This is the biggest bore kit on the market.

Take the thermostat from the old cylinder, install it in the new cylinder, and reattach the cable and bracket.

Watch the clip below to see the flywheel reinstallation segment of our Honda Grom Big Bore Kit video. In other words, there is a total of 125 cubic centimeters inside your little engine where the magic happens. Reinstall the cam sprocket bolt, and torque it to 20 foot-pounds while still holding the crankshaft to prevent it from moving.

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. Sell your vehicle through our consignment program!

Step 1.

Thoroughly clean the new cylinder with contact/brake cleaner, then apply a thin film of engine oil to the walls of the cylinder. Remove the bolt from the bottom of the crankcase, followed by the cam chain tensioner spring and the tensioner push rod. NOTE: The KOSO cam chain tensioner kit will withstand the extra loads that will be generated from the upgraded motor once the big bore kit has been installed. 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. Step 7. Step 1. Remove the dowels from the old cylinder head, and install them on the new cylinder head. Remove the seat, plastics and shrouds.

Track racing these bikes also has become very popular and more power is almost certainly needed to compete these days. TBparts 186cc Big Bore Performance Kit (64mm) with Performance Camshaft and Race Head by JC Racing with larger bore KOSO intake. NOTE: Don’t lose the woodruff key in the crankshaft. Intake valve is 27mm (+1.5mm over stock) and Exhaust is 21.5mm (+.50mm over stock). Remove the airbox and the exhaust system, then disconnect the throttle cables, electrical connectors and hoses attached to the throttle body. Install one of the piston circlips into the new piston. Step 4. Watch the clip below to see the cylinder head removal segment of our Honda Grom Big Bore Kit video. Watch the clip below to see the cylinder and piston removal segments of our Honda Grom Big Bore Kit video.

Included are new cam cover and tappet cover o-rings. Step 10. Reinstall the tensioner push rod, the cam chain tensioner spring and the bolt into the crankcase.

Lighter than stock and blended stems for better flow. 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. Repeat the gap measuring process for the lower piston ring.

Step 1.

We have sold and installed TB products with great success.

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

Inspect the positioning of the piston ring gaps, and readjust them to the correct positions if they have moved. Honda Grom Big Bore Kit - FINBRO - Install Part 1 - Great Low … This is the biggest Grom & Monkey 125 bore kit on the market! Delivery options and delivery speeds may vary for different locations. Remove the two bolts mounting the left side of the cylinder head to the cylinder, then remove the four cylinder head cap nuts.

KOSO 170cc big bore kit with 4V cylinder head, Part 1: Removing Honda Grom Cylinder Head.

Install the new cam chain guide roller (included in the KOSO chain tensioner kit), and torque the bolt to 10Nm or 7.5 foot-pounds. Step 3. Step 8.

Remove the circlip and piston pin from the piston, and slide the piston off the connector rod. Step 7.

Now that the big bore kit is installed on our Honda Grom and the top end is rebuilt, our next project is to install a larger throttle body, a high-flow air filter, and an upgraded exhaust system. Step 7. Make sure the mating surfaces are completely clean, and install a new left crankcase cover gasket. 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! Reinstall the crankcase cover and the cover to the rear of it, then torque the cover bolts to 8 foot-pounds. Remove the bolt from the bottom of the crankcase, followed by the cam chain tensioner spring and the tensioner push rod. Torque the bolt to 22Nm or 16 foot-pounds. Use a feeler gauge to measure the clearance between the ends of the piston ring, and compare it to the piston manufacturer’s charts. Step 9.

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

Step 5. Carefully remove a tiny amount of material from the end of the piston ring if the gap is too small by using a ring end gap grinder to correct the ring gap.

VERY IMPORTANT: ALL Big Bore Kits requires an Aftermarket Fuel Controller and A/F Monitor (not included) We highly recommend the Dyno Jet PCV, and WBC2 for proper control of the Fuel, maximum performance, and Longevity. Welcome to the first part of our project to make a 2018 Honda Grom faster, and to improve its handling.

