Yoshimura 221200B250 User manual

RESEARCH&DEVELOPMENT OF AMERICA, INC.
NOTE: IN THE STATE OF CALIFORNIA, IT IS ILLEGAL TO MODIFY THE EMISSION CONTROL SYSTEM, WHICH INCLUDES THE FUEL INJECTION OF ANY VEHICLE.
5420 DANIELS STREET STE A, CHINO CA 91710 · [phone] · [phone] · FAX [phone]
CAUTION: The muffler packing on this system MUST be replaced every 6-8
hours of use, or every 1-2 motos. Failure to follow recommended muffler
re-packing interval can cause muffler damage and may void the warranty.
221200B250 (CF/SS)
RS-2 Stainless Steel Full-System
Honda CRF125F
Qualified Manufacturer Declared “Replacement Part”
2014~2018
ENDURO SERIES
Enduro Series systems are:
• Equipped with USFS-approved spark arrestor.
• CARB/EPA tail-pipe emissions compliant.
• All applications are marked with appropriate EPA noise labels.
• Have not been tested for EPA new vehicle noise compliance.
www.yoshimura-rd.com

2
Assembly Diagram
No. Item Description Qty.
1 22120-101 Yoshimura Header 1
2 221200B250-RMA Yoshimura Muffler 1
3 2115-HS Yoshimura Heatshield 1
4 RC116HSB Heatshield Screws 2
5 RACE-SPS-1 Medium Spring 2
** ST-200 Spring Puller Tool 1
** 347PLUG Yoshimura Wash Plug 1
** 17029 Sticker Kit Sheet 1
5
** Not shown in diagram.
1
2
3
4
5

1. Remove the right side cover by removing the
two bolts and one plastic pop rivet located on
the inside front of the side cover.
2. Remove the two header nuts.
3. While securely supporting the stock muffler
assembly, remove the two muffler mount bolts
and carefully remove the stock muffler
assembly.
Note: The stock exhaust port gaskets will be
re-used. Inspect and replace if necessary.
Removal
Installation
1. Install (No. 1) 22120-101, Yoshimura header using
the stock header nuts. Do not torque at this time.
2. Install (No. 2) 221200B250, Yoshimura muffler
onto (No. 1) 22120-101, Yoshimura header.
Secure muffler to chassis using the stock muffler
mount bolt. Torque muffler mount bolt to factory
specification.
3. Install (No. 5) RACE-SPS-1, medium exhaust
springs onto muffler and header connection.
4. Torque header nuts to factory specification.
5. Install (No. 3) 2115-HS, Yoshimura heatshield
onto (No. 1) 22120-101, Yoshimura header using
(No. 4) RC116HSB, heatshield screws provided in
the kit.
6. Re-install right side cover using the reverse steps
of removal.
7. Before starting vehicle, check for proper
clearance between new exhaust system and
rear suspension (i.e. tire, control arm, brakes,
rear shock, and etc.) If any problem is found,
please carefully follow through the installation
steps again. If problem still persists, please call
Yoshimura Tech Department at [phone] /
in CA [phone].
8. It is recommended that the muffler and tailpipe
be wiped down with rubbing alcohol to remove
oil and fingerprints. This will help prevent
tarnishing of the finish after the exhaust is
heated up.
Note: After starting vehicle, it is normal for new
exhaust system and muffler to emit smoke
until oil residue burns off.
3
NO . DE S CRIPT ION Q TY
1 Alum inum Ring 1
2 Spark A rres ter 1
3 Spark A rres ter S ecuring Bolt 1
4 Muffler A s s embly 1
4
1
2
1. Using a 4mm Allen key, remove the bolt that
secures the aluminum ring and spark arrester to
the muffler (see Parts Diagram for location).
2. Remove the spark arrester from the muffler.
3. Using a wire brush, remove carbon deposits
from spark arrester screen. Inspect the screen
for excessive wear or damage. If spark arrester
is excessively worn or damaged, the spark
arrester must be replaced. Cleaning and
inspection should be performed after every 60
hours of use.
CAUTION: Gloves and safety glasses should be
worn while cleaning spark arrester.
4. Re-install spark arrester and aluminum ring.
Torque the spark arrester securing bolt to 1.0 kg-
m (7.3 lb-ft).
Note: It is recommended that a low strength,
high temperature thread-lock is used on
the spark arrester securing bolt.
Parts Diagram
Spark Arrestor Maintenance

