Does anyone know of a company that offers a throttle body reboring service for the XT?

Check with your local engineering firms.

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Now have a 2017 S1000XR Sport SE

2006 XT660X - Cat D write off due to someone pulling out on me - Pipewerx carbon fibre exhausts - Snorkel removed and airbox drilled - DNA stage 1 + 2 air filters - Kevs fuel controller mod - Scottoiler V system - Oxford heated grips - HEL braided brake hoses - Wilbers 540 rear shock - Brembo brake pads - AFAM chain and sprockets - Michelin Pilot Street Radial's - Denali DX Xtreme dual intensity spotlights

Im pretty sure ive seen this on offtheroad website.

https://www.off-the-road.de/en/XT-66...re-XT-660.html

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To boldly go where no Tenere has gone before.

I sent mine to a chap in the US, who made a beautiful job of a 2mm over- boring. His website is maxbore.com