Johnson had to ease his pace slightly on the final 37 and ¾ miles when his Kawasaki suffered an oil leak but after two retirements from the two races held so far, he held on for a good second with John McGuinness completing the podium places in third.
Earlier in the day Dunlop had made it two wins from two at the 2013 Isle of Man TT Races when he took the opening Monster Energy Supersport race, the day after his stunning race win in the Dainese Superbike Race. Riding the MD Racing Honda, Dunlop took the lead at Ballaugh on the opening lap from brother William and with a 127.525mph lap on his second lap, he caught Bruce Anstey on the road and eventually took the win from the Kiwi by 10.3s.
It was the Kawasakis of Johnson and James Hillier that led in the early stages of the Superstock race, the former holding a one second advantage over the latter at Glen Helen on the first lap with McGuinness a further second back in third. Michael Dunlop was a further 0.75s adrift in fourth but by the end of the lap he’d worked his way up to second.
Johnson’s opening lap of 129.215mph gave him a 4.8s lead though and it was Guy Martin who was up into third, McGuinness down to fourth with Dean Harrison riding superbly in fifth. Hillier had slipped back to sixth with Bruce Anstey, Michael Rutter, Steve Mercer and William Dunlop completing the top 10.
Local man Conor Cummins was an early retirement while Josh Brookes also pulled into the pits to make adjustments to his chain.
Lap two and Johnson continued to lead but the gap was slowly shrinking and when they came into the pits for their fuel stop, the difference was just 1.5s, both riders lapping in excess of 129mph. Martin did the same as he held onto third from McGuinness, Harrison and Hillier but the Tyco Suzuki rider was hit by a 30s speeding penalty as he left pit lane dropping him down the order.
Johnson wasn’t going to just hand the place to Michael Dunlop, the man of the week so far, and he showed his Mountain Course prowess on the third lap when he doubled his lead to three seconds as they headed into the final lap.
Martin’s challenge, which had been effectively ended by the penalty, came to a halt for good at Glen Duff on the third lap and so McGuinness was secure in third with Harrison likewise in fourth, the youngster on course for his best ever TT result.
As the fourth lap unfolded, Michael Dunlop hit the front for the first time, his margin of lead at Glen Helen just 0.137s but, with his foot having slipped off the pegs at Union Mills, Johnson’s charge for victory was all but over. Indeed, when the riders swept round Ramsey Hairpin for the final time, Dunlop’s lead was almost three seconds and this became seven through the Bungalow.
Dunlop was setting a scorching pace and as he took the chequered flag, his final lap was confirmed at 131.220mph, comfortably inside the previous lap record of 130.741mph set by Ian Hutchinson in 2010 and just three and a half seconds outside McGuinness’ outright lap record set on Saturday. His final winning margin was 16.4s with Johnson still delighted with second having pushed Dunlop for as long as he could.
McGuinness took a strong third, his 38th TT podium in total, with Harrison claiming an excellent fourth whilst Anstey edged out Hillier for fifth, the Kawasaki rider slipping back on the final lap as he began to lose power.
Steve Mercer took a superb eighth place, being the first privateer home in the process, with William Dunlop and Ben Wylie completing the top 10.
The results mean Dunlop comfortably leads the Joey Dunlop Championship on 75 points followed by McGuinness (45) and Anstey (39).
With perfect conditions on the Island, the Supersport race got underway as scheduled at 10.45am and it was William Dunlop who led through Glen Helen on the opening lap, his advantage over Anstey 1.6s, with Michael a further 0.1s back. Indeed, it was tight all the way down the leaderboard with less than four seconds covering the top 10.
On the run to Ramsey though, Michael turned his deficit into a 1.5s lead, with Anstey now in third, a further 0.5s back from William but by the Grandstand, an opening lap of 126.431mph extended his lead to 4.2s. Anstey had moved back into second by two seconds with Cameron Donald in fourth, just ahead of Martin and a flying Harrison.
On the second lap, Michael pressed on and could now see Anstey ahead on the road, his lap of 127.525mph only a fraction outside his own lap record. The lead was now close to 10 seconds with William still holding onto third although the rest of the leaderboard was shuffling somewhat with Martin up to fourth ahead of Donald, McGuinness, Harrison, Johnson on the MV Agusta and Hillier.
As they left the solitary pit stop, Michael Dunlop and Anstey were together and the pair of them had caught McGuinness, Donald and Hillier on the road giving the thousands of fans around the course a tremendous sight and the dice allowed the battle for fourth to go all the way to the line.
The top three positions were all but secure on the final lap, McGuinness giving William Dunlop a brief scare for third as he closed to within four and half seconds although the latter responded to take the final podium spot by over seven seconds.
It all meant Michael Dunlop took his fifth TT victory, equalling the total of his father Robert, with Anstey and William rounding out the podium, the first time the two siblings have shared a TT rostrum.
McGuinness took a strong fourth with Hillier having another excellent ride into fifth as he overhauled Martin on the final lap. Donald slipped back to seventh with Harrison, Dan Stewart and Dan Cooper rounding out the top 10.
--From the Isle of Man TT