Jamie Bryant claimed five wickets as Ouseburn blew Helperby away to maintain a sizeable gap at the top of Nidderdale League Division One.
Mark Spilman was the only Helperby batsman to record double figures as they were skittled for just 78 in 26 overs.
Bryant finished with figures of 5-36 from his 12 overs, while opening partner Dan Lever claimed two scalps.
It took the visitors 12 overs to surpass the target without losing a wicket as Sam Parker (59) notched an unbeaten half century.
Ouseburn hold an 11-point advantage over Darley, who escaped with a three-wicket victory in a battle against West Tanfield.
Tanfield looked to have made a competitive total with Stuart Clark (72) and Adam Hodgkinson (54no) scoring well in a score of 184/4.
Julian Hulbert (4-21) gave the hosts an ideal start to their defence but Brad Stephens' unbeaten 82 proved pivotal for second-placed Darley.
Craig Robinson produced a performance to savour as surprise package Birstwith moved into title contention with a commanding 122-run success over Spofforth.
Robinson was the mainstay of Birstwith's 232/8 which saw further contributions for James Riley (41) and George Hirst (44) while Jim Roberts took 5-63.
Spofforth's reply got stuck in mud following Pat Gannon's (42) dismissal and Robinson signed off with 5/10 from eight overs.
Pateley Bridge are creeping further towards an immediate return to Division Two after a crushing seven-wicket defeat at home to fellow top tier newbies Knaresborough Forest.
Chris Langley's 82 lacked support as Pateley compiled 176 in a first innings dominated by Ben Challis (4-36) and Aaron Brunner (4-27).
Paul Kennedy (47) ad Matt Parker (43no) found batting comfortable as Forest knocked the total off in 30.4 overs.
Elsewhere, Rob Nelson's century was not enough for Bishop Thornton as they failed to defend 186 against Burton Leonard.
Neil Blacken scored 75 in the Leonard chase and capped a five wicket win with three boundaries in his final six deliveries. Sam Crompton also added 47, while captain James Townsend scored 41.
Richard Barratt (110) smashed a century as Hampsthwaite (240) took the point against Alne by 44 runs. Peter Carr's 67 ensured Alne put up a good fist in the chase as they finished on 196/8.
The winning streak continued for Masham in Division Two after claiming a 60-run win over Scotton.
Captain Phil Newton (66) and stumper Bailey McCourt (82) shared a 139-run partnership as Masham made 222/9. Sam Halliday's 71 was the best of Scotton's reply, which ended on 162 as Ben Fielding took 4-36.
Goldsborough got over a top order collapse to strike up 222/9 in beating Markington by 91 runs.
Ben Mackrill crashed six sixes in a run-a-ball 95 before late hitting from David James (44no).
James then took a four-for alongside captain Graham Shorter, who snaffled five as Markington were all out for 131.
The leading pair are now more than 20 points clear of the chasing pack after Raskelf were soundly beaten by Ripley.
Luke Spence crashed 178, an innings that included five maximums, as Ripley's 295/6 was too hot for the third-placed outfit.
Raskelf's Rob Galtrey (86) put up a fight but the end of the innings came with Ripley 52 runs short.
Newby Hall got the better of mid-table rivals Studley Royal 2nds following Grant Leiver's run-a-ball knock of 97.
It took Newby up to 244/8, which Studley (179/5) could not surmount despite Chris Hill's 65.
Thornton-le-Moor moved closer to relegation after falling to defeat against relegation rivals Harrogate 3rds, who are now just three points away from safety.
An opening stand of 172 between Jordan Marshall (111) and Henry Burton (53) sent Harrogate towards 249/6. Thornton were dismissed for 179 in reply, with Simon Pinkney making 54.