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MX-PERFORMANCE.COM Products Are For Closed Course Competition Use Only. Not Intended for Street Use

Unleash all the power your Honda GROM can handle with
the Koso 170cc Big Bore kit.

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SALE!!! 
FREE SHIPPING 
IN STOCK!!! 
 
P# 27-5800 LIST:$344.95  MXP:$305.00 
GROM big bore kit
 
Kit includes:
• Ceramic coated aluminum cylinder
• 61mm bore, 11.5:1 compression ratio forged piston/ring
kit • Top end gasket kit and banjo bolts
(premium fuel required) 
Not legal for use in California on pollution controlled
vehicles, race use only in California

BIG BORE KIT w/4-VALVE RACE
CYLINDER HEAD for HONDA GROM

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 IN STOCK!!!
 
 

if you want your GROM to "scream " this is the kit for you ! 
 
 
 P#27-5810    LIST:$949.95  MXP:$855.00  SALE !!! GET ONE WHILE THEY LAST, $799.00
 GROM 170cc big bore kit with 4-valve Race cylinder head 

Kit Includes:
• Koso ceramic coated big bore cylinder kit forged w/4-valve piston
and gaskets
• Koso 4-valve cylinder head (complete with camshaft, rocker arms,
intake manifold, and all other parts shown in the picture)
• NOT LEGAL FOR USE IN CALIFORNIA ON POLUTION CONTROLLEDVEHICLES,
RACE USE ONLY IN CALIFORNIA. WAIVER AVAILABLE.

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The Koso 4V Cylinder Head kit for Honda GROM® is the ideal engine part to complete the Koso Honda GROM® Big Bore kit.

Because of its unique 4 valve design, the air flow and performance are increased.

This new designed head is the perfect addition for those who desire more power and torque. 

The 4 Valve Cylinder Head Kit features a forged piston,

 stainless steel 24 mm intake valves and 20 mm exhaust valves. Feel the speed!

*Fit only Koso Big Bore kit.

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P#27-5801 MXP:$95.95 
 
61MM Piston/ring kit

KOSO PISTON/RING KIT REPLACEMENT PART 

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P# 27-5804   LIST:$129.95   MXP:$117.00
 
HONDA GROM PERFORMANCE CAMSHAFT 
• The Koso 240° camshaft increases power and
torque compared to the stock camshaft.
• Can be used with a stock engine, or for optimal gains, use with
the Koso 170cc Big Bore Kit.
Not legal for use in California on pollution controlled
vehicles, race use only in California

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P# 27-5811  LIST:$47.95  MXP:$44.00
 
 High-flow oil pump for Honda GROM®
 is strongly recommended for those who upgraded their engine with our 170cc Big Bore kit and 4v Cylinder head.
The addition of this high quality part will increase the oil flow by 40%;
which is a very effective modification that will help prevent engine failure.
Keeping the engine lubricated and cool is very important; whether you ride for fun or for races. 
KOSO GROM HI-FLO OIL PUMP!!!

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HONDA GROM  
P#TBW9150 MXP:$259.00
 
FREE SHPPING!!! 
 
186cc 64mm Bore Kit – Includes Ceramic coated all aluminum cylinder, piston kit, and gasket kit.

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P#TBW9153 MXP:$149.00
 
FREE SHPPING!!! 
HONDA GROM  
 
Oil Cooler Kit
Requires use of above cylinder or similar one with oil in/out outlets 

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HONDA GROM  
 
P#TBW9154 MXP:$389.00
 
FREE SHPPING!!! 
 
186cc 64mm Bore Kit and Oil Cooler Kit – Same kit as above but with an oil cooler kit included

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 HONDA GROM 
 
P#TBW1032 MXP:$69.00
 
FREE SHPPING!!! 
 
64mm Piston Kit

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 HONDA GROM 
 
P#TBW1027 MXP:$16.00
 
FREE SHPPING!!! 
 
