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Motosport Ratings and Reviews

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A-ARM BEARING KIT

A-ARM PROTECTION

ACCELERATOR PUMP COVER

AIR BOX CLEANER

AIR FILTER BOLT

AIR FILTER CLEANER

AIR FILTER GASKET

AIR FILTER MAINTENANCE KIT

AIR FILTER STATION

ALLEN WRENCH SET

ANTI SEIZE STICK

ANTI-FOGGING TREATMENT

ANTIVIBRATION INSERT

Anti-Glare Insert

BAR AND SUBFRAME STRAIGHTENER

BATTERY CHARGER

BATTERY CHARGER DISCONNECT

BIG BORE GASKETS

BOOT BUCKLE RECEIVER

BOOT BUCKLE STRAP

BRAKE & CLUTCH LEVER SET

BRAKE BLOCK OFF PLATE

BRAKE CABLE GUIDE

BRAKE LEVER ADAPTER

BRAKE LINE CLAMP

BRAKE/CLUTCH LEVER KIT

BUTTON HEAD BOLT

Brake Return Kit

Brake Rotor Guard

CABINET STATION

CABLE LUBRICANT

CALIPER ADAPTER

CAMSHAFT INSTALLATION KIT

CAMSHAFT INTAKE

CARBURETOR PLATE

CHAIN ALIGNMENT TOOL

CHAIN RUB PLATE

CLAMP/BAR COMBO

CLEANING BRUSH SET

CLUTCH COVER GASKET

CLUTCH HUB HOLDER

CLUTCH INNER HUB

CLUTCH INNER HUB AND PRESUURE PLATE SET

CLUTCH LEVER BOOT

CLUTCH LEVER/CABLE BRAKE LEVER

CLUTCH/BRAKE COMBO

COMMUNICATION KIT

COMMUNICATOR BELT CLIP

COMMUNICATOR HEADSET EXTENSION CORD

COMPRESSION TEST SET

CRANK BEARING & SEAL

CV JOINT BOOT KIT

Carburetor Float Bowl

Carburetor Repair Kit

Chain And Sprocket Kit

Chest Protector

Coolant Recovery Bottle

Counter Shaft Spacer

Crankcase Splitter

Custom Graphics

DAMPER ROD FORK TOOL

DASH/SWITCH HOLDER

DASHBOARD MOUNT

DISC COVER MOUNT

DISC COVER WITH MOUNT KIT

DRINK SYSTEM VALVE

DRIVE CHAIN BRUSH

ENGINE PLUG KIT

ENGINE PROTECTION CAGE

EXHAUST PIPE PROTECTOR

EXHAUST SILENCER

EXHAUST SILENCER INSERT

EXHAUST WRAP LOCKING TIES

Exhaust End Cap

Exhaust Heat Shield

Exhaust Packing

FENDER ELIMINATOR KIT

FLASHLIGHT HOLDER

FORK BUSHING KIT

FORK CAP WRENCH

FORK OIL LEVEL GAUGE

FORK SEAL AND BUSHING KIT

FORK SEAL BULLET

FORK SEAL CLEANER

FORK SEAL DRIVER

FORK SEALS & WIPERS

FRAME SLIDER BUTTON

FRAME SLIDER CAP

FRAME SLIDER KIT

FUEL LINE DISCONNECT

FUEL MIXTURE SCREW

Filter Rim Grease

Fork Alignment Tool

Frame Protector

Fuel Control Unit

Full System Exhaust

GRIP TANK PAD KIT

Gas Tank Protector

Generic Background Sheet

Goggle Nose Guards

Green Light Trigger

HANDGUARD MOUNT

HANDGUARD SHIELD

HELMET CAMERA MOUNT ACCESSORIES

HELMET QUICK RELEASE

HOSE REMOVER SET

HOT START CABLE

HOT START CONNECTOR

HYDRAULIC CLUTCH LINE

HYDRAULIC CLUTCH SYSTEM

Handguard Accessory

Heated Clothing Control

Heated Jacket Liner

Heated Pant Liner

Heated Vest Liner

Heim Joint Tool

IGNITION COVER GUARD

Intake Valve Kit

KILL SWITCH STRAP

Knee Brace Sleeve

LICENSE PLATE ACCESSORIES

LICENSE PLATE FRAME

LINKAGE BEARING KIT

MAGNETIC NUT AND BOLT TRAY

MASTER CYLINDER CAP

MASTER CYLINDER EXTENSION

MASTER CYLINDER GUARD

MASTER LINK PLIERS

MUFFLER BOX ELIMINATOR

Mirror Block-Off

Modified Cylinder Head

Neck Brace Accessory

Neck Brace Graphics

Neck Support Collar

O-RING/PIPE SPRINGS KIT

OIL FILLER PLUG

OIL FILTER CAP WRENCH

OIL FILTER STRAP

PANT JERSEY GLOVE COMBO

PILOT SCREW ADJUSTER

PLASTIC CLEANER

PROTECTIVE SHORTS

PROTECTIVE VEST

Plow Blade Part

Protective Jacket

Protective Pants

Protective Shirt

QUICK STRAP REMOUNT KIT

RADIATOR HOSE KIT

RADIATOR SCOOPS

RADIATOR SHROUDS

REED VALVE SYSTEM

REGISTRATION WRAP

REMOTE COMPRESSION ADJUSTERS

RIM LOCK SPACER

RIM LOCK VALVE KIT

RIM/SPOKE COMBO

Radiator Cap Cover

Radiator Lowering Kit

Rear Number Plate

SADDLEBAG SUPPORTS

SHOCK BEARING KIT

SHOCK/MUD GUARD

SIDE PANEL PLUG

SILICONE DETAILER

SILICONE GASKET SEALER

SISSY BAR MOUNT

SMOG BLOCK OFF PLATE

SNAP RING PLIERS

SPARK ARRESTOR END CAP

SPARK PLUG HOLDER

SPARK PLUG WRENCH

SPOKE WRENCH KIT

STEERING DAMPER

STEERING RACE REMOVER

STEERING STEM BEARING KIT

SWING ARM BEARING KIT

SWING ARM BUTTON

SWING ARM SPOOL

SWINGARM BEARING REMOVAL TOOL

SWINGARM EXTENSION

Seal Bearing Tool

