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My engine is a TCM E-225. It's obsolete now but it is the forerunner of the modern O-470. My engine seems to need quite a bit of prime, about 5 seconds after the fuell pressure peaks. On cold days it like double that.
If you can see your carburetor you can see the diaphragms at the seams. The new style diaphragms are red, the old ones are black. As I said they are expensive. Read up on them and you can verify my story. always leave the mixture rich and the throttle in when you put her away.
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