64mm Head Gasket Kit

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HONDA GROM  
 
P#TBW1041 MXP:$164.00
 
FREE SHPPING!!! 
 
64mm Ceramic All Aluminum Cylinder.

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P# 27-5805 LIST:$157.95  MXP:$148.00
 
 THROTTLE BODY
• 34mm Throttle body for increased performance
compared to stock 30.5mm throttle body
• Includes all gaskets needed and instructions

 
 
 
PERFORMANCE INTAKE
PARTS FOR HONDA GROM

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P# 27-5806 LIST:$79.95 
 
 
INTAKE MANIFOLD
• Intake manifold port is larger than stock and is size
matched to use with the Koso throttle body
• Includes all gaskets needed and instructions

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P#27-5807 $34.95 
 
 AIRBOX TUBES
• Connecting tube is designed to connect the stock
Grom airbox to the Koso 34mm throttle body
• Intake tube allows for higher air volume to enter the
stock Grom airbox

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 P#27-5809 LIST:$68.95  
 
 
 HURRICANE AIR FILTER
• Increases airflow and offers improved filtering
compared to the stock air filter
• Removable foam filter media can be cleaned
repeatedly
• Replaces the stock Grom air filter

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P# 27-5808 $31.95
 
 AIRBOX TUBES
• Connecting tube is designed to connect the stock
Grom airbox to the Koso 34mm throttle body
• Intake tube allows for higher air volume to enter the
stock Grom airbox

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Supplied with application specific harness for easy Plug and Play
installation – no cutting into OEM wires
• Pre-programmed with 2 maps, one for stock and one for a slipon
exhaust
• Comes with easy to use software and USB cable making tuning
a snap
• Runs up to 8 injectors independently
• TPS Calibration, to account for slight variations between bikes
• Self mapping capability with purchase of optional Z-AFM Kit
• Optional handlebar mounted MAP switch available separately
P# 277-A868
 
Not legal for use in California on pollution controlled vehicles, race
use only in California - waiver available 

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P# 131-11001 MSX 125 GROM ‘14-15 LIST:$399.95
 
 
Maximizes power and fuel economy
• Plug and play installation
• On the fly tuning, no dyno required
• Works with all ECU downloads and all brands of
aftermarket ECU controllers
• Does not interfere with stock ECU operation
• Includes air/fuel ratio gauge (2 1/8” diameter),
wideband controller and Bosch O2 sensor (gauge
mount and O2 sensor bung not included
 
1 Year warranty, will not void any OEM factory
warranties
The AFR+ brings together two technologies within one system to make it the most powerful,
user-friendly tuning device on the market.
AFR+ combines an EFI controller with a wideband
O2 sensor and AFR gauge to provide a user instant fuel trimming ability and feedback about
their vehicle’s state of tune.
The AFR+ can handle all of your fueling needs or compliment ECU downloads and already
installed EFI controllers. The AFR gauge allows you to know exactly how well your tune-up is
performing.
The EFI fueling allows you to control any necessary fine tuning without spending
more money or valuable time.

Metric Only
Not legal for use in California on pollution controlled
vehicles, race use only in California - waiver available 

 

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 BACK ORDER

P#374802  LIST:599.99  MXP:$550.00

Honda Grom (2014) 143cc Big Bore Kit

Bolt on 50% more power!

Take your GROM from Stock 8HP to over 12HP with this easy to install bolt on 143cc Big Bore kit.

This complete kit comes with everything you need for an easy installation.

Takegawa kits come direct to us from Japan are designed to bolt on easily and everything you need is in 1 box:

  • 143cc Big Bore cylinder
  • Piston, rings, pin, clips and gasket kit
  • Performance Camshaft
  • Fuel Controller
  • Spark plug

MX-PERFORMANCE.COM Products Are For Closed Course Competition Use Only. Not Intended for Street Use.

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P#0114121 LIST:$276.00 MXP:$260.00

Honda GROM (2014) - Power Commander Ignition Quick Shifter

This unit allows any single cylinder vehicle to have quick shifter functionality without the need for a Power Commander.

