- Clutch -
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  • CLUTCH POWER UP KIT
  • Install this complete kit for greater top
    end speed, smoother shifts and better
    holeshots.
  • This is an absolute must for racing!
  • Please Call for Prices
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  • FRONT CLUTCH VARIETER
  • Front clutch with different degree belt
    surface designed for greater top end speed.
  • Made from a tough nickel alloy for exteded
    life.
  • Please Call for Prices
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  • CLUTCH X-POWER ROLLERS
  • Hi-performance rollers desinged for racing.
  • (50cc and 90cc)
  • FJ401040 (4g)   
  • FJ401045 (4.5g)
  • FJ401050 (5g)   
  • FJ401060 (6g)   
  • FJ401070 (7g)   
  • FJ401080 (8g) 
  • Please Call for Prices  
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  • REAR CLUTCH SHIFT SPRINGS
  • High quality shift springs with a special
    hi-efficiency coating to resist heat build up.
  • Set of 3 springs (50cc and 90cc)
  • FI014101 (1000 rpm)
  • FI014151 (1500 rpm)
  • FI014201 (2000 rpm)
  • Please Call for Prices
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  • REAR CLUTCH COMPRESSION SPRING
  • High quality compression spring with a
    special hi-efficiency coating to resist heat build up.
  • (50cc and 90cc)
  • FH014101 (1000 rpm)
  • FH014151 (1500 rpm)
  • FH014201 (2000 rpm)
  • Please Call for Prices
  • CLUTCH SPRING SLIDER
  • State of the art design prevents spring wind up
  • FM014000 (50cc & 90cc)
  • Please Call for Prices
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  • FRONT CLUTCH VARIETER FACE PLATE
  • This face plate with matching degree belt surface
    should be purchased and installed with the front clutch varieter.
  • FD014001 (50cc)
  • FD035001 (90cc)
  • Please Call for Prices
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  • LIGHTENED HI-REV REAR CLUTCH
  • This rear clutch is lighter than a stock unit for
    quicker revs and has larger pad surfaces for
    more positive grab and better acceleration.
  • Recommended for motocross and TT racing.
  • FA014001 (50cc & 90cc)
  • Please Call for Prices
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  • ADJUSTABLE REAR CLUTCH
  • Adjustable weight postitions for modifying torque
    delivery. Shift spring location is adjustalbe for
    different RPM.
  • Recommended for hare scrambles and hill climbing.
  • FA014003 (50cc & 90cc)
  • Please Call for Prices
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  • POSI-GRIP REAR CLUTCH HOUSING
  • Clutch housing with a special inner surface for a
    positive grip when clutch engages.
  • The more horsepower you have the more you
    need this!
  • FG029002 (50cc & 90cc)
  • Please Call for Prices
- Engine -
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  • ALUMINUM CYLINDER WITH COMPLETE
    TOP END KIT
  • Each kit comes complete with cylinder, head, piston,
    rings, wrist pin, top bearing, clips, and gaskets.
  • 52mm bore.
  • AL052045
  • Please Call for Prices
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  • PORTED CYLINDER WITH COMPLETE
    TOP END KIT
  • Each kit comes complete with ported cylinder,
    hi-compression head, piston, rings, wrist pin,
    top bearing, clips, and gaskets.
  • 52mm bore.
  • PORTCYL
  • Please Call for Prices
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  • HI-COMPRESSION HEAD
  • Hi-compression head with 180 psi static pressure.
  • Head can be made with more or less pressure to
    match your specifications.
  • 52mm bore.
  • HICOMPHD
  • Please Call for Prices
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  • WATER COOLED KIT WITH ELECTRIC
    WATER PUMP
  • Each kit comes complete with cylinder, head, piston, rings, wrist pin, top bearing, clips, gaskets, electric water pump, radiator, overflow bottle, hoses and clamps.
  • 52mm bore.
