Step 2. BIG BORE KIT 160CC FOR HONDA MSX125 / HONDA GROM (USA) The Yuminashi Big Bore Series are mentioned to be used in combination with the genuine MSX125 / GROM crankshaft and crankcases. Install the new chain tensioner arm and collar (both included in the KOSO chain tensioner kit), and torque the bolt to 16Nm or 11.8 foot-pounds. We manufacture and retail high end performance parts including pistons, big bore kits, bearings, etc. Koso Grom 125 61mm Performance Cylinder Kit with 4 Valve Cylinder Head is probably one of the best big bore kits available on the market for the Grom. Install the bolts and washers, and torque the bolts to 18 foot-pounds. Sneak peak of Gromlins Honda Grom featuring a full Finbro big bore kit 212cc. 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. Remove the two bolts mounting the left side of the cylinder head to the cylinder, then remove the four cylinder head cap nuts. I wasn't sure which engine modification path I wanted to take with my 2020 Honda Monkey and right from the beginning David was helpful in answering all my questions and ultimately I settled on this kit. The limit for competition is in many countries 160cc, so the Yuminashi R&D has made this 59,25mm kit with 159,56cc to meet the rules about he maximum displacement. I can attest that David offers great pre-sales and after sales support, he will see you right. Repeat the gap measuring process for the lower piston ring. Reinstall the old cam cover, followed by the timing cap and crankshaft cap into the left side crankcase cover. The kit came with all parts needed. NOTE: It’s important that the new piston rings are set in the correct positions on the new piston (all included in the KOSO big bore kit) to prevent oil or combustion gasses from blowing past the piston. If you're looking for top speed performance for your Honda Grom, then install this in conjunction with an exhaust and a big bore kit. It is the most put together kit on the market. Note: If using the stock carburetor with a big bore kit, it most likely will need to be re-jetted but OEM jets are inexpensive and readily available. Step 1. Remove the cam chain guide roller bolt and the chain guide roller. Step 1. C $890.04. 181cc big bore kit Kitaco for Honda MSX125 Grom 125. GROM ON! Thoroughly clean the new cylinder with contact/brake cleaner, then apply a thin film of engine oil to the walls of the cylinder. The kits come complete with a new cylinder head, piston, and all other necessary supporting pieces. This kit is designed to be run with the TB camshaft. However, at the end of the day the Grom engine is a very simple air-cooled engine, and heat is the enemy. Make sure the crankcase mating surface is perfectly clean and install a new cylinder gasket. 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 2. All Rights Reserved. Cover the opening around the connector rod with paper towels or something similar to prevent any debris from getting into the crankcase. If you plan on taking regular highway trips, an oil temperature gauge is highly recommended to make sure the engine does not overheat. Welcome to the first part of our project to make a 2018 Honda Grom faster, and to improve its handling. 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. Next, remove the two mounting bolts and the throttle body assembly from the engine. 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. 186cc Big Bore Kit on a Honda Grom 125; Definitely needs a performance exhaust and an aftermarket fuel controller. KOSO 170cc big bore kit with 4V cylinder head, Part 1: Removing Honda Grom Cylinder Head. Take your GROM from Stock 8HP to over 12HP with this easy to install bolt on 143cc or Get even MORE power and Torque with 181cc Big Bore kits. Step 7. Step 3. 186cc Big Bore Performance Kit (64mm) – Grom: – Ceramic coated all aluminum cylinder (no steel sleeve) – Lightweight 64mm piston with rings, pin, & clips – Head gasket kit. Install one of the piston circlips into the new piston. This is the biggest bore kit on the market. If you already have one, you do not need to select it. TB Clutch Kit. If you have removed this to use another fuel controller, you will need to reinstall it. Special discounts for companies in the powersports industry, Discounts for federal and most state and municipal agencies. I know need a kit for my OG. DH Motoring is THE for high performance Honda Grom and Monkey parts. This Kitaco "NEO" 181cc Big Bore Kit comes with everything you need for an easy installation. You can receive a refund of $75 when returning your ecu if you order a core when checking out. 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. NOTE: To correctly set the timing and valve lash, the engine must be at TDC. 2 product ratings - Koso North America 4V Head Kit w/ 170cc Big Bore Kit MB623003 HONDA Grom 125. Step 4. I'll be back for more DHM goodies in the future! 