I'm learning to wheelie. 1st gear (power) and 2nd (clutch) works, though I'm far from an expert.
It feels that, given time, I could learn to wheelie in 2nd gear and change to 3rd, but is it possible to wheelie directly from 3rd? It feels too weak.

Theoretically speaking, if you can get the bike stood up in first (or second), you can go through all the gears on the back wheel.

Trying to do a 'clutch wheelie' in third is probably asking a little too much of the clutch and gearbox - the bike won't thank you for it in the long term!

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I suspected as much. Thanks for the input.
I will keep at it, and invest into some crash protection.

Well sure but you need also to invest in clutch, chain and sprockets too so er whats the point???

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(Now sold on, sob) 2011 Blue XT660X with gold wheels, was 26,500 km.
Engine mods: K&N Stage 1 filter, DNA Stage 2 filter, snorkel removed, Kev fuel mod fitted.
Plus: smoked Puig screen, Yam aluminium sump guard, Yamaha / Acerbis handguards, Givi Trekker aluminium side cases, Leo Vince X3 cans plus Kev front fork mod and Fender Xtender. Just fitted Michelin Road Pilot 3 tyres.

SOLD the XTX for a Super Ten 1200. And just bought a Raptor 700 so staying on here for some tips....

Sorry, meant to say, keep at training at wheelies, not using the 3rd for wheelies.