Featured Products

Overbore 421.81cc Piston Kit

Spears Racing Kawasaki Ninja 400 Overbore 421.81cc Piston Kit with Thermal Barrier Crown Coating – 12.8:1 Compression

The Spears Racing 421.81cc Overbore Piston Kit (+2mm) is designed for the Kawasaki Ninja EX400, featuring JE Pistons’ advanced 3-ring FSR Slipper Skirt forging. Lighter than OEM pistons, this high-compression (12.8:1) kit includes:
  • 2 Pistons with JE’s Thermal Barrier Crown Coating
  • Piston Rings (x2 sets)
  • Lighter Wrist Pins (x2)
  • Cir Clips (x4)
  • Custom +2mm Head Gasket (special thickness)
  • Bored and Re-Plated Cylinder with proprietary Nickel Silicon Carbide (NSC) plating

$79.98/$1759.97

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Overbore 339.43cc Piston Kit

Spears Racing Yamaha YZFR-3 Overbore 339.43cc Piston Kit with Thermal Barrier Crown Coating – 13.5:1 Compression

The Spears Racing 339.43cc Overbore Piston Kit (+2mm) is designed for the Yamaha YZFR-3, featuring JE Pistons’ advanced 3-ring FSR Slipper Skirt forging. Lighter than OEM pistons, this high-compression (13.5:1) kit includes:
  • 2 Pistons with JE’s Thermal Barrier Crown Coating
  • Piston Rings (x2 sets)
  • Lighter Wrist Pins (x2)
  • Cir Clips (x4)
  • Custom +2mm Head Gasket (special thickness)
  • Bored and Re-Plated Cylinder with proprietary Nickel Silicon Carbide (NSC) plating

$79.98/$1759.97 

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Kawasaki Ninja EX400 Cooling Kit

Spears Racing/SamcoSport Hose Kits and Cooling Kits

Samco Hose Kits are made by samco sport .The cooling hose kit is a high performance product which replaces your standard factory rubber hoses to a high quality samco Sport silicone hose kit. The samco sport OEM replacement silicone hose kits offer amazing value and exact fitments to improve your cooling system.

Handmade in the UK includes a Lifetime Warranty, ensuring you have the highest quality cooling products fitted to your bike have been race proven around the world as the #1 choice of many racing teams in series such as Formula One, NASCAR, MotoGP and World Super Bike. Samco hoses can withstand higher operating temperatures and pressures than OEM hoses.

SamcoSport hose kits are specifically designed to directly replace your Original Equipment hoses. SamcoSport offers the world’s largest range of direct replacement kit

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Domino Throttle Assemblies

Domino has been producing various products for the world of motorcycle racing for many years. The Products are conceived at the tracks, and are meticulously developed by Domino based on the specific needs of the riders in the various categories.

Reliable, robust and professional products that are used every day by those who have made motorcycle racing a way of life. Whether on-the-track or off-road, the sporty heart of Domino beats proudly in its professional racing products

Quickness = It is the rotation quickness the throttle control can open the throttle body / carburetor with.
Therefore, the lower the value, the quicker the throttle control inside the range of Domino throttle controls. (° / 1mm = The nipple moves by 1 mm each X throttle rotation degree).
Max stroke = It is the max movement that the throttle control can let the nipple do.

Speed ​​= the speed of the control represents the rotation speed with which the control is able to open the throttle body / carburetor. Therefore the lower the value, the faster the command within the Domino product range. (° / 1mm = Every X degrees of rotation of the knob the pawl moves by 1mm).

 

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Spears Racing Motorcycle Titanium Fasteners Kits

Grade 5, also known as Ti6Al4V, Ti-6Al-4V or Ti 6-4, is the most commonly used alloy. It has a chemical composition of 6% aluminum, 4% vanadium, 0.25% (maximum) iron, 0.2% (maximum) oxygen, and the remainder titanium.It is significantly stronger than commercially pure titanium while having the same stiffness and thermal properties (excluding thermal conductivity, which is about 60% lower in Grade 5 Ti than in CP Ti). Among its many advantages, it is heat treatable. This grade is an excellent combination of strength, corrosion resistance, weld and fabricability

 

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Spears Enterprises/Spears Racing  Is the North American Distributor of HM Products.
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CHAIN HOOK/CHAIN HOLDER

The “Chain Hook/Holder”© is an innovative designed By Spears Enterprises/Spears Racing and it is made from 5052 Aluminum Alloy and is tumbled to a silk finish for a fine natural appearance
The Hook/Holder© is to assist the race Team Mechanic,racer or rider once you have removed your rear tire/wheel assembly from your Bike,you no longer need to let your drive chain just fall onto the dirt/asphalt  that can cause early wear to the chain and the drive sprocket

$49.99/$39.99

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BONAMICI Fully Adjustable 32mm offset Clutch Lever With perch designed and engineered by The staff in Italy and is machined from solid aluminum with a foldable lever aerodynamic designed for better airflow – $269.99

 
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Vesrah Brakes is a Japanese company based in Tokyo Japan Their high-performance racing brake pads give you powerful braking at the track and are used by many professional road race teams. This is the pad that started the revolution in braking technology.

