[Anonymous]

Short flex = more top/bottom end power
Long flex = flattens the power curve out and lets the engine pull harder in the mid-range

Use short flex when you’re running on a track with a long straight or tight curves and you’re revving the engine hard.

Use a longer flex when the track is more flowing.

In Sr. we almost always use a short flex.

[Samir Shah]

Thanks. I’ll have my son test both flex, and see if he can make out the difference. Since we’ll have a restricted header, it could be interesting.

On a related note, is the silicone sleeve over the flex needed? Can I use either nothing, or header wrap? I see exhaust gas leaking from that area, will it make a difference?

Thanks again.

[Anonymous]

The sleeve isn’t needed but it’ll help keep the back of your kart clean rather than covered in oil from the header.

It won’t make any difference.

[Author]

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