170cc BIG BORE WITH 4V HEAD KIT | for Honda Grom® and Monkey® This complete top‑kit is the perfect add‑on for all horsepower enthusiast looking for performance ! BIG BORE KIT 160CC FOR HONDA MSX125 / HONDA GROM (USA) The Yuminashi Big Bore Series are mentioned to be used in combination with the genuine MSX125 / GROM crankshaft and crankcases. that is over 100% increase in power from stock. Remove the cover to the rear of the crankcase cover, followed by the crankcase cover itself. Our Koso 4V Head Kit is the ideal engine part to complete the Koso Honda Grom® Big Bore kit. :143: Save Share. Our kit utilizes hardware from TBParts along with an OEM Honda injector and our … I will be buying a second kit for our other grom. Watch the clip below to see the timing and valve lash segments of our Honda Grom Big Bore Kit video. Step 9. In other words, there is a total of 125 cubic centimeters inside your little engine where the magic happens. Torque the bolt to 22Nm or 16 foot-pounds. Honda Grom Finbro Big bore Kit Honda Grom Finbro 183 big Bore Kit Finbro 153 209 218 220 . Remove the seat, plastics and shrouds. This kits totally transforms the bike. Promotions, new products and sales. How Do I Get More Power Out of My Honda Grom? Reinstall the crankcase cover and the cover to the rear of it, then torque the cover bolts to 8 foot-pounds. Watch the clip below to see the cylinder and piston removal segments of our Honda Grom Big Bore Kit video. HARD RACING 264 Rolling Hill Rd. The kit itself is brilliant, nice easy power, the tune feels good I'm very happy. 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. $615.00. Step 8. Make sure the mating surfaces are completely clean, and install a new left crankcase cover gasket. Use a feeler gauge to measure the clearance between the ends of the piston ring, and compare it to the piston manufacturer’s charts. Brand New. Please select your ECU option from the drop down menu when ordering. Customize KOSO Honda Grom/Monkey 170cc 4 Valve Performance Cylinder Kit w/ Forged Piston Go back to product details. the engine can customize parts. Because of its unique 4 valve design, the air flow and performance are increased. Take the top piston ring and seat it in the cylinder using the piston. 67mm 235cc Big Bore Cylinder Upgrade Camshaft Kit For Honda CRF230F SL230 XR230 Description .It is not standard camshaft.Changing the large angle camshaft can increase the time of air inlet, change the engine performance, the power of the compression explosion increases greatly, and the horsepower and torque increase are significantly increased!The camshaft is … High quality parts and no machining required for this 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. **Kits are now shipping within 2 weeks from order date!We are proud to introduce the first "all inclusive" big bore package for the Honda Grom!The DHM 186 kit includes everything you need to convert your Honda Grom in to a big bore machine. Been waiting awhillleeeee for more of these kits to show up in stock. The 4 Valve Head Kit features a forged piston, stainless steel 24 mm intake valves and 20 mm exhaust … Step 3. Driven Adjustable Rearsets Since we are flashing the OEM ecu, you can still use piggybacks on top of this kit should you decide to make any changes. … Directly to your inbox. Step 5. Good price and easy to install alot more power would recommend getting a better starter. Takegawa 181cc 4-Valve SUPERHEAD Big Bore kit w/ 5 AXIS CNC Machined Port Matched Head - '13-20 Honda Grom (NO Fuel Controller)01-05-0130 01-05-0165. The kit includes a ceramic coated cylinder, 61 mm forged piston, rings, pin, gasket kit and banjo bolts. Reinstall the flywheel, the washer and nut, then hold the flywheel with a sheave holder and torque the nut to 64Nm or 47 foot-pounds. Step 11. Takegawa Big Bore Performance Kit Fits: '13-'20 Honda GROM / Grom SF Bolt on 50% - 75% more power! Installation instructions are not included. This new designed head is the perfect addition for those who desire more power and torque. Next, install a new cylinder head gasket. Then, use a rotor puller to draw the flywheel out of the crankcase. Reply. List price: Previous Price C $1,222.87 27% off. Remove the cam chain guide roller bolt and the chain guide roller. Watch the clip below to see the piston installation segment of our Honda Grom Big Bore Kit video. KOSO 171 4 Valve Package. Delivery options and delivery speeds may vary for different locations. 9HP Honda GROM?? 