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250 SX-F with Electronic throttle body

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I am working on project where we are planning to use KTM 690 Duke Electronic throttle body on a KTM 250 SXF. We have managed to control the electronic throttle body but we are looking for a Intake rubber sleeve that could make the fit between 250 SXF engine and the 690 duke ETB. The rubber sleeve that came with the 690 ETB is slightly larger. The internal diameter of the ETB was 37mm while the internal diameter on the 250 SFX engine is about 30mm. We are looking for a rubber sleeve that would fit these dimension. Anybody with a solution please help with your ideas. Thanks anyway.

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