6 Sigma Racing

Our customers are the best!! We received this email from today:
I received your jet kit for my son's Honda crf125f this week. I installed the Yoshi pipe, UNI filter, removed the horn on the airbox and installed your jet kit to a T as you provided and all I can say is WOW! My son's eyes were bigger than a coke bottle and his Momma wanted to go inside! It brought that bike to life. The spade terminal for the D screw air mixture is genius! I didn't cut the slot because it's actually easier to get that in there to adjust while the carb is on the bike than a flat screw driver. Run it thru all throttle stages and checked the plug to the delight of a perfect golden brown like a pancake spark plug with a perfect idle and zero hesitation in throttle response. You guys are amazing and definitely know your s**t! Where can I leave a review on the interweb to voice my pleasure with the quality of your business? Keep up the good work, and thank you so very much!!!

Best review ever: I just wanted to let you know, your jet kit cost me about $2600. My wife has a Kawasaki ZL600 that had been sitting so we were going to put it up for sale. The carbs were completely crusty and taking them out is a HUGE pain because of the factory air box. I decided to go with pods and re-jet to make my life easy. I followed your instructions to a tee and figured I’d try the smaller jets first since it still had factory exhaust. Everything went flawlessly. The bike fired right up and ran like a COMPLETELY different animal. Throttle response is better than I expected and the plugs read perfect. The problem is, now she doesn’t want to get rid of it because it is A BLAST to ride! Thank you guys so much for getting her excited about riding again!! I WILL BE USING YOU AGAIN VERY SOON!!!

2002 Harley Sportster - Screaming Eagle 11 slip-ons, Super E carb, and 6 Sigma Jet Kit. Thanks for letting us set you up, Mike Pyles!!

We love this project from Here is what he told us about this build:
I bought this as a mostly original 1978 Yamaha XS400, with a seized motor. I picked it up for $100. I rebuilt the motor, built my custom frame into a drop seat bobber, and all the other mods for under $1000.
The front wheel consists of a ‘79 Honda XL500 23” rim, with custom spokes mounted to a XS650 hub. I painted both the front and rear wheels. I fabbed forward controls, and changed the clutch from hand/cable operated, to foot/linkage operated. I salvaged one of the original pistons as the hand shifter. I made my own chain tensioner and seat as well. The whip light was added for safety because the bike total height of the bike is 36” tall, with a seat height of 17”. I stripped the tank to bare metal, and painted the center stripe and skulls, then clear coated the whole thing. I ditched the original wiring harness and made my own. Basically, my goal was to do absolutely everything on the bike myself.

The bike was built in my driveway, using hand tools.

Oh yeah, this is my first bike build.

1998 Honda CR250R with FMF full exhaust, Keihin PWK 38mm Air Striker Quad Vent Carb, Boyseen Reeds, custom rebuilt by owner. Thanks for trusting us with the jetting!

Next kit on the bench: ZR1100 set up with stock dual exhaust, baffles removed, and K&N air filter

Yamaha XS650 - Open carburetors, no pods no air box. 1 1/2" x 26" straight pipes, no baffles no muffler, and a 6 Sigma Jet Kit to increase speed and performance.

Thanks Gavin Foster for trusting us with your jetting. We can't wait to hear how the project goes.

We received the chance to put our Engineering Skills to the test on a very rare 1917 Cleveland Vintage. Happy to report we were successful on our attempt to design the Jet Kit correctly with the modern carburetor.

We Design Custom Carb Jet Kits for ANY carbed Bike, Quad, Scooter, or UTV.
https://www.6sigmajetkit.com/

6 Sigma Jet Kit

Custom Building a CB750 Cafe Racer this winter? Running Pod filters and 4-2-1 Exhaust?
We can Help

Honda CB750 Jet Kit Honda CB750 Performance Carburetor Jet Kit Custom Designed to your Exact Specifications at time of order. Add Power and Performance.