Bergfelt Racing Enterprises, LLC
4412 W. 6th Avenue
West Mayfield Boro
Beaver Falls, PA 15010-1915
(724) 462-7440

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Updated 1/22/2014

Kid Karts and Comer C-50 and C-51Engines

Bergfelt Racing Enterprises, LLC is the source for Kid Karts and especially Comer C-50/51 engines, parts and services.

Yes, we do sell Comer Engine Parts.

Please call or e-mail to order. We prefer to offer parts in that way so that we can provide you with personal service and expert advice.

Call 724-462-7440 or e-mail


Comer Logo

Our Kid Kart Engines are winning races from coast to coast and border to border.

They have also taken checkered flags in the United Kingdom, Kenya, Ecquador, and Columbia.

We congratulate the drivers below for their fine performances!


At the 2013 Kid Kart Nationals

8 of the 26 racers who made the final in the Unrestricted Class were our customers. Three of them had podium finishes (1st, 2nd and 5th) and one set the track record!. Congratulations to all of those drivers and Thank You for trusting us with your engines.

See video of Kid Kart Nationals Unrestricted Final


January 21, 2014

Hello Mark,

Want to thank you for the great engines and tuning advice that you provided our team. Nicholas had a great year winning 9 races, including the year end 25 lap race at Snydersville Raceway. Alison also had a great season winning in the Kid Kart Rookies at Snydersville and winning again at Shellhammers Speedway in her first year of racing.

Thanks Again,
Will Rindgen



Ben Maier

January 19, 2014

I am the 2013 Nicholson Speedway track champ for Kid Kart! This trophy is bigger than me! I want to thank Mr. Aaron from Excel-Racing for the great support and Mr. Mark from Bergfelt Racing for the great power. 2013 was so much fun. I love hanging out with all my pals at Nicholson Speedway on race weekends!

Benjamin Maier



Miles Murray

December 5, 2013

Hi Mark,

Just wanted to drop you a note and thank you once again for all your help this year. The engine work you provided us was flawless and made my job much easier. Miles won 10 feature races this year and won the Rookie Kid Kart Championship at King George Speedway. We are looking forward to running the unrestricted class next year using the strong motor you provided.

Have a safe and happy holiday season.

Scott Murray
SJM Pro-Grounds


ryder say

May 21, 2013

Mark,  Here is picture of Ryder Say (5 years old ). He has two feature wins in a row at Slippery Rock. Kart is scarey fast. Runs great no problems of yet. Thanks for a great engine and the racing advice on kart set-up! I'll keep you posted on future season results.

   Thanks Again, Scott Say



Kade Brown


Kade won the GCKI Kid Kart Track Championship this year and the motor was strong all season. Very consistent and the bumper is great too. Your support and advice was a great asset.
Thanks for all the help and we are looking forward to next season.
Kenny Brown

(Fulshear, Texas)





Owen Mahle

Owen Mahle at Barberton, Ohio

July 16, 2012

Mark –

Had a good day yesterday. We’ve been running up front but yesterday Owen grabbed a win. Thanks again for a great motor. We couldn’t have done it without you.


(Ravenna, Ohio)


Dalton Bavaro

Dalton Bavaro

March 6, 2012

Thanks so much for all your help last season with our kid kart. Hopefully we can do the same thing this season.

Jason and Dalton Bavaro


(Midlothian, Virginia)

Lucas Rodriguez

Lucas Rodriguez

Hi Mark,
Here are some pictures and a link to the video of Lucas' recent wins! (click picture for link)

Thanks for all your help again

Lucas has won 2 races at Homestead Karting with the help of your B.R.E. blueprint engine! Not only did he win both races by quite a lead, but the engine passed tech without a hitch! This is also Lucas' first season participating in the FCKS Series in Florida. He placed third in the last race in Orlando, again with the B.R.E. engine!

Your customer service is incredible ... Thank you for all your help!