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. Remove the bolt from the bottom of the crankcase, followed by the cam chain tensioner spring and the tensioner push rod. The limit for competition is in many countries 160cc, so the Yuminashi R&D has made this 59,25mm kit with 159,56cc to meet the rules about he maximum displacement. Watch the clip below to see the cam chain tensioner installation segment of our Honda Grom Big Bore Kit video. We are proud to introduce the first "all inclusive" big bore package for the Honda Grom! Disconnect the cable from the negative battery terminal. Night and day difference. RIGID INDUSTRIES LED LIGHTS; HardRacing "Factory Logo" TShirts($5.95) aRacer ; Honda MONKEY 125 PARTS & ACCESSORIES; GROM / GROM SF PARTS & Accessories; Honda CT125 Trail; KAWASAKI Z125 PRO PARTS & Accessories; KTM RC 390/390 Duke PARTS & … SKU: Grom-0105-0316 or (7) GROM / msx125 Takegawa E Stage Big Bore KIT(56mm/ 143cc) Comes with or without Camshaft Pricing: $269.95. Remove the circlip and piston pin from the piston, and slide the piston off the connector rod. Customize and Add to Cart. SF Grom.....Very easy install. Remove the bolt holding the chain tensioner arm. Step 8. This kit is designed to be bolt-on, reliable power. Step 2. The power is incredible for this little thing. Kitaco NEO 181cc Big Bore Kit with Forged Crank Shaft Fits: '13-19 Honda GROM / Grom SF. From United States. Mooresville, NC 28117 USA - 704-799-2192 Fast Shipping.....WORLD WIDE. 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. You no longer have to piece parts together with expensive components to get more power out of your bike. If you are not capable of working on these engines, having a shop perform the install is recommended. Regular price We do custom ECU flashing and reflashing and tune aRacer and PCV as well! NOTE: Work slowly so you don’t damage the new piston, piston rings or cylinder. If your stock clutch is worn, or you'd just like a harder bite, we offer the TB clutch kit as a $40 upgrade. Takegawa Honda Grom / MSX125 Big Bore 143cc E-Stage Kit Takegawa, Big Bore Kit, Honda Grom, msx125 (0) Reviews: Write first review. Loop the timing chain back over the cam sprocket, and reinstall the cam sprocket with the timing mark aligned with the mark in the cylinder head. C $56.51. Next, remove the cylinder head from the engine. Kit Includes: - 181cc Kitaco FORGED Piston - 181cc Kitaco HARD PLATED cylinder - Kitaco FORGED Crank Shaft - Kitaco FORGED H-Style Con-Rod With or Without … © 2000-2021 Partzilla.com. No wonder they make lot's of big bore kit's for them,160cc, 183cc, 204cc $2679 US, 235cc kit (24-26hp at the engine) is $2397 US Should just fit a Daytona Anima 190FDX to it, $1300 AU, 25hp at the engine 1 x KOSO Honda Grom 171 4v Cylinder - Cylinder … It fits inside stock body work for a very stealthy look. Step 2. Its compression ratio of 11.5 to 1 will allow you to still use premium pump gas and keep the reliability of a stock motor. TB Camshaft. Two Finbro Big Bore Honda MSX Groms going head to head on Yorkshire's country roads. Step 4. Apply a thin layer of grease to the underside of the new cylinder head cap bolts. A budget Big Bore Kit (BBK) that makes your GROM simply amazing. YES, you can get more power out of the MSX125, all you have to do is purchase a BBK (Big Bore Kit). Step 3. Reinstall the cam chain guide roller and the washer and pin. Reinstall the starter reduction gear and its shaft and collar. Cylinder head shaped for better combustion and with high efficient port shape with bigger valve ( Ø30.0mm & Ø24.5mm valve, std are 25.5mm and 21mm). The intake valve gaps should be 0.004” or 0.1016mm. This is the biggest Grom big bore kit on the market for your Grom or Monkey 125! Step 1. The ecu will learn and adapt over the first 15-20 miles, so acceleration and overall ride ability will increase up to that point. Watch the clip below to see the cylinder head installation segment of our Honda Grom Big Bore Kit video. Step 1. Step 6. Step 6. 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. The exhaust valve gaps should be 0.007” or 0.1778mm. ENGINE (Big Bore Kits, Camshafts and Engine Parts ) BIG BORE KITS (and spare parts) Finbro; Categories. Step 5. **An upgraded intake and exhaust are not required but are highly recommended! Step 5. Inspect the positioning of the piston ring gaps, and readjust them to the correct positions if they have moved. Watch the clip below to see the flywheel reinstallation segment of our Honda Grom Big Bore Kit video. Watch the clip below to see the cylinder head removal segment of our Honda Grom Big Bore Kit video. Racing camshaft provided. Remove the flywheel by holding it with a sheave holder and taking off the central nut and washer. Reply. Thoroughly clean the new piston and piston rings with contact/brake cleaner. Adjust the valve gaps if necessary. Step 3. Remove the dowels from the old cylinder head, and install them on the new cylinder head. Big Bore Kit Cylinder Piston Kits Change to 125cc for Dirt Bike ATV Honda 152FMH. Step 7. Our 170cc Big Bore kit is the perfect addition for you ! This complete kit comes with everything you need for an easy installation. Watch the clip below to see the ring gap segment of our Honda Grom Big Bore Kit video. Step 7. Remove the cover to the rear of the crankcase