VERIFY THAT YOUR EXHAUST SYSTEM IS AN ORIGINAL AKRAPOVIČ PRODUCT. IF YOU HAVE ANY DOUBTS, PLEASE CONTACT THE RESELLER WHERE YOU PURCHASED THE EXHAUST SYSTEM OR AKRAPOVIČ PARTNERS. THIS MANUAL, ANY CERTIFICATES AND AKRAPOVIČ WARRANTY APPLY TO ORIGINAL PRODUCTS ONLY.

NOISE AND EMISSION WARNINGS

General warning
Because of the world-wide distribution of Akrapovič d.d. products, neither Akrapovič d.d. nor any of its subsidiaries make any representation that the products comply with the air and/or noise emissions laws, or labeling laws, of any jurisdiction. The purchasers are entirely responsible for informing themselves of the applicable laws where the products are to be used and to comply with those law. Although legal compliance of Akrapovič products in a specific country should be determined by the user, you can find some basic guidance on compliance of your Akrapovič product with various legal requirements on the product-related part of our website (please use the QR code on the front page or look for the respective product page on www. akrapovic.com). For EC and ECE type approvals, please refer to the certificate enclosed to your product.

USA WARNING
Various U.S. states and the U.S. federal government have individual laws regulating the use of aftermarket parts and systems, especially as those parts and systems modify, remove, or replace original equipment catalysts. Please consult the appropriate laws in your area before installing any aftermarket part or system on your vehicle to ensure compliance with all applicable laws. Neither Akrapovic d.d. nor any of their subsidiaries or the sellers of the parts or systems make any representation that any of their parts or systems comply with any such laws.

CALIFORNIA WARNING
California laws prohibit the use of any aftermarket part or system that modifies, removes or replaces original equipment catalysts unless the California Air Resources Board has issued an Executive Order regarding such part or system or unless the part or system is exempted by being used only on racing vehicles on closed courses. Neither Akrapovic d.d. nor any of their subsidiaries make any representation that any of their parts or systems has received such an Executive Order or that any of their parts or systems conform with the racing vehicles exemption. The purchasers are entirely responsible for informing themselves of applicable California laws and to comply with those laws.

GENERAL NOTE
Photographs and other illustrations in this manual are symbolic and are intended to help represent individual steps for proper installation and use, as well as for a general overview. The actual component parts of the Akrapovič product may not entirely correspond to the photographs and other illustrations.

SYMBOLS
The following symbols are used throughout these installation instructions:

Tools & equipment

Mechanic gloves
T-handle 12 mm wrench
Ratchet combination 12 mm wrench
Torx 40 wrench
Torx 45 wrench
Combination 13 mm wrench
Combination 17 mm wrench
Small flat screwdriver
Socket 8
Pliers
Spring puller

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

Detailed list of parts can be found on the Akrapovič website (please use the QR code on the front page or look for “Schematic view” in the respective product page on www.akrapovic.com).

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 exhaust system or other motorcycle parts. Please follow the motorcycle manufacturer’s workshop manual for uninstalling the original exhaust system or other motorcycle parts. If you for any reason decide otherwise, please note that any information provided in this respect herein should be considered as general information provided for your convenience only. Akrapovič shall not assume any liability or responsibility with regard to uninstalling your existing exhaust system or other parts of the motorcycle, warranty coverage of such exhaust system or other motorcycle parts vehicle 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 in such circumstances legally.

INSTALLATION

REMOVAL OF STOCK EXHAUST SYSTEM:

Put the motorcycle on a side stand, we recommend a central racing stand. Make sure, that surface is solid and ﬂat.
Loosen the marked clamp, unhook the spring and unscrew muffler’s bracket bolt than carefully remove the muffler off the motorcycle (F 01, 02).
CAUTION: be careful not to injure yourself or damage any part of the motorcycle during this procedure!
Unscrew marked lambda sensor out off the exhaust system (F 03).
IMPORTANT: make sure not to damage the lambda sensors’ electrical lead during this process!
Unscrew all headers’ ﬂange nuts, marked bracket bolt and carefully remove the stock header off the motorcycle (F 04, 05).
CAUTION: be careful not to injure the radiator or any other part of the motorcycle during this process
!IMPORTANT: support the exhaust during this process!
Unhook marked lambda sensor’s fastener out off the bracket (F 06).
IMPORTANT: make sure not to damage the lambda sensors’ electrical lead during this process!
Try to loosen or use new OEM cable fastener, to get some more slack on the lambda sensors’ electrical lead (F 07).
IMPORTANT: make sure not to damage the lambda sensors’ electrical lead during this process!
Unscrew marked bolts and reposition the cable fasteners’ bracket as shown, than tighten the bolts. Check motorcycle manufacturer workshop manual for correct tightening torque (F 08, 09).
CAUTION: be careful not to injure yourself or damage any part of the motorcycle during this procedure!