David Rodriguez

(Miami, Florida)

May 2012

Jacob Putnam

Jacob Putnam

See Jacob at the 2011 Indy Kart Classic

See Jacob at King George Speedway

See Jacob at the Kid Kart Nationals

February 13, 2012
Jacob had a great rookie year finishing 1st in points at Old Dominion Speedway and is 2011 track champion, 2nd in points at King George, 8th at the Kid Kart Nationals and 7th at the Indy Kart Classic, all at the ripe age of 5. This was his first year karting and all done with a blueprinted Bergfelt Comer C-51 which passed tech with flying colors!

Vince Putnam

(Centerville, Virginia)

Jo Nunez

Click on Picture to See Jo Nunez in action at Homestead.

"Hi Mark,
First of all THANK YOU for helping us out and taking a million calls on Saturday!
The motor ran great....
...What do you think for motor #2?
I am glad we found you and your services!

pp. "


(Miami, Florida)


Colton Mattocks

Colton Mattocks

October 12, 2011

Thanks for an awesome season! Colton won the Slippery Rock Raceway
Kid Kart Point Championship with 6 straight feature wins. (18
straight wins if you include the heats). Colton also won 4 out of 5
Features at another track with our older B.R.E. motor. 10 Feature
wins in 2011. No doubt, Bergfelt racing engines are the answer for
anyone wanting to run Kid Karts competitively.

Thanks again,
Mont Mattocks
Colton Mattocks -69M



Andrew Schultz

Click on picture to see Andrew Schultz in action.

Andrew Schultz

Hi Mark

Here is some pics of Andrew. Thanks again for all your help!!!!

Jim Schultz

(Warminster, Pennsylvania)

October 6, 2011


Michael Lutz Jr.

Michael Lutz Jr.

Winner at Good Hope Speedway 9/17/2011

It looks like Michael Jr. is following in his father's and grandfather's footsteps.

Mike Lutz Racing

(Mercer, Pennsylvania)

Jayla Persinger

Jayla Persinger


Hey Mark,

We won again at Slippery Rock yesterday, that's two in a row now at SR. There where 5 other kid karts in her class and she started the feature in the very back and fought her way through the traffic and won.

Thanks for some awesome engines Mark!!

Jason Persinger

(Grove City, Pennsylvania)


Noah Eisenhower and his dad

Noah Eisenhower


We were able to get 10 wins this year with your motor without any issues….We were able to win our second Kid Kart Track Championship for 2011. I attached a few photos….We are running up against a Briggs 206 Animal and can still be competitive.
Thank you for your help!

Gary Eisenhower

(Freeport, Illinois)

Jason McGill

Jason McGill

(Plattekill, New York)

Austin DeLong

Austin Delong

(Bridgeville, Pennsylvania)



JJ Metheny

(Forestville, Pennsylvania)

See JJ's brother Chase at the Columbus Ohio indoor races.


David Neuman

David Neuman

(Bellevue, Ohio)

Zac Fowler

Zac Fowler

(Huntsville, Alabama)

Bergfelt Racing Enterprises,LLC Comer C-50/51 Engine Customers are requested to send their "winner's circle" pictures for inclusion here.

Yes, we do sell Comer Engine Parts.

Please call or e-mail to order. We prefer to offer parts in that way so that we can provide you with personal service and expert advice.

Call 724-462-7440

or e-mail

Comer Engine

Zac Fowler

(Huntsville, Alabama)

Zac Fowler

(Huntsville, Alabama)


At Bergfelt Racing Enterprises, LLC we can supply, re-build, and blueprint, 50cc Comer engines and tune them on our dynomometer. We can also give your Comer 50cc engine our Outlaw treatment for competition on tracks with very loose rules.

Click here to view exploded view of the Comer C50 engine.


Top Kart Kart Kid Karts

We can have a brand new kid kart shipped right to you or you can arrange to pick it up. We are offering this kart in red or blue. It comes complete with stock engine, seat, wheels and tires. Some assembly is required.

$2,995.00 (plus freight which varies depending on the destination)

Thinking about buying a new kart and all of the gear?

Although Bergfelt Racing Enterprises, LLC specializes in engine preparation, and does not try to be a warehouse that stocks every karting item, we do have good relationships with many wholesale karting items suppliers. Since we don't have to cover the cost of stocking items, if you supply us with a list of items that you want we will be happy to save you $$$ with a package deal. Just call and ask.

