6.5 HP Mini Bike Engine & Drivetrain Kit with 420 Chain

Our 6.5 HP mini bike engine & drivetrain kit with 420 chain and sprocket options is a truly superb way to upgrade a worn and tired old mini bike as well as being an outstanding drive system combination pack on which to build that custom mini bike project that you always wanted.

The 196cc 6.5 Hp Engine:
The 196cc 6.5 HP Honda clone mini bike engine is one of the most widely -- if not the widest -- used gasoline engines in the world today. Commonly known as the Honda-clone engine in reference to its initial brand, this design revolutionized the concept of small engines for both motorsports and portable utility equipment. This mini bike engine is a direct replacement for the 6.5 Hp mini bike engine used on the Baja Motorsports Baja Blaster (BB65), Baja Dune (DN65), Mini Bikes MB165 & MB200, & Baja Sand Dog (SD65) and a whole host of generators, pressure sprayers, water pumps, snowblowers, and a thousand other products.

This EPA certified mini bike engine is a single-cylinder air-cooled engine ideal for lightweight applications, including custom projects. With Monster Scooter Parts' convenient inventory of spare and replacement parts, there is no longer any need for the home mini bike builder to scrounge second-hand "junk engines" and mini bike parts as was all too often the case in years past. This engine includes the manual pull start, air filter, carburetor, fuel tank, muffler, and spark plug as shown. Please refer to the Specifications for more detailed information.

The Clutch:
The clutch assembly with a 3/4" shaft bore and a 10 tooth 420 chain sprocket for mini bikes is a very useful piece of drive system hardware that offers a multiplicity of applications. The 3/4" shaft bore diameter is one of the most common sizes in powersports machines, especially with aftermarket horizontal shaft gas engines. In addition, the 420 chain clutch sprocket is used on many mini bikes, gas scooters, gas pocket bikes, mini choppers, ATVs, go-karts, and dirt bikes.

The 420 Open Loop Chain:
Our 420 open loop chain may be adapted for use on a wide range of mini bike brands and models. We include fiven feet of 420 chain along with a master link. A bit stouter than #35 chain, the 420 size chain offers a more robust energy transfer between the clutch sprocket and the drive sprocket as well as being a better chain to absorb the power of a gas-powered mini bike engine. Please note that you will need to shorten the chain yourself if the chain is too long for your application.

The Sprockets:
We offer this great mini bike engine & drive train kit with your choice of sprockets. Unlike the 10 tooth clutch sprocket, these drive sprockets are available in 40 tooth, 48 tooth, 50 tooth, and 60 tooth configurations. When selecting your sprocket option please refer to the Specs to the right side of this page. The primary consideration will be the number of mounting holes and spacing. A mini bike sprocket is an item that is usually quickly and easily replaced. Mini bike sprockets are designed to be used hard on uneven, unpaved surfaces, and chipped broken sprocket teeth, or bent mini bike rear sprocket discs are the normal hazards in the life of a mini bike. If such a minor tragedy occurs on your mini bike, we are still here for you with the right replacement.

All in all, any of our 6.5 HP mini bike engine & drivetrain set with a 420 chain and sprocket combinations is an incredibly good deal for the mini bike enthusiast. In addition, we will always be here for you to provide the replacement wheels, tires, brakes, throttles, bearings, and any other mini bike or powersports parts and accessories that you need.

⚠ WARNING California Residents: Proposition 65 Warning

Engine:
Type: Single cylinder air-cooled 4-stroke
Displacement:196cc
Rated Power: 4.85KW/3600rpm (6.5 hp)
Max Torque: 9.76 ft-lbs/2500 rpm
Ignition System: Non-contact Transistorized Ignition (TCI)
Start Mode: Recoil pull start
Fuel Tank Capacity: 4.2 liters (1.11 gallons)
Fuel Type: 87 octane or higher
Engine Oil Capacity: 0.5 liters (0.53 quarts)
Engine Oil Type: SAE 10W30 API: SF
Bore: 68 mm
Stroke: 154.1 mm
Idle Speed: 1500 rpm +/- 150 rpm
Spark Plug: Meiya-F7RTC, Champion-CRN9YC, NGK-BPR6ES
Choke: Manual
Fuel Shutoff: Yes
PTO Shaft Rotation: Counter clockwise
Output Shaft Diameter: 3/4 inches
Output Shaft Length: 2-1/4 inches
Shaft Type: Keyed; Non-tapered
Dimensions (L X W X H (inches): 15-1/4 x 12-1/4 x 13
Weight: 34 lbs.
Meets EPA 2010 off-road engine standards
Meets EPA EVAP standards

Clutch:
Bore diameter: 3/4"
Chain compatibility: 420
Sprocket tooth count: 10
Overall diameter: 4-1/4"

Chain:
Size: 420 Open Loop with Master Link
Length: 5'
Pitch: 1/2"
Roller diameter: 5/16"
Roller width: 1/4"

40 Tooth Sprocket:
Diameter: 6-5/8"
Mounting holes: 4
Mounting hole diameter: 5/16"
Mounting hole distance (across): 3-3/16"
Center hole diameter: 1-9/16"

48 Tooth Sprocket:
Diameter: 7-7/8"
Mounting holes: 4
Mounting Hole Spacing (side by side): 2"
Mounting Hole Spacing (across): 2-9/16"
Mounting Hole Diameter: 3/8"
Center Hole Diameter: 2"

50 Tooth Sprocket:
Diameter: 8-3/16"
Mounting holes: 4
Mounting hole diameter: 5/16"
Mounting hole distance (across): 3-3/16"
Center hole diameter: 1-9/16"

60 Tooth Sprocket:
Diameter: 9-3/4"
Mounting holes: 8
Mounting Hole Spacing (center to center): 3" & 3-1/2
Mounting Hole Diameter: 3/8"
Center Hole Diameter: 2-1/8"