Question about Briggs & Stratton Briggs Stratton Vanguard V - Twin Vertical Ohv Engine with Electric Start 23 Hp, 1" X 3 5/32" Shaft, ModelNo. 386777 - 0036 - E1

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24horse vtwin runs good at half throttle seems to lack power.turn on the mower deck and sometimes it runs ok but will not mow normal lenth grass not much power.if i turn the throttle up wide open it will blow black smoke .and start to stall,if i immediately turn the throttle down it will catch up to itself and run smooth.at no load on engine wide open throttle it will run fairly good.

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Sounds like you're getting enough fuel (black smoke) Could be running on only one cylinder. Either stuck valve or loose valve adjustment or one bad magneto. You could try starting with one spark plug disconnected. If it doesn't start, reconnect that one and disconnect the other. IF it runs like it was, then you're running only one cylinder, and go to work on finding out why.

Posted on Aug 05, 2010

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Posted on Jan 02, 2017

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My 25 horse power cub cadet mower starts and runs great until you try to mow with it and it has no power. At half speed it mows fair but in heavy grass no power. Any help app. Bill


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The likely cause of this is that the grass is too high for your mowers deck. You should try just mowing about 1/3 of the blade at a time (if you can) until you reach your desired length, so if you grass is 6" high, only take off about 2" at first to reduce the stress on your mower. Set your mower deck to it's highest setting and give it a shot.

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