Dear Yoshimura Customer,
Congratulations and thank you for purchasing a Yoshimura Exhaust System. Over six decades of experience in research
and development, state of the art machinery, materials and craftsmanship of the highest quality all come together in a
product of exceptional quality and performance—in other words, this is the best thing you can put on your bike.
We strive to provide you with a product perfect in fit and finish. However, if you have any problems, please give us a
call. We have found that most fitment issues can be easily resolved by a conversation with one of our knowledgeable
and friendly staff. If the issue cannot be resolved this way, our warranty evaluation program may be the answer. Please
take a moment to review our recommendations for the care of your exhaust and our warranty information.
PLEASE NOTE: If you have any doubts about your exhaust: DO NOT START THE MOTORCYCLE! ONCE AN EXHAUST HAS
BEEN USED OR MODIFIED, IT CANNOT BE RETURNED FOR CREDIT OR EXCHANGE.
EXHAUST SYSTEM MAINTENANCE
Yoshimura Exhaust Systems require very little care and maintenance; here are a few tips:
1. Use mild car/motorcycle soap to clean the exhaust system—do not use any abrasives or degreasers.
2. Clean your exhaust with metal/stainless polish every 1-2 months to retain the luster and remove dirt and grime.
(DO NOT USE POLISH ON “WORKS FINISH” SYSTEMS)
3. Avoid contaminating exhaust surfaces when hot.
4. 4.Your exhaust system will change color (blue, magenta, purple, and/or gold) due to heat; this is normal.
5. Keep all clamps, bolts and other fasteners tight as exhaust systems are susceptible to vibration damage.
6. If you ride in coastal regions or areas that use salt to control ice and snow, wipe the exhaust down after it cools to
remove any possible salt residue, which can result in rusting.
7. If you are storing your motorcycle for the season, wipe the exhaust system down with rubbing alcohol before
storage.
8. Head pipes glowing (visible in normal light) may indicate an excessively lean condition that must be corrected.
CARBON FIBER:
Carbon fiber equipped exhaust components require special attention. The following addresses wear issues directly
related to carbon fiber:
1. Keep all clamps, bolts and other fasteners tight. Carbon Fiber is very susceptible to vibration damage.
2. Keep all chemicals and solvents away from the carbon fiber, as they will damage the finish.
3. High temperatures will cause the resin in the carbon fiber to break down. Visual signs such as an amber hue in the
resin may be early signs of heat damage to carbon fiber.
4. Upon seeing amber colored resin, discontinue use. The exhaust system needs to be inspected by a representative
from Yoshimura, for repack, and/or repair. Continued use will cause component failure.
STAINLESS STEEL:
Stainless Steel is not rust proof but is less prone to rusting, staining and pitting; but it is prone to oxidation like all
metals.
WORKS FINISH:
1. Works Finish exhaust systems should never be cleaned with abrasives or polishes.
2. Yoshimura recommends using “Bar Keepers Friend” cleaner to remove minor stains.
3. Surface reconditioning services are available to remove scratches and undesirable discoloration due to extreme
heat. Contact Yoshimura Tech Department at [phone] / in CA [phone] for more information.