  • WTREL5245
  • Please Call for Prices
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  • WATER COOLED KIT WITH MECHANICAL
    WATER PUMP
  • Each kit comes complete with cylinder, head, piston,
    rings, wrist pin, top bearing, clips, gaskets,
    mechanical water pump, radiator, overflow
    bottle, hoses and clamps.
  • 52mm bore.
  • WTRMC5245
  • Please Call for Prices
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  • BIG BORE KIT
  • Each kit comes complete with piston, wrist pin,
    top bearing, clips, gaskets, hi-compression head,
    and cylinder. Direct bolt on with no modifications
    needed for either kit to achieve 70cc or 99cc.
  • MB014540 kit has 54mm bore. In order to obtain
    105cc the crankshaft must be changed to a 45mm
    stroke.
  • MB014472 (70cc)
  • MB014540 (99-105cc)
  • Please Call for Prices
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  • PISTON
  • Includes piston, rings, wrist pin and clips.
  • 13617HA (53mm)
  • 14617CA (54mm)
  • Please Call for Prices
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  • TOP END GASKETS
  • Includes head gasket and base gasket.
  • 53MMGSKT (53mm)
  • 54MMGSKT (54mm)
  • Please Call for Prices
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  • 45mm CRANKSHAFT
  • Use with Big Bore Kit to obtain 105cc.
  • CRANK45
  • Please Call for Prices
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  • 48mm CRANKSHAFT
  • Use with Big Bore Kit to obtain 110cc.
  • Note: machining cases is necessary.
  • CRANK48
  • Please Call for Prices
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  • FLYWHEEL PULLER
  • Use this tool to easily remove the flywheel.
  • FL004521
  • Please Call for Prices
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  • ADJUSTABLE DC HI-PERFORMANCE CDI BOX
  • Most advanced brain box on the market for minis. Switches your ignition system from AC to DC for a much stronger and cleaner spark. Integrated computer chip advances timing 25 degrees on take off for best bottom end then retards back to zero as it reaches higher RPMs.
  • DCCDI
  • Please Call for Prices
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  • HI-PERFORMANCE COIL
  • Produces a stronger spark for hi-performance motors.
  • HIPERCOIL
  • Please Call for Prices
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  • HI-REV COOLING FAN
  • Hi-rev low profile cooling fan with less resistance for quicker acceleration and stronger fins for more durability at high rpm.
  • DF001000 (50cc & 90cc)
  • Please Call for Prices
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  • COOLING FAN
  • Quality cooling fan with custom looking chrome or carbon fiber finish.
  • NA014M00 (chrome)
  • NA014C00 (carbon)
  • Please Call for Prices
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  • CHROME AIR SHROUD
  • Add a totally custom chrome look to your quad.
  • NC014C00
  • Please Call for Prices
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  • CARBON FIBER AIR SHROUD
  • Add a totally custom carbon fiber look to your quad.
  • NB014C00
  • Please Call for Prices
- Exhaust -
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  • HI-PERFORMANCE EXHAUST
  • Chrome Plated
  • Koso and Maximum RPM have teamed up to make the best exhaust possible for the most broad power band available.
  • All new exhaust delivers awesome bottom and mid range while still peaking the horse power with that Maximum RPM!
  • KOSOEX50 (50cc & 70cc
  • KOSOEX90 (90cc)
  • Please Call for Prices
  •           
- Gauges -
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  • DELUXE DIGITAL METER
  • Measures engine rpm, max rpm, temp and run time.
  • Over-rev and over-heat warning lights.
  • Works on both 2-stroke and 4-stroke engines.
  • Easy to read back light LED display.
  • BA002150 (back light LED)
  • Please Call for Prices
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  • CYLINDER HEAD TEMPERATURE SENSOR
  • Can be used with the Deluxe Digital Meter for reading cylinder head temperature at the spark plug. Installs in seconds and plugs directly into the digital meter's wiring harness.
  • Recommended when purchasing the Deluxe Digital Meter.
