{"product_id":"trailmaster-mk125s-pro-series-dirt-bike-125cc-4-speed-semi-auto","title":"TrailMaster MK125S Pro Series Dirt Bike - 125cc, 4-Speed Semi-Auto","description":"\u003ch1\u003eTrailMaster MK125S Pro Series Dirt Bike - 125cc, 4-Speed Semi-Auto\u003c\/h1\u003e\n\u003chr\u003e\n\u003ch2\u003eDescription\u003c\/h2\u003e\n\u003cp\u003eThe TrailMaster MK125S Pro Series is a premium mid-size dirt bike built for riders ready to take on serious off-road terrain. Powered by a Zongshen Balanced Shaft 125cc 4-stroke air-cooled engine producing 6.3hp, it delivers a broad, even power band that keeps performance consistent across all gears. The 4-speed semi-automatic transmission with no-stall automatic clutch makes it approachable for newer riders while still satisfying the demands of more experienced ones.\u003c\/p\u003e\n\u003cp\u003eDesigned with motocross ergonomics and race-grade suspension - including inverted front fork shock absorbers and a nitrogen air gas rear mono shock - this bike handles rough trails and jumps with confidence. Dual disc brakes front and rear provide reliable stopping power across all terrain types, and the low 29-inch seat height makes it accessible to a wide range of riders ages 12 and up.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eZongshen ZS125 Balanced Shaft Engine:\u003c\/strong\u003e 123cc, 4-stroke, air-cooled single cylinder producing 6.3hp at 7,500 RPM - smooth power with reduced vibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-Speed Semi-Automatic Transmission:\u003c\/strong\u003e N-1-2-3-4 shift pattern with automatic clutch - no stalling, easy for newer riders to learn on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectric Start with Kick Backup:\u003c\/strong\u003e Reliable CDI electronic ignition gets you going fast, with a kick starter as a backup option.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInverted Front Fork Suspension (43\/45mm):\u003c\/strong\u003e Race-style inverted front shocks deliver superior handling and absorb impacts on rough terrain.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNitrogen Air Gas Rear Mono Shock:\u003c\/strong\u003e Non-adjustable rear suspension tuned for motocross-style riding stability and comfort.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDual Disc Brakes:\u003c\/strong\u003e Front and rear disc brakes provide consistent, responsive stopping power on any surface.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow 29\" Seat Height:\u003c\/strong\u003e Designed for smaller to intermediate-sized riders, making it an ideal step-up bike for ages 12 and up.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlloy Wheels and Foldable Handle Levers:\u003c\/strong\u003e High-quality alloy hubs paired with YUANXING tires (60\/100-14 front, 80\/100-12 rear) and aluminum linkage for durability.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePerformance Stainless Steel Muffler:\u003c\/strong\u003e Tuned exhaust system enhances engine performance and longevity.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWaterproof Wire Harness:\u003c\/strong\u003e Fully sealed electrical system protects against mud, water, and trail debris.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eShipping\u003c\/h2\u003e\n\u003cp\u003eThis product requires additional shipping. If you'd like a quote before you purchase, fill out the form on this page or email us at service@omahasportsandgames.com for a delivery ETA or to confirm shipping details.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTrailMaster MK125S Pro Series Dirt Bike\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr\u003e\n\u003ch2\u003eWhy You'll Love It\u003c\/h2\u003e\n\u003cp\u003eThe TrailMaster MK125S Pro Series is engineered for riders who want a capable, confidence-inspiring machine without jumping straight into a full-size motocross bike. The semi-automatic transmission removes the barrier of clutch control, so riders can focus on the trail ahead rather than the mechanics of shifting. TrailMaster's attention to build quality shows in every detail - from the waterproof wire harness to the alloy hubs and stainless steel exhaust - making this a bike that holds up through seasons of hard riding. The race-tuned suspension and motocross-style ergonomics mean it doesn't just look the part; it genuinely performs on dirt, gravel, and trail alike. Whether you're a parent investing in your kid's first real dirt bike or a rider stepping up from a smaller machine, the MK125S Pro Series delivers lasting value and genuine off-road capability.\u003c\/p\u003e\n\u003chr\u003e\n\u003ch2\u003eProduct Specifications\u003c\/h2\u003e\n\u003cdiv class=\"custom-product-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003e\u003cstrong\u003eView Product Specs\u003c\/strong\u003e\u003c\/summary\u003e\n\u003ctable border=\"1\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eEngine Type\u003c\/th\u003e\n\u003ctd\u003eZongshen Balanced Shaft 125, Single Cylinder, 4-stroke, Air-Cooled\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eDisplacement\u003c\/th\u003e\n\u003ctd\u003e123cc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Power\u003c\/th\u003e\n\u003ctd\u003e6.3hp @ 7,500 RPM (±1.5%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMax Torque\u003c\/th\u003e\n\u003ctd\u003e8.8 N·m @ 5,500 RPM (±1.5%)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompression Ratio\u003c\/th\u003e\n\u003ctd\u003e9.0:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShift Type\u003c\/th\u003e\n\u003ctd\u003eN-1-2-3-4, 4-Speed Automatic Clutch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eStart Type\u003c\/th\u003e\n\u003ctd\u003eElectric \/ Kick Start\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eIgnition\u003c\/th\u003e\n\u003ctd\u003eCDI\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eTransmission\u003c\/th\u003e\n\u003ctd\u003eChain Drive\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eLubricant\u003c\/th\u003e\n\u003ctd\u003e10W\/40\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFuel Capacity\u003c\/th\u003e\n\u003ctd\u003e0.92 Gal.