Flatslide carburators simply work better and mix fuel/air more accurately than round slide carbs. We have spent many hours testing and perfecting these carbs for use in Norton twins. We designed the needles in house to match specific requirements for Nortons. Ideal main jets have been selected. Idle jets are checked and/or custom drilled in house for smoothest running. A custom lever is added to the right hand mixture screw for accessibility (see photo above). You can use your your original twist grip or opt for our 1/4 turn twist grip and upper cable. Your Norton will generally start 1st kick, run much smoother and stronger than it ever did with Amals and stay adjusted without fuss. (see carb adjust video).

It is not necessary to remove the stock aircleaner backing plate - see photo below.

CUSTOMER TESTIMONY

"Hey Jim,
Just wanted to give you an update. I had the carbs synced so they open evenly and the bike is running like a top.  It is so smooth and the power just keeps coming on until redline which is nice for a change as opposed to the old single Mikuni. You definitely are an asset to the Norton community and provide quality products, and the best customer service." Jared

"I have had Jim Schmidt's 32mm PWK flat slides for about 18 months now. Prior to these I had twin Amals and a single Mikuni 34. I will never go back to either. These flat slides are fantastic. They start like any other well set up carb(s), first or second kick to get fuel drawing. They idle perfectly like a rock. They FLOW, from right off idle all through mid range and to red line, no hesitation, just keep delivering perfectly jetted fuel/power to my motor. All set to bolt on. Everything already figured out, pilot jets, needles and needle positions, and main jets. Honestly, this is a no brainer. Just get them if you are looking for a fabulous set of twin carbs for your Commando." John (taken from the Norton Access discussion group).

"Just spent most of the day riding after setting the carbs up, it has totally transformed the bike. Awesome!!!! is all I can say, now just have to watch the rear tire wear.!!! Thanks again Jim great way to get the most out of the bike." Michael