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Showing results for tags 'atv150-b'.
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Recently swapped a good top end with a bad drive output onto a engine with a bad top end but with a good drive output. Engine 1 (bad drive output), top end was perfect and always ran good for me. Engine 2 (good drive output), top end was toast but it has a output. I swapped engine 1's top end onto engine 2. Didn't take the rings off all i did was everything from the piston to the valve cover. Sleeve, cylinder, valve system, cam, whole top end. Now that engine 1 is on engine 2 it runs good. Doesn't burn any oil, SOMETIMES.. i went on a fairly decent ride without burning a drop of oil then at one point i noticed i was burning it like a steam train. Drove off a bit more and it was like nothing happened?? It all happened on flat land. Im not overfull on oil. Any suggestions? The rings were untouched and are in their original cylinder. They did come out of the cylinder at one point.