Customised Royal Enfield 650 Interceptor sets speed record
Who said Royal Enfields weren’t fast? Not Mid-Life Cycles, the dealer behind this special Interceptor 650 which recently posted a record 132mph at the Australian equivalent of Bonneville Speed Week.
Related articles on MCN
- MCN's long-term test Royal Enfield Interceptor 650
- British team eye 400mph motorbike land speed record
- The best base bikes for custom projects as chosen by MCN
Called the Sabre, the machine is based on a 2019 Interceptor 650 but puts out around 70bhp (up from 47bhp) and has been built to show the bike’s potential and as a test bed for parts and accessories to be offered to the public.
Created to conform to the ‘M-F 650’ class, an unfaired, production-based formula, the intention was to compete at 2020’s Speed Week at Lake Gairdner in South Australia, a salt lake similar to Bonneville in Utah, USA.
The pandemic scuppered those plans – until now, as rider Charlie Hallam posted a class record of 121.78mph first time out before gradually setting a new standard of 132.05mph. Not bad for an air-cooled, OHC parallel twin displacing just 648cc.
The engine has, of course, been heavily reworked, by specialists HRA Geelong. Although capacity is unchanged, as per the rules, the crank has been balanced, rods shot-peened and new pistons added to help raise compression to a heady 11:1 requiring 98 RON fuel.
Head and ports have been modified to flow as much fuel as possible and there are special custom valves while the single camshaft is now HRA’s ‘Competition Profile 1286 Racing Camshaft’. Open race pipes exit each side, the transmission’s gears were recut to reduce friction and special sprockets were made.
Although the frame is stock, the swingarm has been lengthened to the maximum permissible, suspension replaced by Öhlins front and rear, wheels are lighter, wider alloys, and ultra low clip-on bars and a more aerodynamically efficient front mudguard were fitted. Now the plan is for Mid-Life to offer performance and big-bore kits for the road.
"The 650 really lends itself to performance mods," said Mid-Life Cycles CEO Michael Catchpole. "So we set out to build a Salt Racer using the standard Interceptor frame, as dictated by M-F-650 rules, but with a modified engine.
"We’ve kept the 648cc capacity but used various turning parts including a special cam developed by Hallam Racing. We’re also developing performance kits for the Interceptor and GT 650 road bikes based on using this cam, in Stage One, Stage Two, and Stage Three versions."