Take the top piston ring and seat it in the cylinder using the piston.

Step 5. Inspect the positioning of the piston ring gaps, and readjust them to the correct positions if they have moved. Step 3. Watch the clip below to see the ring gap segment of our Honda Grom Big Bore Kit video. Step 4. Watch the clip below to see the flywheel reinstallation segment of our Honda Grom Big Bore Kit video. Apply a film of assembly lube to the piston pin, and install the pin halfway into the piston. Step 11.

We also install a KOSO cam chain tensioner kit to cope with the additional forces from the upgraded motor.

Follow the steps below, and watch our Honda Grom Big Bore Kit Installation video above to learn how to enhance a Grom’s performance. Remove the flywheel by holding it with a sheave holder and taking off the central nut and washer.

Sell your vehicle through our consignment program! Then, use a rotor puller to draw the flywheel out of the crankcase. Step 3. Step 6. In other words, there is a total of 125 cubic centimeters inside your little engine where the magic happens. Watch the clip below to see the piston installation segment of our Honda Grom Big Bore Kit video. Make sure the crankcase mating surface is perfectly clean and install a new cylinder gasket. Step 2. We have sold and installed TB products with great success. Set the engine to TDC (top dead center) by removing the cam cover from the left side of the cylinder head, then removing the timing cap and crankshaft cap from the left side crankcase cover, rotating the crankshaft counterclockwise until the T mark is in the center of the timing window and the mark on the cam sprocket is aligned with the mark on the cylinder head. Reinstall the cam sprocket bolt, and torque it to 20 foot-pounds while still holding the crankshaft to prevent it from moving. Use a feeler gauge to measure the clearance between the ends of the piston ring, and compare it to the piston manufacturer’s charts. High Profile Cycles has been an Authorized Dealer for Trail Bikes LLC (TBparts) since 2010. Included are new cam cover and tappet cover o-rings. Step 3. Install the new valve covers with the small arrows pointing upward. Put the piston over the connector rod with the triangle mark facing down (toward where the exhaust will be once the engine is reassembled), then push the piston pin through the rod and install the second piston circlip. Thoroughly clean the new cylinder with contact/brake cleaner, then apply a thin film of engine oil to the walls of the cylinder. Step 2. Step 7.

Step 5. Next, remove the collar, washer and the tensioner arm. Welcome to the first part of our project to make a 2018 Honda Grom faster, and to improve its handling. Remove the bolt from the left side of the cylinder that holds the cam chain guide wheel, and then remove the guide wheel from the cylinder and the cylinder from the crankcase. TBparts 186cc Big Bore Performance Kit (64mm) with Performance Camshaft and Race Head by JC Racing with larger bore KOSO intake. Check that the T mark is centered in the crankcase timing window, and put a socket on the crankshaft to hold the engine at TDC. RECOMMENDED ITEMS FROM OUR STORE (not included in this listing), KOSO Performance Throttle Body  & Injector System. This kit will also need proper tuning to run properly. Step 7. Step 9. Honda Grom Big Bore Kit - FINBRO - Install Part 1 - Great Low … Remove the bolt from the bottom of the crankcase, followed by the cam chain tensioner spring and the tensioner push rod. Kicking that up a few notches with a big bore kit is the quickest way to boost power. Torque the bolt to 22Nm or 16 foot-pounds.

Remove the seat, plastics and shrouds.

Position the new piston so that the small triangle denoting the exhaust side of the piston is at 6 o'clock, then install the new piston rings in the following order and set each piston ring gap as follows: Watch the clip below to see the piston ring installation segment of our Honda Grom Big Bore Kit video. Step 4. On small bore street bikes like the Honda Grom and Kawasaki Z125, a big bore kit definitely adds some fun over the underpowered stock engines at the track! Intake valve is 27mm (+1.5mm over stock) and Exhaust is 21.5mm (+.50mm over stock). JC Race Head – JC heads start with a basic Honda OEM Cylinder Head core. Kits will vary in size, additi… Install one of the piston circlips into the new piston. Step 1. NOTE: To correctly set the timing and valve lash, the engine must be at TDC. Install high quality stainless steel oversize valves. Remove the cam chain guide roller bolt and the chain guide roller. Step 4. Remove the cable and bracket from the thermostat (located in the lower left side of the cylinder) and remove the O2 sensor from the right side of the cylinder head. Remove the dowels from the old cylinder head, and install them on the new cylinder head. Watch the clip below to see the cylinder and piston removal segments of our Honda Grom Big Bore Kit video. We also install a KOSO cam chain tensioner kit to cope with the additional forces from the upgraded motor. Next, remove the cylinder head from the engine. Step 1.

Remove the bolt from the bottom of the crankcase, followed by the cam chain tensioner spring and the tensioner push rod.

Honda MSX125 (Grom) Yuminashi 160cc Ultimate Big Bore kit …

In this video and guide, we fit a KOSO big bore kit, which includes a four-valve head that will increase the cylinder bore to 170cc. All Rights Reserved. NOTE: For this project, you’ll need a well-stocked toolbox that includes a ratchet, socket set, wrenches, screwdrivers, a torque wrench and other essential tools, as well as the special tools listed above.

Step 2. Step 7. Not legal for vehicles registered and used in California. The kits come complete with a new cylinder head, piston, and all other necessary supporting pieces. Just released, TB's fantastic 186cc Honda Grom/Honda Monkey 125 big bore, complete with cylinder, piston, oil cooler, lines, high flow valves, springs, cam, all gaskets and hardware. Note: Use of included big valves requires valve seats to be cut per included instructions. Delivery options and delivery speeds may vary for different locations. NOTE: Before installing the big bore kit, it’s important to check the ring gaps in the new piston and cylinder. Reinstall the old cam cover, followed by the timing cap and crankshaft cap into the left side crankcase cover.

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