  • KI000R14 (50cc & 90cc)
  • Please Call for Prices
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  • STANDARD DIGITAL METER
  • Measures engine rpm, max rpm and run time.
  • Works on both 2-stroke and 4-stroke engines.
  • Great for setting up clutches and gearing with no battery needed and no need to mount to ATV.
  • BA002000
  • Please Call for Prices
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  • DIGITAL SPEEDOMETER
  • Digital speedometer mounts on handlebars and sensor reads from rear rotor or sprocket. Some modifications required. Also has odometer and trip meter.
  • BB002B10
  • Please Call for Prices
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  • ANALOG RPM GUAGE
  • Reads up to 14,000 rpm.
  • Carbon fiber face plate.
  • Includes all hardware to mount on handle bar clamp.
  • BA480B01
  • Please Call for Prices
- Intake & Carburetor -
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  • RACING INTAKE for 28-30mm carburetor
  • For use with larger carburetors, comes complete with both single and dual stage reeds, stuffers, gaskets and reed cage. Most advanced intake design with Teflon coating for smooth fuel flow and MAXIMUM RPM!
  • DP014000 (50cc & 90cc)
  • Please Call for Prices
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  • CARBON FIBER REEDS
  • Lighter for better throttle response.
  • Durable to withstand higher RPMs.
  • Use with stock OEM intake or Koso racing intake.
  • DJ000K0330
  • Please Call for Prices
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  • DUAL STAGE REEDS
  • Better bottom end response and top end power.
  • Use with stock OEM intake or Koso racing intake.
  • DJ014K0331
  • Please Call for Prices
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  • FLAT SLIDE BIG BORE CARBURETOR
  • This carburetor is a must for maximum gain from your hi-performance exhaust and engine. Grabs more air and has better fuel atomization for the absolute best performance.
  • DA928001 (28mm for 50-70cc)
  • DA930001 (30mm for 80-125cc)
  • Please Call for Prices
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  • RACING THROTTLE CABLE
  • Required when installing 28mm & 30mm carburetors.
  • This cable will not operate oil injection, premix fuel must be used.
  • AJATVR000
  • Please Call for Prices
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  • PILOT JET KIT
  • Kit comes with carrying case and 10 different jet sizes ranging from 35-58. Great for the serious tuner who wants the engine to run perfect in all weather conditions.
  • For use with 28mm & 30mm carburetors only.
  • Carrying case and 10 pieces (35-58)
  • DC001000
  • Please Call for Prices
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  • MAIN JET KIT
  • Kit comes with carryig case and 10 different jet sizes ranging from 122-145. Great for the serious tuner who wants the engine to run perfect in all weather conditions.
  • For use with 28mm & 30mm carburetors only.
  • Carrying case and 10 pieces (122-145)
  • DB001000
  • Please Call for Prices
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  • POWER INTAKE DUAL FUNNEL AIR FILTER
  • Hi-performance air filter delivers all the air the engine may need while filtering out even the finest dirt and debris particles.
  • For use with 28mm & 30mm carburetors only.
  • DK150054
  • Please Call for Prices
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  • AIR FILTER WITH COVER
  • Paper style air cleaner with a transparent blue lexan cover to deflect water and mud.
  • For use with 28mm & 30mm carburetors only.
  • DK013B00 (blue)
  • Please Call for Prices
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  • SUPER INTAKE BOOST BOTTLE
  • Anodized blue boost bottle is designed for better throttle response and faster acceleration.
  • Use with Racing Intake.
  • (50cc & 90cc)
  • DT001B00 (blue)
  • Please Call for Prices
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  • SUPER INTAKE BOOST BOTTLE
  • Chrome boost bottle is designed for better throttle response and faster acceleration.
  • Use with Racing Intake.
