Steve ‘Brew Dude’ Garn built Time Bomb 45 Magnum as a tribute to Randy Smith, the first engine builder to mate a Bit Twin top end to a set of Flathead cases back in the ‘70s.
While that feat in itself is difficult enough Steve decided to take his build even further and split the Ironhead’s rocker boxes, added dual plugs on each cylinder and reworked the heads to allow him to fit dual Amal Monobloc carbs.
More Details
Welded and machined HD 45 cu. in. flathead cases with HD 54 cu. in. Ironhead Sportster top end. Top end now uses case studs. The flywheels are heavily modified Sportster (Big Twin motor sprocket shaft) with a mix of Big Twin and modified bearings. Heads are Ironhead- intake section removed and reworked for dual left/right Amals. Also the heads were machined for dual plugs.
Early HD P cams modifed for drive of the 45 oil pump. Split rockers for access to dual spark plug location. Stepped SS equal length exhaust. Total research. welding, machining and assembly of engine took 320 hours.
BREW elastomer seat suspension. Seat pan-BREW. Seat -Duane Ballard, BREW Titanium bars. Total Bike Wt. 311 lb!
Steve reckons that in total, including research and machining time, that he put in over 320 hours of work into the motor.
2009 World Championship – Freestyle
| Builder | Steve “BREWdude” Garn |
| Owner | Steve “BREWdude” Garn |
| Location | Creston, NC |
| Country | USA |
| Website | www.brewracingframes.com |
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| Bike Name | Time Bomb 45 Magnum |
| Year / Model | 1958 Harley Davidson 45 cases/Ironhead Top End |
| Engine Make / Size | Harley Davidson / 900cc/ 54 Cu. In. |
| Transmission Type | BSA A10 |
| Frame Make / Type | BREW 4130 |
| Front End | Machined Betor Forks, Ceriani Triple Trees |
| Rake | 33 |
| Stretch | 2 |
| Swingarm | Hardtail |
| Wheels – Front | 70′s Akront/Spool Hub w/SS Spokes |
| Wheels – Rear | 81 CR250 Hub/Excell Rim w/SS Spokes |
| Tires – Front | Metzeler Tourance 110/80R-19 |
| Tires – Rear | Metzeler Tourance 140/80R-17 |
| Brakes – Front | none |
| Brakes – Rear | Honda CR250 |
| Painter | BREW |
| Chroming / Plating | Powder- BREW |
| Additional Info | |
