Question about Briggs & Stratton Lawn-Boy Insight Series 21-Inch 190cc 650 Series Gas Powered Engine Variable Speed Self-Propelled Lawn Mower

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I have a Troy-Built Series 550 mower with a Briggs & Stratton engine. I cannot find the drain plug. Is there a good diagram available?

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Most professional shops no longer drain the oil through a drain plug because of all the covers under the engine. With your Briggs and Stratton engine, the best way is to drain through the dipstick. You can purchase a suction device to **** out the oil, or you can drain it. To drain, place you mower on the tailgate of your truck, or on the picnic table. Grab a drain bucket, remove the dipstick and tilt the handle to the ground. The spark plug should be pointed straight up into the air. Might be a good idea to do a test run before removing the dipstick, so you will know exactly where to hold the bucket. All 20 ounces of oil will drain through the dipstick in about a minute if the engine has been warmed up. Refill with a good quality SAE HD30 weight motor oil. Remember...only 20 ounces. Check the oil level after filling before you start the engine.
Good luck.

Posted on Sep 08, 2010

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You have to tip the mower sideways and the drain plug is above the blades on the underside of engine. It's easiest to use a 3/8 drive ratchet with an extension to loosen the drain plug that typically has a 3/8 square recessed hole.

Posted on Sep 08, 2010

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