Step 1. Watch the video above to see our Honda Grom intake and exhaust installation video.

Watch the clip below to see the cam chain tensioner installation segment of our Honda Grom Big Bore Kit video.

Kicking that up a few notches with a big bore kit is the quickest way to boost power. Intended for off-road use or race purposes; may not meet regulations of pollution controlled roads or highways.

Hold the crankshaft with a socket to stop it and the cam sprocket from rotating, and remove the cam sprocket bolt.

Step 3. This kit will also need proper tuning to run properly. There are no installation instructions, but if you can replace your piston, you can install this bore kit as the parts are installed in the same manner as the OEM parts. Then, use a rotor puller to draw the flywheel out of the crankcase. Step 8. 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. Remove the cam chain guide roller bolt and the chain guide roller. Adjust the valve gaps if necessary.

Use a, Bottom oil ring gap at approximately 7 o'clock, Oil expansion ring gap at approximately 11 o'clock, Top oil ring gap at approximately 5 o'clock, Lower piston ring gap placed at approximately 11 o'clock, Top piston ring gap at approximately 1 o'clock, Now that the big bore kit is installed on our Honda Grom and the top end is rebuilt, our next project is to, install a larger throttle body, a high-flow air filter, and an upgraded exhaust system.

Click to share on Facebook (Opens in new window), Click to share on Twitter (Opens in new window), Click to share on Pinterest (Opens in new window), TBparts TBW9150 big bore kit with TBW1050 Camshaft, Port / Flow Cylinder Head with multi-angle valve job, Backcut oversize valves for more flow at all camshaft lifts. NOTE: To correctly set the timing and valve lash, the engine must be at TDC. Elite OEM (Original Equipment Manufacture) Parts Distributor for premium brands! This product is legal for closed-course competition use only; for racing vehicles (a competition vehicle not used on public highways).

From the factory, your Grom packs a 125cc engine.

You no longer have to piece parts together with expensive components to get more power out of your bike. Kits will vary in size, additi…

High Profile Cycles has been an Authorized Dealer for Trail Bikes LLC (TBparts) since 2010. Remove the bolt holding the chain tensioner arm.

Intake manifold port is larger than stock. Watch the clip below to see the cylinder head installation segment of our Honda Grom Big Bore Kit video. Watch the clip below to see the timing and valve lash segments of our Honda Grom Big Bore Kit video. Step 5. NOTE: Before installing the big bore kit, it’s important to check the ring gaps in the new piston and cylinder. Step 1. Step 2.

Step 6.

Special discounts for companies in the powersports industry, Discounts for federal and most state and municipal agencies.

Reinstall the starter reduction gear and its shaft and collar. The kits come complete with a new cylinder head, piston, and all other necessary supporting pieces.

The all aluminum ceramic coated cylinder is lighter than a steel sleeved aluminum cylinder, reduces friction (increasing power), improves sealing, and provides better heat transfer (runs and cools down quicker).

Step 9.

Step 11.

RECOMMENDED ITEMS FROM OUR STORE (not included in this listing), KOSO Performance Throttle Body  & Injector System.

Please have one purchased and installed before your first engine start up. 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.

Follow the steps below, and watch our Honda Grom Big Bore Kit Installation video above to learn how to enhance a Grom’s performance. Apply a thin layer of grease to the underside of the new cylinder head cap bolts. JC Racing, Koso Noth America, Tbparts / Trail Bikes LLC. As you can see in the comparison table below, you have a lot of options.

The exhaust valve gaps should be 0.007” or 0.1778mm. Step 1. Reinstall the cam chain guide roller and the washer and pin. We are proud to introduce the first "all inclusive" big bore package for the Honda Grom! Note: Use of included big valves requires valve seats to be cut per included instructions. Step 2.

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