Chris Humphrey crossed for John Sutton to fire Motherwell's clinching goal eight minutes from the end.
The visitors were two goals up by half-time, Steven Saunders' scrambled opener added to by John Sutton's header.
Boyd powered home a superb long-range drive eight minutes later, but John Sutton matched that before the break.
Striker John Sutton looked to have scored from the penalty spot after he was fouled by Bledion Guga.
And John Sutton doubled the Steelmen's lead at the end of another enterprising Humphrey run 20 minutes from the end.
Jamie Murphy came on for John Sutton in 57 minutes and made an immediate impact with his forceful, positive play.
Mark McGhee opted for an ambitious team selection, with John Sutton, Chris Porter and David Clarkson carrying the potential for goals.
Goals by Steven Saunders and John Sutton gave Well their win in Edinburgh and ended a run of four straight defeats.
Motherwell responded by heading straight upfield where John Sutton had a header from Keith Lasley's pass turned away by goalkeeper Mark Howard.
Young's side fell 2-0 down in the first half but John Sutton's goal at the start of the second period gave Well hope.
John Sutton's glancing header wide from a McLean cross offered an immediate response, before David Clarkson drove straight at Janos Balogh from distance.
After a goalless first half, the visitors were awarded a penalty just after the break when John Sutton was fouled by Bledion Guga.
Cillian Sheridan doubled the lead in the second-half with a tap-in and John Sutton's close-range strike completed the rout four minutes from time.
Jim O'Brien's first goal for 'Well, a deflected drive, handed them a deserved half-time lead but misfiring striker John Sutton should have made it more.
John Sutton passed up several chances on either side of the interval to restore parity and Michael Fraser kept out a Jack Compton strike for Falkirk.
Pascali's centre-back partner, Scott Severin, cleared Stevie Hammell's dangerous low cross as John Sutton prepared to pounce, while Cammy Bell comfortably held three long-range efforts from Jutkiewicz.
It was the Steelmen who had the game's first attempt at goal, John Sutton stealing the ball from John Rankin before firing into the arms of keeper Stack.
Motherwell had the first serious attempt at goal when Stephen Hammell's corner found John Sutton, who bundled the ball towards goal but Shaun Maloney headed away on the line.
Jim Gannon made a double switch at half-time with Keith Lasley and Jim O'Brien coming on for John Sutton and Forbes, and Jamie Murphy moving to play through the centre.
Murphy and Jennings were both denied in a frantic goalmouth scramble after Shpetim Mocka fumbled Forbes' free-kick and the goalkeeper parried John Sutton's header from a Slane corner and Murphy forced home.
Black sent a 20-yard drive inches over the crossbar before Webster rose to meet a long throw, John Sutton played it back into his path and the central defender fired low past Stack.
'Well sent on John Sutton in place of Esteban Casagolda and the striker's first contribution was to head a long ball on for Forbes, whose volley hit the bar on its way out.
Meanwhile, Forbes had been restored to the Motherwell starting line-up along with John Sutton after club captain Stephen Craigan paid for his own goal in their loss to St Mirren by being dropped along with Jamie Murphy.
Though he failed to firmly convince fans of either of those clubs of his ability, he has been pinpointed as a pivotal player for OB and, as such, John Sutton will be asked to play off the front to 'sit' on Djemba-Djemba, to try to lessen his influence.
The first half ended with both teams making enforced substitutions, Naismith limping off to be replaced by John Fleck and the winded Tom Hateley making way for Sutton.
Former winner Charlie Spedding joins John Inverdale for Radio Five Live's coverage of the Flora London Marathon between 0830 and 1215, with commentary on the elite races from John Rawling, Mike Costello and Chicago Marathon winner Marion Sutton.
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