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Something is definitely wrong! Not knowing what parts you have replaced I must ask if you replaced the camshaft? The VH4D and VF4D cams are physically interchangeable but will not work in the wrong engine due to the differences in the firing angles. Know the Bobcat reasonably well. Note some of them had Stelite exhaust valves and Stelite inlet valves due to the high operating temps in the machine. If you can get a head off in the frame you can check valve timing ie valve rock on TDC on all cylinders. If you can remove the tappet covers and use a feeler rod down the plug hole you can achieve the same result. Or you may be able to do it with a small (dentists) mirror through the spark plug hole. Remember on hand cranking with the wring camshaft or timing set up it may be sucking on an exhaust valve open!!!!! !!!!! !! Work hard – drink less;-) mines a Melbourne bitter. Where are you? I am in Cootamundra NSW. Senlim Oz
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