Installation Instructions

Thank you for purchasing our Honda Grom (MSX125) Complete Stretch Kit.
Our kit comes complete with unlike any other no need to purchase any special tools. We highly
recommend the kit is installed by a trained motorcycle technician but have written these basic
instructions for someone that is mechanically inclined.
PLEASE STOP AND READ INSTRUCTIONS ENTIRELY BEFORE STARTING.
Tools Required:
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5/16 Allen , 3/8 Allen, 9/16 and 5/8 wrench
10mm, 12mm, 14mm, and 17mm wrench
Rubber mallet or section of 2x4 (something soft to tap with)
Needle nose pliers
Metal burr removal tool
Safety glasses
Jack or Motorcycle lift. (The motorcycle need to be secure in order to risk it not falling)
1. Disassembly:
We realize many customers do not own a lift so a 2 ton jack and some 2x4’s will work. Be sure
to have someone hold the front end so the motorcycle does not tip over. You will want to make
sure the rear wheel is off the ground and the bike is in neutral gear. TRS is NOT responsible
for the motorcycle falling over. Use your best judgment or consult a motorcycle
Technician.
Next put on safety glasses and let start working.
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Remove the stock plastic fender/chain guard.
Next locate and remove the Master link
It will be pink if using OEM chain.
Remove link and chain. Use gloves for this as the chain has wax on it and can get dirty.
Next, use a 10mm and 12mm wrench and loosen and remove the chain tensioner nuts and plate at the
end of the swingarm.
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It’s time to pull the Rear Axle. The Nut on the Axle is 19mm and the Axle head is 14mm. Loosen
and remove axle. You should be able to slide the wheel forward and slide the wheel out, as well
as sliding the caliper off the rotor and leaning the caliper over the swingarm.
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Remove chain tensioners. In our test installation we did not have to de-burr the inside of the
swingarm but have depending on your Grom you may have to remove the burrs on the inside of
the channel of your swingarm.
Grab the TRS Extensions pieces and insert in swingarm. You may have to use a rubber mallet
or 2x4 to lightly tap them into position. It is important to know what stretch you want. It’s easy to
tap into place but harder to pull back out. Insert the new extensions until you can see two bolt
holes through the swingarm slot depending on what length you decide to run.
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Once both extensions are installed, insert supplied bolts and powder coated double washers.
But do not tighten.
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Provided in the kit is a brake caliper brace. This goes on the left side swingarm. See pic below
for install. Do not use Stainless Washer for Caliper mount bolt.
Use Nylon Lock nuts to tighten. Barely Crack the Rear banjo Bolt using a 12mm wrench ONLY
ENOUGH to let banjo spin. We recommend you still bleed rear brakes but if you are lucky you
might get away with no air in system.
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We removed and flipped the brake line bracket for a clean installation.
Now that you have the brake line extended slide the caliper inside the OEM position of the new
caliper mount. We then installed the axle to make sure that everything was inline. Use a twist
motion if needed to install axle. If everything is lined up tighten bolts but not too tight yet.
Remove axle and insert rim and tire making sure rotor goes inside caliper.
NOTE: Once caliper is installed check hose to see how close it is to exhaust if too close
rotate more to clear exhaust.
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Tighten axle.
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Grab the included chain and feed one end through the tunnel over the front sprocket. Reach
under bottom and pull chain. Make sure motorcycle is in neutral. Wrap around both front and
rear sprocket and depending on your length you will have to use the supplied chain breaker tool
to separate the links. Please take into consideration you will be adding a new master link and
mark the point you will be removing. Use tool to break chain to desired length. If you do not
know how you use tool, YouTube “how to use chain break tool”. Insert NEW supplied master
link to connect ends
The left side of the OEM swingarm lists the chain tension specs, which you should adhere to.
Using the rubber mallet gently tap each side of the axle nuts backward to obtain the desired
chain tension. Once desired tension is reached you may now tighten all 4 Nylon nuts. After 200
miles re-adjust your tension as the chain will stretch.
Check brakes and bleed if necessary.
Unlike other kits, the TRS kits comes with a 3” rear shock lowering link. To install, loosen top
shock bolt and remove OEM bottom shock bolt. Move shock out of way install lowering block in
place of OEM lower shock mount. See below pic. Use supplied Hardware to re-install bottom
shock. Tighten top shock bolt.
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You do not have to use this. It will level out the bike though. Beware if you do use this you will
have to cut your kickstand so Motorcycle has correct lean when on stand. See pic.
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Make sure all bolts are tight and secure.
Included in your GROM TRS Extension kit is as follows:
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Two Hard Anodized Black extension blocks
4 – Black Powdered Coated Steel Double washers
Four (4) stainless steel extension bolts, washers, and nylon nuts.
One (1) Hard Anodized Caliper mounting bracket
One (1) Black Hard Anodized 3” Rear shock Lowering link with stainless
hardware
One (1) 142 link TSUBAKI 420 chain (4180 average Tensile Strength) greater
than OEM D.I.D. chain.
One (1) TSUBAKI 420 Master link
One (1) TRS chain breaker tool.
Installation Instructions
NOTICE:
Riding a motorcycle is very dangerous and modifying it is done at your own risk. THE RUCK SHOP as a
company, officers, or employees, take no responsibility in any damage towards any persons, property
including the operator of the motorcycle in the use of this extension or installation of said extension.
Please install at your own risk.
Purchaser understands and recognizes that racing parts, equipment and services by or manufactured
and/or sold by TRS, are subject to varied conditions due to the manner in which they are to be installed
and used. The acceptability and suitability of any part sold or manufactured by TRS for a particular
application is solely the purchaser’s decision. TRS makes no warranties whatsoever, expressed or
implied, or written, THERE IS NO WARRANTY OF MERCHANTABILITY. The right to make changes in
the design or add to or improve on ourok product without incurring any obligation to install the same on
products previously manufactured is expressly reserved. Buyer agrees to indemnify and hold Seller
harmless from any claim, action or demand arising out of or incident to Buyer’s installation or use of
products purchased from TRS.
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