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My guess for WAGs suggestion is to see if you hear chuffing, that would be indicative of a blown headgasket. It cant hurt to do another valve adjustment either, i have had strange things happen on brand new tractors...LOL had one engine that had a valve adjuster back out of a rocker arm in 4 hrs run time, straight from the factory.... you may have a similar issue.... or it just backed out enough to cause low compression ...
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