 It comes with “coil cap” style connector (Denso) for easy installation on most late model applications.

 For applications that do not have this style of coil the connector can be removed and the unit hard wired in.

  • Long travel sensor designed to keep unit away from riders boot and from the bikes chain.
  • Sensor is fully waterproof and immune to temperature.
  • Optional remote quickset adjuster allows you to adjust kill times on the fly
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    P#01116049  LIST:$399.99  MXP:$375.00

    Honda GROM PCV (2014) - Power Commander V Fuel Injection Module

    Using valuable data collected from the Power Commander III,

    Dynojet introduces the Power Commander V, the premier tuning system.

    Retaining the famed user-friendly interface, the smaller and capable Commander V not only tunes the electronic fuel injection (EFI), but also the ignition timing.

    These features provide Harley-Davidson Dyna riders with unparalleled access to performance-enhancing possibilities for your cruiser.

    From simple corrections for off-idle hiccups to extensive race level mods.

    Dynojet Power Commander V is exactly what H-D riders need to unlock the potential of their Big Twin Harley engine.

    • PC 5 offers reduced size from PC 3 USB (less than half of the size of PC 3)
    • USB powered from computer (9 volt adapter is no longer needed for programming)
    • 2 position map switching function built in (map switch not included)
    • Gear/Speed input (allows for map adjustment based on gear and speed)
    • Analog input (allows user to install any 0-5 volt sensor and build an adjustment table based on its input such as boost or temperature)
    • With gear position input connected the PCV is capable of allowing each cylinder to be mapped individually and for each gear 
    • (for example: on a 4 cylinder bike with a six speed transmission there could be up to 24 separate fuel tables).
    • Unit has a -100/+250% fuel change range (up from -100/+100%). 
    • This allows more adjustment range for 8 injector sportbikes
    • 10 throttle position columns (up from 9 on PCIIIusb)
    • Enhanced “accel pump” utility (increased adjustment and sensitivity ranges)

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    P# 12-8344BK  VooDoo GROM EXHAUST BLACK

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    FREE SHIPPING!!!

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      VooDoo Grom Exhaust  !!!

    Designed and produced by VooDoo Industries for the demanding motorcycling enthusiast!
    • Mandrel bent stainless steel for a perfect fit
    • Mufflers are finished in either show polish or black with a laser etched VooDoo logo
    • All mufflers include a rebuildable perforated stainless steel baffle core and all clamps/brackets needed for installation

    ←                ←                ←               ← 
    P# 12-8344BK  VooDoo GROM EXHAUST BLACK LIST:$359.99  MXP:$324.00
    FREE SHIPPING!!! 

    —  —  —  —  —  —  —  —  —  —  —  —  —

     →             →            →             →
    P# 12-8344P  VooDoo GROM EXHAUST Polished LIST:$359.99  MXP:$324.00
    FREE SHIPPING!!! 

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    P# 12-8344BK  VooDoo GROM EXHAUST POLISHED

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    FREE SHIPPING!!!

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     FREE SHIPPING

    Grom 125 PRO CIRCUIT T-6 System w/carbon cap

    P#794-0618 LIST:$389.95 MXP:$350.00

     

    Some offroad models may contain emission control devices. Some aftermarket parts may remove these devices. Removal or modification of such devices


    is illegal in the State of California unless used exclusively for closed course competition use ONLY, never to be used on public lands or highways.

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    623507-16-1013   LIST:$289.99  MXP:$260.00 

    FREE SHIPPING

    EVO S Full System - Honda Grom (14-16) 

    The Big Gun EVO Street Series was designed to deliver maximum horsepower & torque gains throughout the RPM range.

    Made from .049 stainless steel tubing & an aluminum muffler canister the EVO “S” exhaust system is much lighter than stock units.

    Our sleek muffler design allows for maximum clearance and ease of installation.