\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eOverall Size (L x W x H)\u003c\/th\u003e\n\u003ctd\u003e63\" x 27\" x 42\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWheelbase\u003c\/th\u003e\n\u003ctd\u003e31\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSeat Height\u003c\/th\u003e\n\u003ctd\u003e29\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGround Clearance\u003c\/th\u003e\n\u003ctd\u003e10.24\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eMinimum Turning Radius\u003c\/th\u003e\n\u003ctd\u003e1,900 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFront Tire\u003c\/th\u003e\n\u003ctd\u003eYUANXING 60\/100-14\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRear Tire\u003c\/th\u003e\n\u003ctd\u003eYUANXING 80\/100-12\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eWheels\u003c\/th\u003e\n\u003ctd\u003eSteel Rims, High Quality Alloy Hubs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFrame\u003c\/th\u003e\n\u003ctd\u003eHigh Quality Steel Frame\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFront Fork\u003c\/th\u003e\n\u003ctd\u003eInverted Shock Absorbers, 43\/45mm\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRear Shock\u003c\/th\u003e\n\u003ctd\u003eNon-Adjustable Mono Shock\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eUpper\/Lower Connecting Board\u003c\/th\u003e\n\u003ctd\u003eAlloy\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eHandle Lever\u003c\/th\u003e\n\u003ctd\u003eFoldable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eFront Brake\u003c\/th\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eRear Brake\u003c\/th\u003e\n\u003ctd\u003eDisc\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eExhaust\u003c\/th\u003e\n\u003ctd\u003eStainless Steel Muffler\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNet Weight\u003c\/th\u003e\n\u003ctd\u003e149 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eGross Weight\u003c\/th\u003e\n\u003ctd\u003e213 lbs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePacking Size\u003c\/th\u003e\n\u003ctd\u003e55\" x 17\" x 33\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch2\u003eFAQ\u003c\/h2\u003e\n\u003cdiv class=\"custom-product-faq\"\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat age and size rider is the MK125S designed for?\u003c\/summary\u003e\n\u003cp class=\"faq-content\"\u003eThe MK125S Pro Series is designed for riders ages 12 and up. With a seat height of 29 inches and a net weight of 149 lbs, it fits younger teens through adults of average stature. It's an ideal step-up bike from smaller youth machines, and also works well as a beginner-to-intermediate adult trail bike.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat does \"semi-automatic\" mean on this dirt bike?\u003c\/summary\u003e\n\u003cp class=\"faq-content\"\u003eSemi-automatic means the bike has a 4-speed sequential gearbox that you shift manually with your foot, but there is no manual clutch lever to operate. The automatic clutch engages and disengages on its own, preventing the engine from stalling and making it much easier to learn on compared to a fully manual transmission. You still control when you shift up or down, giving you the control of a gearbox without the learning curve of clutch management.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes this bike have circular shifting?\u003c\/summary\u003e\n\u003cp class=\"faq-content\"\u003eNo. The MK125S uses a standard N-1-2-3-4 shift pattern. Circular shifting - where shifting up from 4th gear loops back to neutral and then 1st - is not used on this bike. TrailMaster specifically avoids circular shifting configurations on all of their bikes.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eDoes the bike come assembled or will I need to put it together?\u003c\/summary\u003e\n\u003cp class=\"faq-content\"\u003eThe MK125S ships partially assembled. Some final assembly is required, such as attaching the handlebars, mirrors, and other components. The process is generally straightforward with basic hand tools. Contact us if you have questions about assembly before your order arrives.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eHow does the MK125S ship?\u003c\/summary\u003e\n\u003cp class=\"faq-content\"\u003eThis bike ships freight on a pallet due to its size and weight (213 lbs gross). It will be delivered by a freight carrier, typically curbside. Please contact us at service@omahasportsandgames.com for a shipping quote or delivery ETA before purchasing if needed.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003cdetails\u003e\n\u003csummary\u003eWhat fuel and oil does the MK125S require?\u003c\/summary\u003e\n\u003cp class=\"faq-content\"\u003eThe engine runs on regular unleaded gasoline with a fuel tank capacity of 0.92 gallons. The recommended engine oil is 10W\/40. Always consult the owner's manual for exact maintenance intervals and specifications.\u003c\/p\u003e\n\u003c\/details\u003e\n\u003c\/div\u003e","brand":"TrailMaster Powersports","offers":[{"title":"Red","offer_id":55951843623217,"sku":"TrailMaster MK125S Pro Series Dirt Bike","price":1399.0,"currency_code":"USD","in_stock":true},{"title":"Blue","offer_id":55951843655985,"sku":"TrailMaster MK125S Pro Series Dirt Bike","price":1399.0,"currency_code":"USD","in_stock":true},{"title":"Green","offer_id":55951843688753,"sku":"TrailMaster MK125S Pro Series Dirt Bike","price":1399.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1724\/7681\/files\/12_Ages_12_and_up_-_GoKarts_USA_-1809848_13328818-d30a-4a35-bda4-c033dcd32836.jpg?v=1787763308","url":"https:\/\/omahasportsandgames.com\/products\/trailmaster-mk125s-pro-series-dirt-bike-125cc-4-speed-semi-auto","provider":"Omaha Sports \u0026 Games","version":"1.0","type":"link"}