Nick Baker from Minehead was best expert in the Exmoor Club's Easter Monday trial at Bridgetown.
But youth expert class winner Tom Hooper, who was competing on the same route, lost seven marks less in the three-lap, 12-section event at Chilly Bridge.
Baker lost most of his total in the sixth section where a 45 riders were confronted by a rock step. After losing three marks on his first lap, Baker stopped on his two remaining visits.
Hooper, who had suffered a stop in the third section, jumped the step on his first lap and escaped penalty, but pioneering a new line the Porlock teenager failed to clear the hazard on his second lap.
Fresh from his success in the South West Association's two- day trial, Ian Baker was best clubman on a slightly easier route.
He stopped in the last sub on some log steps and mud and he incurred a four mark loss in the fifth.
Over 50 years of age class winner Nigel Andrew and David Fry were separated by a single mark. Andrew lost a mark in both the third and tenth sections whilst Fry lost all three of his in the tenth.
Mike Fear and Colin Dommett, who had also contested the two-day event, took the top two places in the British Bike class in which Fear was the more consistent, as Dommett lost ten marks when he stopped in both the ninth and last sections.
Dommett's son Scott was winner of the Exmoor two-day event which was decided at different locations at Cove near Bampton on Saturday and Barbrook near Lynton in North Devon on Sunday.
An entry of 130-plus competitors experienced varying weather conditions as the dozen sections at Marwoods Farm on the first day were relatively easy in the sunny and dry conditions.
But the going at Shallowford Farm on Sunday in fog, low cloud and rain was increasingly more difficult.
Dommett and Kevin Nolan were in good form on the first day, losing two marks each. Others in contention at this stage were Ian Baker and James Williams both on four and Allen Baker on 10.
Nick Smith, with a single mark lost, was best in the pastmasters' class from Malcolm Cocking, who had lost 7, Rob Hill and Colin Dommett who were both on 11 and former road racer Mick Grant was on 20.
However, no less than 38 were in the single figure bracket including Steve Eastick, Bristol's Adrian Dark and Mark Shellard, whilst eventual twin shock winner Stuart Keedwell was on two.
Nine of the dozen sections at Shallowford were set in a meandering stream, one was a hill climb and the last two were out on the moors.
Dommett dropped his only mark in the tenth sub and Keedwell lost his last mark in the last few feet of the last section of the event.
His close rival on completion of the first day, Kevin Nolan suffered a lapse of concentration in the tenth, stopping twice and he lost two places in the twin shock class.
Exmoor MCC trial at Bridgetown, West Somerset – Best expert: N Baker (Sherco) 20 marks lost. Runner-up: P Rew (Beta) 60. Youth expert awards: T Hooper (Sherco) 13, G Marshman (Gas Gas) 68. Clubman expert awards: T Manley (Beta) 29, A Muller (Beta) 44. Clubman awards: I Baker (Honda) 9, D Price (Beta) 15. Youth B class: T Rendall (Gas Gas) 30, C Smith (Beta) 50. Novice awards: M Blatchford (Beta) 12, M Dascombe (Gas Gas) 22. Over 5o years awards: N Andrew (Beta) 2, D Fry (Gas Gas) 3. British Bike awards: M Fear (Triumph) 15, C Dommett (BSA) 18. Twin Shock award: R Rogers (Fantic) 16. Youth C class: L Nicholls (Beta) 34.
South West Classic Trials Association Two Day Exmoor Trial at Cove and Lynton, Devon – Best Pre 1965: S Dommett (Dot) 3 marks lost. Pre Unit and Twin: P Edwards (Ariel) 48. Unit Construction: N Jones (Triumph) 8 two stroke, S Goodman (BSA) 13. First class awards: P Wickett (Triumph) 25, S Hay (BSA) 30, J Picker (BSA) 35, R Carson (BSA) 35. Twin Shock awards: I Baker (Fantic) 7, M Thompson (Majesty) 11, K Nolan (SWM) 13. Gentlemen's Route Awards: P Carson (BSA) 6. Pre Unit: R Trott (AJS) 14. Unit Construction: A Borton (BSA) 11. Two Stroke: R Thompson (BSA) 14. Rigid Frame: K Wells (DMW) 25, S Armisted (F Barnett) 15, K Gardner (Triumph) 15, D Jones (BSA) 17, N Osmond (Royal Enfield) 20. Twin Shock awards: S Keedwell (Fantic) 3, S Eastick (Fantic), M Hitchcott (Aprilia) 8, R Sully (Majesty) 9, M Shellard (Fantic) 10.Pastmasters awards: M Cocking (Armstrong) 15, G Atkins (Fantic) 21.