Top-Kart Kid Kart Chassis



Comer C-50/51Tech Tips

Click here to learn the correct way to remove the flywheel from a Comer C-50 engine.

Click here to learn about the benefits of truing the C-50 cylinder.

Click here to learn about the benefits of cutting down the C-50 flywheel fins .

Click Here to learn how to tune the Dellorto carburetor found on Comer C-50/51 engines.

Click Here to learn how to identify which ignition your Comer C-50/51 is equipped.

Suggested Stock Appearing Engine Rules




Now available the Bergfelt Racing Enterprises, LLC

Clutch Hub Removal Tool



removal tools

Our very popular flywheel removal tool is pictured on the left and our new clutch hub removal too is pictured on the right.



Available Now is the Bergfelt Racing Enterprises, LLC

Wrist Pin (Piston Pin) Removal and Installation Tool.





piston pin tool

This picture shows a piston pin being easily removed with our piston pin removal tool.

Our tool makes the often awkward installation of the wrist pins in Comer C-50 and C51 engines easy.



Complete Engine Prices

Comer Logo


Stock Comer C51 Engine $850.00


Just want a factory fresh engine at a competitive price, this is it.


Blueprinted C51 Engine $1185.00


This is the engine to have when it has to be "legal".

Includes extra jets, oil, fabric air filter, dyno tuning, even shipping in the lower 48 states...a complete package.


Our Specialty
The Bergfelt Outlaw C51




You can pay more but you won't get a better engine. These killers earned their reputation with exceptional torque but in the Summer of 2013 we made a break-through in development and now these engines turn higher top end revs too!

If the only rule is "it just has to be a Comer" this is the engine that gets the job done.

Includes extra jets, oil, fabric air filter, dyno tuning, even shipping in the lower 48 states...a complete package.

For International orders the customer is responsible for shipping, import duties and VAT. We do not include oil in overseas shipments.



Comer C-50 Engine Services


Basic Rebuild


This is just what you may need if your engine is not running quite as well as it used to.

This service consists of disassembly of theengine, inspection of all parts, service and replace parts as needed, precisionassembly with double row self-aligningmain bearings and test run and tune on our dyno.

$205.00 PLUS PARTS and shipping.

With Outlaw prepping the clutch
(cut clut shoes and replace springs)
Note this is not WKA legal

$248.00 PLUS PARTS


Blueprint with Rebuild

This may be just what you need to become more competitive.

When blueprinting we will rebuild your enginein such a way as to get the maximum performance
allowable by WKA rules or by the rules at your track or club.The treatment includeseverything done in the basic rebuild plus, we will true the cylinder to be square with the crankcase and to maximize compresion to the legal limit, and our complete bag of legal tricks.

$270.00 PLUS PARTS and shipping.

With Outlaw prepping the clutch
(cut clut shoes and replace springs)
Note this is not WKA legal but some tracks and clubs do allow it. Check your rule book and let us know.
$313.00 PLUS PARTS

If your track or club does not use WKA rules, please supply us with the rules that you are using so that we can study them and build you the best engine possible under your rule set. Kid kart rules are different everywhere.



Rebuild with our Outlaw Treatment

We suggest this treatment for competing on tracks
with very loose rules, or no rules at all. If there is no tech, this is what you need.

We forget about the rule book for this one.This includes everything that we do in our other
rebuilds but we also cut the clutch shoes fora higher stall speed for faster pick-up,we do some reshaping of the ports, a little trick on the intake, bore the carburetor throat and re-jet the carburetor tocompliment higher air flow through the engine,cut down the flywheel fins for quicker and higher revs as well as faster warm up

Lighten piston and rework the intake and exhaust ports.
We simply apply some of the technologythat we have developed in our Unlimited
class engines to the 50cc Comer.

$340.00 PLUS PARTS
Please call for turn around time.


Other Services and Trick Items

We are hesitant to list these services and items because too many racers will just start buying the single "hot" item that they think will solve their particular problem or propel them to the front. Kart racing does not work that way. The real trick is to make sure ALL of the basics are spot on and to tune and match things up so that every part of the kart is working in harmony with the other parts...including the driver. Please call with your particular challenge so that we can help you solve it in the most practical way without wasting your money on things you don't really need.



