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portuncia

smoking at half throttle

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portuncia
had some issues when I first got it but ever since been running with very little smoke, oh its an old cast iron B&S 12 hp. This weekend I got a new, to me, sickle bar going on it, having to run the attachment at half throttle I noticed a good bit of smoke. Is this an easy diagnosis when it smokes at half or reduced throttle. Any ideas? Thanks

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Brian313
I pulled apart a 12hp B&S last night that smoked under a load and above half throtttle. As bad as it was smoking thought sure broken or stuck rings, but after getting it apart the only thing wrong was the exhaust valve guide is worn out. It was full of oil all the way to the top of the valve. Getting an estimate tommorrow on cost to fix.

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