INSTALLATION OF THE AKRAPOVIČ OPTIONAL HEADER:

Set up and hand tighten the ﬂanges together with the springs and sleeves onto the cylinder head, using stock nuts; make sure you orient the ﬂanges and springs, as shown (F 10, 11).
IMPORTANT: do not fully tighten the flanges yet!
INSTALLATION TIP: use new stock exhaust port gaskets.
Insert the headers into the link pipe, as shown and attach the springs (F 12).
CAUTION: be careful not to injure yourself during this procedure!
IMPORTANT: make sure, that springs pull the header tubes all the way into the link pipe – use rubber mallet if necessary to tap the connections into place!
Assemble the aluminium bushes from Akrapovič installation kit into the rubber link pipe’s bracket, as shown (F 13).
CAUTION: be careful not to injure yourself or damage any part of the exhaust during this procedure!
Insert the headers into the sleeves and attach the springs,hand tighten the link pipe’s bracket onto the motorcycle sing bolt and washer from Akrapovič installation kit (F 14, 15).
IMPORTANT: make sure, that springs pull the header tubes all the way into the sleeves – use rubber mallet if necessary to tap the connections into place!
IMPORTANT: be careful not to damage the radiator or any other part of the motorcycle during this process!
Install the lambda sensor into the link pipe and tighten it to the specified torque (F 16).
IMPORTANT: make sure not to damage the lambda sensors’ electrical lead during this process!
Hook and tighten the cable fasteners, as shown (F 17, 18).
IMPORTANT: make sure not to damage the lambda sensors’ electrical lead during this process!
Position the muffler correctly, slide it onto the link pipe attach the spring and tighten the muffler’s bracket and clamp to the specified torques (F 19, 20).
CAUTION: be careful not to injure yourself or damage any part of the motorcycle during this procedure!
Tighten the link pipe’s bracket to the specified torque (F 21).
CAUTION: be careful not to injure yourself or damage any part of the motorcycle during this procedure!
Tighten the header’s ﬂanges nuts to the specified torque (F 22).
IMPORTANT: be careful not to damage the radiator or any other part of the motorcycle during this process!

FINAL INSTALLATION

Clean grease spots off all Akrapovič product’s surfaces, when installation is finished. Cleaning will prevent spots from burning onto the surface. Do not use aggressive chemical cleaners, because they can damage the surface or stickers:
- Titanium surfaces (titanium muffler’s outer sleeve, titanium pipes etc): use a soft cloth sprayed with a multi-purpose spray lubricant (WD-40® or equivalent)*, then wipe with a soft dry cloth.
- Carbon-fiber surfaces (carbon-fibre outlet cap, carbon-fibre muffler’s outer sleeve, carbon-fibre bracket etc): use a soft dry cloth sprayed with all-purpose foam cleaner, then wipe with a soft dry cloth.
- Painted surfaces (painted outlet cap, painted muffler’s outer sleeve, painted bracket etc): use a soft cloth sprayed with all-purpose foam cleaner, then wipe with a soft dry cloth.
- Chrome-plated surfaces (chrome-plated outlet cap, chrome-plated muffler’s outer sleeve etc): use a soft cloth sprayed with all-purpose foam cleaner, then wipe with a soft dry cloth.
- Stainless steel surfaces (stainless steel muffler’s outer sleeve, stainless steel pipes etc): 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.
Make sure all the nuts and bolts are sufficiently tightened. In case the Akrapovič product touches the cowling or other parts, repeat the adjustment of the product or contact your authorized dealer.
Reinstall all dismounted or partially removed stock parts (cowlings, radiator etc); check the vehicle manufacturer’s workshop manual for correct procedures and tightening torques.

MAINTENANCE OF THE AKRAPOVIČ PRODUCT:

IMPORTANT: periodically make sure all the bolts and springs are sufficiently tightened. In case the product touches the cowling or other parts repeat the adjustment of the product or contact your authorized dealer!
CAUTION: after running engine for 30 minutes, retighten the bolts of the Akrapovič carbon-fibre heat shield!
IMPORTANT: IT IS NORMAL IF WHITE SMOKE COMES OUT OF THE MUFFLER DURING THE FIRST 100 KM AFTER REPLACEMENT.
IMPORTANT: A CHANGE IN THE COLOR OF THE EXHAUST SYSTEM IS NORMAL DUE TO THE HIGH TEMPERATURES.
CAUTION: DO NOT STAND BEHIND THE MUFFLER AT ANY TIME.
IMPORTANT: DO NOT USE AUTOMOTIVE WHEEL CLEANERS OR ANY CLEANING PRODUCTS THAT CONTAIN ACIDIC ADDITIVES TO CLEAN AKRAPOVIČ PRODUCTS.
IMPORTANT: WE RECOMMEND HIGH CAUTION WHEN USING POWER / PRESSURE WASHER FOR CLEANING PAINTED / LACQUERED SURFACES OF THE AKRAPOVIČ PRODUCTS, TO AVOID PAINT / LACQUER DAMAGE.
IMPORTANT: ALL AKRAPOVIČ PRODUCTS ARE DEVELOPED AND DESIGNED TO BE USED ON SPECIFIC VEHICLES, FOR THEIR ENTIRE EXPECTED LIFETIME. PLEASE MAKE SURE THAT THE END-OF-LIFE AKRAPOVIČ PRODUCT IS DISASSEMBLED TO COMPONENTS 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.