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Now that you mention it I did run into a small issue when installing a "big bore" on a older model 50. I do not know the technical names for these parts and areas of the saw, so please bear with me. On the bottom of the cylinder there are "lips" that drop inside the top of the crankcase. The "lips" on the larger cc cylinder were thicker and would not fit inside the crankcase opening. I used a dremel, with a sanding drum, and it only took me a couple minutes to thin those "lips" down and everything went right together. The saw now has hundreds of hours on it with no issues.