Manager David Moyes felt West Ham’s crowd played a big part as the Hammers came from behind to earn a point against Leicester in his first home game in charge.
Marc Albrighton fired the Foxes ahead after Angelo Ogbonna failed to deal with Jamie Vardy’s low cross.
Vardy went close to doubling the lead with a curling attempt before Kouyate got on the end of Manuel Lanzini’s corner.
West Ham, roared on by the home fans, were the better side after the interval but could not force a second goal.
They remain in the relegation zone but are now level on points with 17th-placed West Brom, while Leicester move above Newcastle United into 11th.
‘A tough place to come with a tough crowd’
Moyes described the point as “a start” and said of the Hammers fans: “They got right behind the players and the players gave them something back.”
He added: “The fans were fantastic, after all the negatives we heard, it was the opposite.
“When you come to play West Ham over the years, it has been a tough place to come with a tough crowd and they did that tonight.”
Leicester have taken five points in Claude Puel’s first four league games in charge yet the Foxes boss believes it should be more.
“The only disappointment is that we didn’t win,” said the Frenchman.
“We play well with the ball on the floor, press our opponents well and create chances to score. Now we must start to be more clinical.
“It’s disappointing because we had a lot of opportunities in the first half and we should have killed the game.”
Hammers respond well to going behind
This was a spirited performance from the Hammers which will give Moyes hope of steering the struggling club out of the bottom three.
In the 2-0 defeat at Watford in his first game in charge, West Ham’s heads dropped after conceding in the 11th minute.
Yet there was a determination about the hosts after the Premier League’s worst defence conceded for the 26th time in the league this season.
Winston Reid’s failure to close Jamie Vardy down allowed the England striker to cross. Angelo Ogbonna should have cleared yet lost his footing to allow Albrighton to slide home.
Kouyate headed the first Hammers goal of the Moyes reign from Lanzini’s corner, which lifted the atmosphere inside London Stadium.
West Ham fans spent the second half urging their team forward, substitute Andre Ayew going closest to a second with an overhead kick in stoppage time.
Ayew’s eventful cameo
Although he went close to scoring the winner in the dying moments, Ayew was involved in two controversial incidents after replacing the impressive Marko Arnautovic.
The former Swansea winger appeared to dive to try and win his side a penalty when challenged by Harry Maguire on the edge of the Leicester penalty area.
Referee Martin Atkinson waved play on, although Ayew was booked moments later after a late challenge on Demarai Gray, who was also cautioned for reacting and shoving his opponent.
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Source: BBC Sport