Kelly had his eye in during Sunday Cup semi-final, shock defeats for top dogs in Peterborough League
Lewis Archer was also on target as the favourites beat Glinton & Northborough 4-2. Callum McDonagh and George Frost replied for the home side.
West Raven will meet Whittlesey Athletic in the final at Yaxley FC next month.
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Hide AdWhittlesey made progress in the Cambs Sunday Cup last weekend with a 2-1 win over Camborne with goals from Aaron Dunmore and Matthew Briggs.
Cardea lost their perfect record in Peterborough League Division Two after 12 straight wins.
They went down 4-3 at Crowland Reserves for whom Harry Grigas scored twice.
There was also a shock defeat for Division One leaders Sawtry who lost 1-0 at home to lowly Long Sutton.
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Hide AdSecond-placed Stanground Sports were also beaten 5-1 at Holbeach Sports enabling Farcet United to jump above them after a 6-0 win over Netherton Reserves as Antonio Dello Russo and Lewis Goodwin both scored twice.
The top three in the Peterborough Premier Division - FC Peterborough, Uppingham Town and Moulton Harrox – all won.
The city side remain in pole position after goals from Talhah Muhammed and Romeo Ugbene secured a 2-0 success over Oakham.
Division Three leaders Peterborough Rangers booked their place in the Junior Cup Final despite having Will Madeira and Claudio Goncalves sent off.
Laureno Da Silva and Dwayne Rankin scored in e 2-0 semi-final win at Uppingham Reserves.