cover, followed by the crankcase cover itself. If the ring gaps are too small, the ring ends will touch once they heat up in a running engine, which will quickly cause damage to the rings and cylinder. Install the new cylinder (included in the KOSO big bore kit) over the piston. All parts are Cnc machined and hand tig welded for precise fitment. Our Big bore kit produces 20hp to the wheels! hrcnick11 … Step 6. Take the thermostat from the old cylinder, install it in the new cylinder, and reattach the cable and bracket. Remove the drain plug, then drain the engine oil and reinstall the drain plug. Takegawa quality parts that can be installed straight from the box (ring gap checked and within tolerance). Full Blown Motorsport's Honda Grom turbo kit will make 15 Hp (67% increase in power) on pump gas without any engine work. Hi compression piston 11.1:1. Customize Your Item. NOTE: Before installing the big bore kit, it’s important to check the ring gaps in the new piston and cylinder. Included: For fastest response, contact us through email  - david@dhmotoring.com. We also install a KOSO cam chain tensioner kit to cope with the additional forces from the upgraded motor. 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. 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. The only negative would be if on the compression stroke the starter motor can struggle to turn over the bike, now this is common for all big bore upgrades and not specific to this kit, just be aware (is easily fixed by rolling the bike backwards off the compression stroke). Take the top piston ring and seat it in the cylinder using the piston. Choosing a selection results in a full page refresh. The ECU reflash requires your stock narrowband O2 sensor to be installed and plugged in. Next, remove the starter reduction gear and its shaft and collar from the left side of the crankcase. 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 8. The 160cc Big Bore kit … Do You Wanna Be a Wheelie Popping Daddy!?! Make sure the mating surfaces are clean, and install the new cylinder head (included in the KOSO big bore kit). You will need to send us your ECU to be reflashed for proper fueling to run with the kit. Turned this grom into a very fun ride. Lots of low end power and gains all across the board Includes - Forged piston - Custom head gasket - FBM HD Case/Head studs - Machined case halves - Upgraded studs - Iron ductile sleeve Step 1. Follow the steps below, and watch our Honda Grom Big Bore Kit Installation video above to learn how to enhance a Grom’s performance. Next, remove the collar, washer and the tensioner arm. Step 6. ORDERS: 704-799-2192 BIKE SPECIFIC PARTS PAGES FOR NEW '03-'20 Models (Grom, Monkey Z125, RC390, R3, R1, R6, ZX-10, ZX6 CBR's, GSX-R's & more) "VIC" … TBparts 186cc Big Bore Performance Kit (64mm) with Performance Camshaft and Race Head by JC Racing with larger bore KOSO intake. 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. Honda MSX125 Grom 2014-2019 and 2019-2020 Monkey 125 Greater performance vs. the KOSO 170cc kit. Step 1. You no longer have to piece parts together with expensive components to get more power out of your bike. If you would like to add a big valve head or change the cam, etc., you can do so and use your piggyback fuel controller (pcv, etc) to tune it as you normally would. 19 watchers. Elite OEM (Original Equipment Manufacture) Parts Distributor for premium brands! Step 4. The 160cc Big Bore kit … Step 2. Step 9. It includes : a 170cc ceramic coated cylinder, forged piston, performance camshaft, bearing, rocker arms, 4 valve cylinder head, intake manifold, gaskets, and more. 186cc Grom Big Bore Kit Performance (64mm) and Oil Cooler Kit: – Ceramic coated all aluminum cylinder (no steel sleeve) – Lightweight 64mm piston with rings, pin, & clips – Head gasket kit – Oil Cooler Kit. The all aluminum ceramic coated cylinder is lighter than a steel sleeved aluminum cylinder, … Step 10. NOTE: Don’t lose the woodruff key in the crankshaft. 4V engine : FinBro 235cc / 204 cc msx/grom engine for 4v cylinder head. Kit with: Press the space key then arrow keys to make a selection. Next, remove the cam sprocket from the cylinder head. $1559.00 Add to cart Details From the factory, your Grom packs a 125cc engine. Buy It Now +C $43.97 shipping estimate. Part 2: Replacing Honda Grom Cam Chain Tensioner. If you do not already own one, please add it by using the drop down menu when ordering. Top Rated Seller Top Rated Seller. If you do not wish to send us your ECU, we can provide a core ECU for an additional fee. We develop, race, and tune / flash the fastest Honda Groms in the country! Literally checking website everyday, sent a few emails. The fact that we've reflashed the stock ecu for fuel and timing will actually provide a better base than the stock, unmodified ecu!
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