Disclaimer
FMF Racing inspects all products prior to packaging and strives toward improving its products. Our guarantee is limited to the replacement of defective
products. This limited guarantee is in lieu of all other guarantees or warranties implied or expressed. Buyer assumes all risk for any and all damage caused to
himself, a third party and/or property by virtue of failure of this product. We make no warranty as to products distributed by FMF Racing, expressed or implied
from our suppliers or 3rd party vendors. This includes, without limitation, any warranties or merchantability and fitness for a particular purpose. All products are
offered and designed for use with standard machines. FMF Racing makes no claims as to the products effectiveness on modified machines. FMF Racing is the
sole determiner of abuse, misuse, installation errors and modifications. We assume no liability for any errors in listings, specifications, part numbers, prices or
model applications. We reserve the right to change specifications, product descriptions, product quality, pricing and application at any time without notice and
without further obligation. By installing and/or using an FMF product, you hereby accept and understand these stated terms and conditions and have followed all
instructional steps.
M A I N T E N A N C E
I N S TA L L AT I O N
POST-INSTALLATION
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Before operating your 50cc, we recommend stock jetting. Our sea-level, 70 degree, jetting recommendations
are to be used as a guide only. There are too many variables outside of FMF’s control to give you an exact
configuration. If you’re not capable of tuning your bike/ATV yourself, please find a mechanic in your area who
is capable to take on this role. Refer to our website for more jetting information.
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Start the engine and bring it up to operating temperature. Check for exhaust leaks.
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Let engine cool completely and re-torque all mounting hardware to the manufacturers specifications.
To clean your FMF muffler, simply use soap and water when it becomes dirty. Windex® works great on the muffler canister to
prevent streaking and uneven discoloration. Let the exhaust system cool before cleaning. Do not spray cold water onto a hot
exhaust. Dry completely to prevent streaking.
We recommend repacking your Titanium 4 muffler after 20-30 hours of use when properly jetted. This will maintain peak
performance and keep that race tone. We have various packing materials to choose from. We also recommend cleaning the
spark arrestor screen (if equipped) every 30 hours of use using a wire brush gently.
To repack the muffler, remove the four (4) allen screws from the front of the muffler using a 4mm allen wrench. Do not remove the rear end-
cap. Gently slide out the front mid pipe from the muffler canister. You may need to use a rubber or plastic mallet to lightly tap it out. Be careful
not to damage the muffler. Unwrap the packing from the core and discard. If your muffler uses a 2 stage packing, only remove the outer layer.
Wrap the core with new packing and secure with a strip of masking tape. Do not pack too tightly, as this will hamper performance and increase
the sound level. Before re-installing the inner core assembly, apply a thin layer of hi-temp silicon on the front endcap where the aluminum can-
ister slips over. Slip inner core assembly into canister making sure the perforated core fully seats in the rear endcap. Re-install the allen
screws until snug or tighten 1/4 turn after the screw makes contact with the canister.
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Insert the OEM exhaust port gasket into the exhaust port. Using some hi-temp. silicon will help hold it into place.
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Install the FMF header onto the exhaust port using the existing nuts and loosely tighten. If your exhaust was
supplied with an extra sleeve, you will need to insert this into the exhaust port prior to inserting the FMF header
flange.
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With clean hands, gently slip the FMF muffler onto the header. The FMF logo should be at 3 & 9 o’clock when
looking from the rear for proper positioning. Use some hi-temp. silicon at the joint to aid sealing.
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Connect the muffler to the header with the supplied 70mm spring.
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Slide the short strap bracket carefully over the muffler and position it to the rear upper mounting point. Be careful
not to scratch the canister and make sure the “inside” sticker on the bracket is towards the subframe.
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Using vise grip pliers, pinch the strap bracket tabs together and install the supplied 8mm bolt with the aluminum
spacer between the subframe and the bracket. Do not fully tighten at this time.
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Slowly tighten all mounting fasteners and clamps to OEM specified torque specs, starting from the header and
working back. Make sure the header and muffler are in neutral positions and not binding.
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Re-install the seat and plastic side panels in the reverse order.
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Inspect the complete exhaust to make sure the exhaust system is not in contact with the frame, shock spring,
engine, body panels or any cables, hoses or wiring. The exhaust system should only be in contact with the
exhaust port and mounting points. Confirm all controls operate in accordance with the manufacturer’s
specifications.
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Your muffler may have a protective coating to protect its finish. You will need to clean this off prior to starting the
engine with either Windex® or 409®.
