Well sounds like you need to get your bike moved to a bike specialist cos the car guys you have seem to be unfamiliar with bike problems. The XT is not complex BUT it is very different to any car engines ever made. A Quad expert can help cos the Raptor uses the XT660 engine. Dont risk staying with a car guy cos if he has no experience then he may never sort it out.

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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....