    The muffler is coated black and wrapped in our high temp EVO “S” decal then coupled with our aggressive black end tip to give it that signature Big Gun look.

    All Big Gun exhausts are for closed course use only and are not intended for use on the road.

    Big Gun exhausts are NOT LEGAL for sale or use on pollution controlled vehicles in the state of California.

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    FREE SHIPPING!!!

    Yoshimura

    P#196657 LIST:$530.95 MXP:$ Please call for price...

    HONDA GROM RS-9 Stainless/Carbon Full System

  • RS-9 Parallelogram-shaped muffler
  • Increased muffler volume over stock system, resulting in better throttle response and improved noise cancellation
  • Light-weight muffler construction with carbon fiber end-cap
  • CNC machined muffler bracket
  • Reduced weight over OEM system
  • Stainless steel header and tail-pipe
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    TWO BROTHERS RACING 

    P# 005-3740105-S1 LIST:$529.98  MXP:$440.00 

    FREE SHIPPING!!!

     Honda GROM (2014) S1R Full System – Carbon Fiber

    Description:
    » 10% horsepower increase
    » Reduces weight by 5.5 lbs
    » New carbon fiber material
    » Lightweight spiral-wound perforated core
    » Machined spring retained connection
    » High-performance packing material
    » CNC billet black muffler bracket
    » CNC billet machined outlet
    » Lightweight magnesium end cap
    » Includes a removable P1X power tip

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    FREE SHIPPING!!!

    Yoshimura

      P#196658  LIST:$395.95  MXP:$ Please call for price...

     HONDA GROM RS-9 Stainless / Aluminum Full System

  • RS-9 Parallelogram-shaped muffler
  • Increased muffler volume over stock system, resulting in better throttle response and improved noise cancellation
  • Light-weight muffler construction with carbon fiber end-cap
  • CNC machined muffler bracket
  • Reduced weight over OEM system
  • Stainless steel header and tail-pipe
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    Yoshimura

     P#196670 LIST485.95  MXP:$ Please call for price...

     FREE SHIPPING!!!

    HONDA GROM RS-9 Stainless/Carbon Slip-On - EPA Noise

  •  EPA Noise Compliant
  • RS-9 Parallelogram-shaped muffler
  • Increased muffler volume over stock system, resulting in better throttle response and improved noise cancellation
  • Light-weight muffler construction with carbon fiber end-cap
  • CNC machined muffler bracket
  • Reduced weight over OEM system
  • Stainless steel tail-pipe
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    P#010-6-51B  MXP:$58.95

    The Seven Eighths "SE" handlebars are a high quality replacement for riders that still prefer the crossbar feel.

    The SE bars are available in bends to suit every size bike and style of riding.

    • Made with Pro Taper AS20 aerospace aluminum
    • Shot peened finish to increase fatigue life
    • Full 5mm wall thickness for maximum strength
    • Chemically applied scratch & peel resistant graphics
    • Knurled clutch side for secure grip hold
    • 1/4” cut guides for precise width modification
    • Cold-forged crossbar
    • Stainless hardware
    • Bar pad included

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    Yoshimura

      P# 196671  LIST:$349.95  MXP:$ Please call for price...

    FREE SHIPPING!!!

    HONDA GROM RS-9 Stainless/Aluminum Slip-On - EPA

  • EPA Noise Compliant
  • RS-9 Parallelogram-shaped muffler
  • Increased muffler volume over stock system, resulting in better throttle response and improved noise cancellation
  • Light-weight muffler construction with carbon fiber end-cap
  • CNC machined muffler bracket
  • Reduced weight over OEM system
  • Stainless steel tail-pipe
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    93-0051  LIST:$99.95 MXP:$89.95

    GROM BILLET FOOT PEGS BLACK

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    Fender Eliminator Kit

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     LIST:$149.95  MXP:$119.00

    Yoshimura has always been synonymous with quality craftsmanship, precision fitment, and impeccable quality.

    Our Fender Eliminator Kits are no exception, and they are sure to give your bike the sleek race look that every rider craves.