RE-PACKING TIPS
To maintain maximum sound and engine performance the muffler packing will need to be replaced at some time during
the muffler’s life. Yoshimura recommends repacking your muffler at least once a year.
Failure to maintain the muffler packing may cause damage to the muffler and/or void the warranty. Regularly inspect
the muffler body for discoloration, cracks, rattling, or other signs of wear caused by depleted muffler packing. If muffler
packing is determined to be depleted or worn, a Yoshimura muffler re-pack kit is highly recommended to restore the
muffler to optimum maximum performance.
Yoshimura offers a 3-5 day turn around (plus transit time) to inspect and refurbish used and damaged mufflers.
For more information on muffler repacking please visit our website at: https://www.yoshimura-rd.com/pages/repack-
and-insert-chart
***PRO TIP*** Before you install your new muffler for the first-time log the weight in your Owner’s or Service manual
along with the current hours or mileage on your vehicle. When you are performing periodic maintenance on your
vehicle (like a tire change, or an oil change) you can remove your Yoshimura muffler from the vehicle and weigh it again.
Over time, the packing material inside your muffler will burn off with use, and the muffler will need to be repacked.
When the weight loses approximately 100 grams of the original weight, you should consider getting your Yoshimura
muffler repacked. You can order repacking kit or the parts to repack the muffler from the Yoshimura website, or
your local dealer. You can also contact the Yoshimura sales office and arrange to send in your muffler for the repacking
service too.
IMPORTANT TECHNICAL NOTE
Yoshimura recommends on all race exhaust systems, that all spring joints be safety wired. Recommended wire type
304/316 stainless steel with a .032” diameter should be used.
YOSHIMURA EXHAUST LIMITED WARRANTY
All Yoshimura R&D of America, Inc., exhaust systems carry a one-year limited warranty against defects in workmanship
and/or materials.
WHO IS COVERED?
This warranty is provided to the original purchaser of the exhaust system.
WHAT VOIDS THE WARRANTY?
1. Abuse, misuse, improper installation and/or modifications
2. Custom applications
3. No proof of purchase at the time of warranty. Claimant must provide proof of purchase (original receipt or invoice)
and a warranty authorization number (RMA) obtained from Yoshimura.
4. Finishes such as plating or painted surfaces with discoloration or rust due to inclement weather conditions, exposure
to salt, exposure to chemicals, or lack of maintenance by the customer are not covered.
5. International grey-market product purchased through a dealer/distributor not authorized for your country will not
be supported by this warranty.
EXTENT OF WARRANTY:
Any defective exhaust system properly returned to Yoshimura will be repaired or replaced by Yoshimura. Yoshimura is
not responsible for any other expense incurred by the customer under the terms of this limited warranty, nor is
Yoshimura responsible for any damages either consequential, incidental, special, contingent or otherwise; or expenses
or injury arising directly or indirectly from the use of the exhaust system. Any exhaust system returned to Yoshimura
must be sent at the customers expense along with the proof of purchase and warranty authorization (RMA). Yoshimura
reserves the right to determine whether the terms of the warranty, set out above, have been properly followed. In the
event that the terms are not followed this warranty is void. Yoshimura is the sole determiner of abuse, misuse,

installation errors and modifications—should any of these be found, this warranty is void. The duration of any and all
implied warranties are limited to the duration of the express warranty. All incidental or consequential damages are
hereby excluded. The warranty gives you specific legal rights and you may have other rights, which vary from state to
state. Some states do not allow the exclusion or limitation of incidental or consequential damages or limitations on how
long an implied warranty lasts, so the above limitations and exclusions may not apply to you.
If you have a fitment or other problem, or are missing a part, please double-check this trouble shooting guide first:
1. Reference your instruction sheet and double-check all drawings and instructions
2. Make sure muffler clamps are installed correctly (refer to instructions diagram). On many models, there is a right
and wrong way to install. Also verify part numbers on headers and tail pipe.
3. Always make sure to install spring-mounted manifolds and flanges on cylinder head prior to installing headers.
4. Always take time to examine problems in detail.
5. When all else fails, call our technical support line at [phone]. The technical line is open 9:00am – 4:30pm
Monday through Friday, Pacific Time. Please have the following information handy: Year/Make/Model of
motorcycle, date of purchase, place of purchase, batch dates and part numbers (found on header and tail-pipe
components).
6. Also, feel free to ask through online e-mail at [e-mail], or fax your question/problems to (909) 591-
2198.
To obtain technical information directly from Yoshimura, call [phone].