  • (50cc & 90cc)
  • DT001M00 (chrome)
  • Please Call for Prices
- Brakes -
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  • REAR HYDRAULIC FOOT BRAKE ASSEMBLY
  • (50cc & 90cc)
  • FOOTBRKE
  • Please Call for Prices
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  • BRAKE MASTER CYLINDER RESERVOIR COVER
  • (50cc and 90cc)
  • AR024M20 (chrome)
  • Please Call for Prices
- Suspension -
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  • ELKA 12" DUAL RATE LONG TRAVEL FRONT SHOCKS
  • S = remote reservoir
  • C = compression adjustable
  • ELKA-12SC MSRP
  • ELKA-12S MSRP
  • ELKA-12 MSRP
  • Please Call for Prices
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  • CHROMOLY EXTENDED A-ARMS (LONG SHOCKS)
  • 3 + 2 5/8
  • Includes extended tie rods.
  • Available in silver powder coat only.
  • EXTAARMS (Long Shock)
  • Please Call for Prices
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  • CHROMOLY EXTENDED A-ARMS (STANDARD SHOCKS)
  • 3 + 2 5/8
  • Includes extended tie rods.
  • Available in silver powder coat only.
  • EXTARMSTD (Std Shock)
  • Please Call for Prices
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  • ELKA 16" TRIPLE RATE LONG TRAVEL REAR SHOCK
  • S = remote reservoir
  • C = compression adjustable
  • R = rebound adjustable
  • ELKA-16SCR
  • ELKA-16SC
  • ELKA-16
  • Please Call for Prices
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  • BOLT-IN REAR SHOCK LONG MOUNT
  • ATVA legal
  • (50cc & 90cc)
  • BOLTLNGMNT
  • Please Call for Prices
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  • REAR SHOCK LONG MOUNT
  • (50cc & 90cc)
  • LONGMONT
  • Please Call for Prices
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  • SWINGARM PROTECTOR
  • Protects swingarm from chain wear when using long travel rear suspension.
  • SWNGPROTC
  • Please Call for Prices
- Accessories -
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  • BLACK PRO KILL TETHER CORD
  • (50cc & 90cc)
  • DB015000 (black)
  • Please Call for Prices
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  • RED PRO KILL TETHER CORD
  • (50cc & 90cc)
  • DR015000 (red)
  • Please Call for Prices
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  • WATERPROOF ON/OFF TOGGLE SWITCH
  • (50cc & 90cc)
  • TOGSWITCH (red)
  • Please Call for Prices
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  • AC NERF BARS
  • (50cc & 90cc)
  • ACNERF
  • Please Call for Prices
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  • AC NERF BAR ADAPTORS
  • (50cc & 90cc)
  • ACADAPT
  • Please Call for Prices
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  • CHROME FRONT BUMPER
  • (50cc & 90cc)
  • CHRMEBMP
  • Please Call for Prices
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  • RACE CUT FRONT FENDER
  • Dinli 601 (Diamond
  • FENDRRED (red)
  • FENDRBLU (blue)
  • FENDRBLK (black)
  • FENDRYLW (yellow)
  • FENDRWHT (white)
  • Please Call for Prices
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  • FLAME GRAPHICS
  • Dinli 601 (Diamond Back or Beast)
  • GFREDYLW (red/yellow)
  • Please Call for Prices
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  • CHROME KICK STARTER
  • (50cc & 90cc)
  • PB014M10 (chrome)
  • Please Call for Prices
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  • STEEL SPROCKET
  • (50cc & 90cc)
  • SPRKTF13 (front 13T)
  • SPRKTF16 (front 16T)
  • SPRKTR28 (rear 28T)
    SPRKTR28 is currently out of stock.
  • Please Call for Prices
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  • HANDLE BAR ENDS
  • (50cc and 90cc)
  • AN906H00 (cherry red)
  • Please Call for Prices
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  • BLUE BILLET ALUMINUM THROTTLE COVER
  • (50cc & 90cc)
  • ALATVB10 (blue)
  • Please Call for Prices
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  • CHROME BILLET ALUMINUM THROTTLE COVER
  • (50cc & 90cc)
  • ALATVM10 (chrome)
  • Please Call for Prices