Frequently Requested Items

Blueprint your SHA carburetor to WKA/KKN specs... $30

Build your Carburetor to Outlaw Specs.....$60.00

Stock SHA carburetor.....$78.23

Blueprinted Carburetor, comes with 54, 55, 56, 57 and 58 jets.....$125

Blueprinted carburetor with only 1 jet.....$100

Outlaw Carburetor (not recommended for use with a restrictor) comes with extra jets, sizes depend upon the application.... $158.00

Dynamometer tuning...$60/hour. 1 hour minimum.

Outlaw Clutch Preparation (labor only), cut, balance and assemble (springs extra...specify restricted or unrestricted).....$35.00


On all engine services, please call for our current turn-around time. Please note that from the end of April to the end of June our shop is incredibly busy and long delays should be expected. Think ahead and get your engine work done in the fall or eary winter.


Notes About Engine Blueprinting

Here's my take on our blueprinted engines. Unless requested otherwise, I build my "blueprinted" engines to be LEGAL at the Kid Kart Nationals. This is the strictest kid kart engine rule set that I am aware of. I will never make claims like "our blueprinted engines are the quickest, or are hand picked from select serial numbers" or anything like that. What we do is build a solid engine that goes right up to the limits without going over them. They are engines that a competent technical inspector will do a thorough inspection on and still pass. They are meant to be a solid foundation for a kid kart race team. To be successful with these engines the racer will have to learn to tune the engine for varying atmospheric conditions (To help with that read this.) The racer also needs to realize that everything on the kart must be aligned and set-up right to compliment the engine.

One might think that all they need to be "legal" is buy a new engine, take it out of the box and assume it's ok. The truth is, there is very good chance that the engine is not legal according to the rules. In the past year, almost every new engine that I have built had at least one technical inspection item that would not have passed a legitimate inspection. There are a lot of good running "legal" engines being beat by engines that are coming right out of the box. There is probably nothing wrong with the legal engines but there is a really good chance that the combustion chamber cc are too low, and igniton timing too advanced, items that make a huge difference, in those engines that have not been blueprinted.

Josh Wins at AA Speedway

Josh Bergfelt was a winner in his CRG Bambino kid kart. He is sporting a driving suit from Azusa Engineering, Josh Bergfelt was sporting a Vega Helmet, Kart Racewear gloves and neck collar.
All of these items are available from Bergfelt Racing Enterprises. Ask for a price quote for anything for kid kart racing.

Bergfelt Racing Enterprises is the only source that you need for the kid kart class. We offer parts and accessories that will keep just about any brand of Kid Kart, or any other kart for that matter, on the race track and running fast. Please contact us for all of your kid kard needs.





Kid Kart Clutch Guard

New for 2010 is the Kid Kart Clutch Guard manufactured by Jex Manufacturing.

Jex Logo

Bergfelt Racing Enterprises, LLC is proud to have been a consultant in the development of this fine product. It offers protection that no other guard offers and is very easy to remove and install. One really nice feature is the heat shield. Not only does it block hot air from hitting the driver in the shoulder it can be used to adjust engine operating temperature.

Click Here to learn more about this product.

Call or e-mail for price and availability.

In an email dated March 21, 2010 from WKA Technical Committee Member Bobby Gettys,
"The kid kart clutch guard is ok to be used in WKA races"


New for 2010 is the Kid Kart Clutch Guard manufactured by Jex MaJex Hubnufacturing.


Jex Logo

The Shark Fin Floating Sprocket Hub from Jex Manufacturing is a must for kid karts. It drastically cuts down on unnecessary chain drag. Jex also make a really nice floating brake rotor hub assembly. Both of these products are available for kid kart axle sizes.

Call or e-mail for price and availability.


Maximize your driver's safety with the LCD Fab

Liquid Containment Device

Click here to learn more about this product.




We accept
credit cards

Official PayPal Seal

Call or e-mail to request a pay-pal invoice.

BRE Logo


Bergfelt Racing Enterprises, LLC
4412 W. 6th Ave.
West Mayfield Boro
Beaver Falls, PA 15010-1915