Cut off the indexing tabs and spin your pre-2018 KTM’s Mikuni carb.

Dear MXA,

I’m a new owner of a 2017 KTM 250SX. Reading the review of the newer models, it says that KTM reduced the angle of the carb by 7 degrees. It looks like the carb boot, and the intake flange are the same on my 2017 as on the 2018–2019. How do I change the angle? Is it worth the effort?

According to KTM R&D, this change was originally introduced on the 2018 KTM 250SX. In 2018, the angle of the carburetor going into the reed cage was positioned at a 7-degree angle to the right. This fact alone doesn’t mean much, but on your 2017 KTM 250SX, the carb was positioned at a 12-degree angle, which means that if you looked at the 2017 carb versus the 2018–2019 carb from behind, it would be rotated about 5 degrees closer to straight up-and-down than the old carb.

Why? To keep the fuel in the float bowl in the proper pickup position. On your 2017 model, all you have to do is cut the rubber tabs that index the angle of the carb off the rubber intake boot and then turn your carb by hand before tightening the hose clamps. Or, you could buy a 2018–2019 carb intake boot.

The 2020 KTM 250SX two-stroke inside the MXA studios.

The 2018 KTM 250SX.

MXA’s Assistant Editor, Josh Mosiman on the 2020 KTM 250SX.

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