    These kits feature a precision laser cut stainless bracket that tucks discreetly under the tail section of the bike,

    as well as a premium CNC machined light holder which houses 4 LED lights.

    The light housing is anodized black and laser etched with Yoshimura's logo.

    Completing the kit is an anodized aluminum license plate frame which features a silk screened Yoshimura logo.

    This kit features two, turn-signal mounting locations,

    depending if you are running a Yoshimura Full System, Slip-On, or the Factory exhaust.

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    P# 93-0050  LIST:$99.95  MXP:$89.00

    Honda GROM (2014) Fender Eliminator Kit 

    Description:
    • Turn Signals
    • Plate Light Bolts

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    CAT5 SERIES
    • Anodized FIRST then CNC machined
    from 7075 aluminum
    • You end up with a trick colored
    sprocket with silver highlights
    • Unique tooth design
    • Trusted by champions

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    CAT5 SERIES
    • Anodized FIRST then CNC machined
    from 7075 aluminum
    • You end up with a trick colored
    sprocket with silver highlights
    • Unique tooth design
    • Trusted by champions

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    CAT5 SERIES
    • Anodized FIRST then CNC machined
    from 7075 aluminum
    • You end up with a trick colored
    sprocket with silver highlights
    • Unique tooth design
    • Trusted by champions

     

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           P#  023101  MXP:$34.95

     PRO TAPER® 420MX CHAIN 134L

    • Premium gold series chain

    • Designed for 50cc to 125cc applications

    • Lightweight, ultra high strength chromoly construction with a

    5000 lb. tensile strength

     

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     P#27-5786R  Red  LIST:$47.95  MXP:$44.00
     
     
     THE HONDA GROM
    E./F./G. TOP CLAMP GAUGE BRACKET FOR THE HONDA GROM

    Allows for a quick and easy installation of the Koso Honda Grom
    cylinder head temp., air/fuel ratio gauges or any of the Koso Mini
    3 gauges.

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    P#27-5786S   Silver  LIST:$47.95  MXP:$44.00
     
     
     THE HONDA GROM
    E./F./G. TOP CLAMP GAUGE BRACKET FOR THE HONDA GROM

    Allows for a quick and easy installation of the Koso Honda Grom
    cylinder head temp., air/fuel ratio gauges or any of the Koso Mini
    3 gauges.

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    P#27-5786BK  Black  LIST:$47.95 MXP:$44.00
     
     
     THE HONDA GROM
    E./F./G. TOP CLAMP GAUGE BRACKET FOR THE HONDA GROM

    Allows for a quick and easy installation of the Koso Honda Grom
    cylinder head temp., air/fuel ratio gauges or any of the Koso Mini
    3 gauges.

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    P# 27-5785 Air/Fuel ratio  LIST:$104.95  MXP:$96.00
     
     
    Plugs into the OEM oxygen sensor
    • A/F ratio display range: 12.2:1~17.2:1, display unit: 0.1
    • 12 Volts DC
    • Dimensions: 60 mm x 30 mm x 11.5 mm
     
    • Top clamp or Mini 3 universal gauge mount sold separately

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    P# 27-5747M   Silver   LIST:$14.95 
     
     
    UNIVERSAL MINI 3 GAUGE MOUNT

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    P# 27-5784  Cylinder head temp. gauge  LIST:$99.95 MXP:$94.00
     
     
    CYLINDER HEAD TEMPERATURE GAUGE
    • Shows temperature in either °F or °C
    • Temperature range -4° ~ +428° F in 0.1° increments
    • 12 Volts DC
    • Dimensions: 60 mm x 30 mm x 11.5 mm
    • Peak temperature recall function
     
    • Top clamp or Mini 3 universal gauge mount sold separately

         
         
         

    Copyright © 2000-2015 MX-PERFORMANCE.COM LLC. All Rights Reserved. Product Specs, Pricing, and Availablity subject to change without notice.