Servo Eliminator

Sissy Bar Insert

Slip-on Exhaust

Socket Wrench Set

Speedometer Tuner

T-STEM NUT WRENCH

TAPPET FEELER GUAGE

THROTTLE CAM SYSTEM

THROTTLE CONVERSION KIT

TIE DOWN ANCHOR

TIRE REPAIR KIT

TOP AND BOTTOM END KIT

TORQUE WRENCH ADAPTER

TRANSMISSION OIL

TURN SIGNAL HARNESS

TURN SIGNAL MIRROR

TURN SIGNAL SPACER

Tail Light Converter

Under Roost Protector

VALVE SPRING COMPRESSOR

VALVE SPRING KIT

VALVE STEM PULLER

VALVE STEM TOOL

WHEEL CHOCK KIT

WHEEL TRUING STAND

Wheel Spacer/Bearing Kit

Windscreen Bolts

Windscreen Trim

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Reviews Home > BIG BORE KIT Reviews

BIG BORE KIT Reviews

ATHENA BIG BORE KIT - 490CC

Athena ATHENA BIG BORE KIT - 490CC (2 reviews)product details

Overall Rating:

5 out of 5 stars.

"This kit is amazing! I have it on my TRX450R and I would NEVER go back! Given then only thing stock on mine is the frame, this made the biggest improvement to my bike! I love it! So, if you are"... (read full reviews)

CYLINDER WORKS BIG BORE KIT - 477CC

Cylinder Works CYLINDER WORKS BIG BORE KIT - 477CC (1 review)product details

Overall Rating:

5 out of 5 stars.

"I own a motorsports repair shop,customer brought a TRX-450 in that needed a crankshaft and top-end. Thanks to Motosport we were able to rebuild the motor with better parts than stock and save some"... (read full reviews)

CYLINDER WORKS BIG BORE KIT - 488CC

Cylinder Works CYLINDER WORKS BIG BORE KIT - 488CC (1 review)product details

Overall Rating:

5 out of 5 stars.

"works great easy installation everything was there"... (read full reviews)

ATHENA BIG BORE KIT - 435CC

Athena ATHENA BIG BORE KIT - 435CC (1 review)product details

Overall Rating:

5 out of 5 stars.

"this was a rlly easy instaling it. the performance is rlly nice"... (read full reviews)

ATHENA BIG BORE KIT - 280CC

Athena ATHENA BIG BORE KIT - 280CC (1 review)product details

Overall Rating:

5 out of 5 stars.

"Awesome part. Gave me alot more horsepower and a definately noticable difference in the corners. Overall worth every penny."... (read full reviews)

BBR 88CC FLAT TOP BIG BORE KIT

BBR BBR 88CC FLAT TOP BIG BORE KIT (4 reviews)product details

Overall Rating:

4.8 out of 5 stars.

"This is a good motor for a stock frame, but when used in a BBR Perimeter Frame, it is underpowered. If you plan to do a Perimeter frame, get the Super Pro 88cc, then you can convert it to the 106cc"... (read full reviews)

ATHENA BIG BORE KIT - 290CC

Athena ATHENA BIG BORE KIT - 290CC (3 reviews)product details

Overall Rating:

4.3 out of 5 stars.

"This kit adds huge power. Gave my lacking engine the snap and extra power i needed, it also made it sound better. It costs a little much but i would recommend it to any higher skilled or heavier rider"... (read full reviews)

CYLINDER WORKS BIG BORE KIT - 478CC

Cylinder Works CYLINDER WORKS BIG BORE KIT - 478CC (2 reviews)product details

Overall Rating:

4 out of 5 stars.

"I installed this on my 06 yz450f it looks just like the OEM cylinder i did not install the piston instead i ordered a high compression piston. This bike runs like i added another 10 HP. I have been"... (read full reviews)

ATHENA BIG BORE KIT - 144CC

Athena ATHENA BIG BORE KIT - 144CC (4 reviews)product details

Overall Rating:

3.3 out of 5 stars.

"i got this for my 06 yz 125 and it was definetly a waist of my money...i had to do a top end every 2 races...and then it ended up being a bottom end...i would not reccomend this to anyone...big waist"... (read full reviews)

CYLINDER WORKS BIG BORE KIT - 269CC

Cylinder Works CYLINDER WORKS BIG BORE KIT - 269CC (2 reviews)product details

Overall Rating:

3 out of 5 stars.

"Purchased this kit for my 2006 YZ 250F and it took two tries to get a piston and ring combination that fit (rings would not fit in the grooves) finally sent me a piston that worked but it did not have"... (read full reviews)