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Brembo 107A48651 Z04 Compound

Kawasaki Ninja ZX400rr, the Brembo Racing Z04 compound was developed specifically for racing and designed to provide maximum performance in the most extreme competitions, this material are its high friction and consistent efficiency, especially at high disc temperature $149.99/$139.99

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WHO WE ARE

SPEARS RACING

Gregg Spears is the President, founder and team manager of Spears Enterprises/Spears Racing.

He has 47 years of experience in the motorcycle Industry, including 14 years with the San Jose Police Department as Lead Technician. 40 of the 47 years, Spears has been the leader in motorcycle maintenance, 35 years of motorcycle roadracing support and team management with Spears Enterprises/Spears Racing. Being a dominant racing force in California, Spears Racing has earned several championships at the class, state, regional, national level and World Level and is recognized as one of the first Dynojet Power Commander tuning centers in the world. Spears graduated from high school in 1977 and went to work for the San Jose Police Department as its Lead Motorcycle Technician. It was soon apparent that his attention to detail was valuable to the industry, and decided to start working on motorcycles in his off-hours. Soon he found an overwhelming response to his talents, and in 1980 Spears Enterprises was born with $200.00 and a toolbox. Working from his carport and making house calls, Spears soon found a need for a total motorcycle repair facility.

In 1991 after leaving the San Jose Police Department, Spears Enterprises was opened in Campbell, California. Working as a sole proprietor, business was overwhelmed with customers and soon he had to hire employees to meet the demand of the workload. Long hours and relentless dedication to his customers led the business to grow, and by 1995 Spears Enterprises expanded by opening a second location. By this time the business had established itself as the leader in police motorcycle maintenance, having as many as 12 different police departments relying on Spears to meet their demands.

Working with specific roadracers, Spears Racing became a recognized force in AFM,AMA, CCS, WERA, AHRMA, LRRS and MotoAmerica competitions. Spears Racing has also expanded their efforts to include several racing venues across the U.S. and into Australia, Ireland, Germany, New Zealand, and the United Kingdom winning numerous International Championships while continuing to expand their racing support in the years to come.

In the summer of 2015 one of their Sponsors assembled a racing team called Emerald Roadracing, to run in the coveted race called “Isle Of Man TT.” With long hours and great dedication of rider and team they were able to finish 9th over all in the “lightweight/Supertwins” class on a Spears Racing powered Kawasaki ER650.

Spears Racing has shifted its business focus to manufacturing and supplying high-quality race products for smaller displacement motorcycles, offering a wide range of over 800 products, including championship-designed engine kits and purpose-built race parts. Their dedication to customers’ service and product quality seems to be a key priority.

What our clients say

RHNorth Carolina
Gregg, I wanted to thank you again for your help getting me the head gaskets so I could get my bike back together in time.  I ended up doing those gaskets, swapping to intake cams everywhere and a full Yosh exhaust.  The bike is a rocket ship now!  
Adam FKent, Washington
Gregg, I've use some of your stuff before, but this is the first time I have seen it in quantity. I'm super impressed with your attention to detail. Thanks for all you do, this explains why I have heard your name mentioned for years!
JaimeSilver Spring, Maryland
Gregg, I recently got my hands on the parts that I purchased from you. And I have to say they were packaged very carefully and for that I thank you. I will be installing them soon. It was a great pleasure doing business with you!
義明根木 Hiroshima, Japan
Today, great products arrived safely.  Thank you a lot for stickers and candy.  You gave me a spare gasket.  You guys are the best!  The best bike life begins!
William B Scotland
Hi Gregg Just a quick email to say how impressed I was with your service and delivery to me in Scotland. Got Parts off you a couple of months back . The service and quick response’s with emails were first class. So Thank you very much 
Jan P Norway
Hi Gregg, Thanks for quick response of my order for the Ninja 400. Got the package in my hands 2 hours ago, here way up North in Norway and the order was submitted only three days ago.
Chis A Denver, Colorado
Gregg When I called to tell you about my mysterious engine stalling you were quick to point out that you had a plug’n’play side stand lockout kit for just that situation. As always it arrived in a couple of days and went on in a jiffy. One less thing to worry about while on the track. I can’t tell you how much I appreciate the support that you are providing to my race program, with both your products and your knowledge - you rock!
Jay Mount Gravatt, Australia
Gregg The parts arrived and were installed today, I’m ecstatic. Feels like a totally different bike! Cheers, Jay
Kevin R Elm, New Jersey
Gregg,I cannot thank you enough for all of your help, support and insight. Navigating this crazy race world for a newcomer like me is not easy. It's folks like you who make it so much easier. Cheers! K
Kevin R Elm, New Jersey
Dear Gregg, I ordered a R3 transmission a couple of months ago and I am very pleased with the result.No more dropping out of gear. Rider is more than happy, so thank you!I would like to order another set. Sending the transmission from The Netherlands is quite expensive, so please add a core fee. Looking forward to hearing from you.Kind regards,Met vriendelijke groeten,
Tracy M Tennessee
Gregg, Just got my clutch rod and bearing for my Z400 today. I will tear into it in a couple weeks when there's no chance of a sunny day to ride. You were on the spot with replies and shipping and I appreciate it very much. Thanks again  By the way, did you put candy in with my parts?....good one!!

SPEARS RACING BUILDS ENGINES THAT WIN CHAMPIONSHIPS