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Revtech 125" 2050cc Chrome & Polished Crate Engine Motor Harley Evolution Evo

Manufacturer: Custom Chrome



PART # 680240

Polished & Chrome Finish


1984-1998 Touring, 1984-1999 Softail, 1984-2000 FXR & 84-98 Dyna models.

  Also fits Chopper/Bobber/Rigid applications using Evolution engine


2 Years / 20k Miles

Engine Specs:

9.5:1 Compression

115 HP @ 5500

135 TQ @ 3700

RevTech® 125" Engine " BIG INCH MUSCLE!
Introducing the all-new RevTech 125"! With more power, dynamite looks, and greater dependability than ever before, the RevTech 125" offers up-grades over traditional v-twins that make it truly one of the "best of the best." Starting with a clean slate, our engineers incorporated the best features and technology the market has to offer to create for you a fire-breathing RevTech 125" engine. These masterpieces are ASSEMBLED IN THE USA with parts sourced from some of the biggest and best names in the business. We're talking about brands like Manley, JE Pistons, Daytona Twin Tec, Andrews, Mikuni American Corp., Timken and many more.

RevTech is known for it's extreme attention to detail and it's evident in this engines special styling, amazing reliability and unreal "seat of the pants" torque. And we didn't stop there! We included increased fin area on the cylinders and heads and state of the art internal piston oilers, creating maximum temperature control and increased engine life. The traditional breather system with gear has a long proven track record, specially designed "D'-shaped intake and manifold ports provide exceptional controlled air flow and the 45mm Mikuni carburetor provides the 125" monster all the fuel it needs.

Earning a position in the RevTech® line of engines is no easy task. Only after rigorous testing can an engine take its place among a legacy of motors proven over two decades of service. Before putting the new 125" into production, we subjected it to durability testing by Optimum Power Technology in Bridgeville, PA., where the engine withstood a brutal non-stop 100-hour beating. During testing varying loads were placed on the engine from a 950 rpm idle up to 5,000 rpm's for various lengths of time with brief rest periods in between to cool off and go again. The average duration of each cycle was 33 minutes and this cycle was performed more then 180 times during the 100-hour test period. We go to these lengths to ensure that each and every RevTech® engine has earned its place among the finest engines available today.

These new engine assemblies will replace 1984 thru 1999 Evolution® style engines.
Assembled with Pride in the U.S.A.

•Cast from 356-T6 aluminum with wall thickness optimized for
maximum strength

•Blind case bolts for cleaner appearance
•Smooth crankcase deck to cylinder base profile for
cleaner appearance
•7/16" threaded cylinder studs proven in drag racing applications


•Flywheels forged from 4140
•Pinion and sprocket shaft are pressed in and keyed from 8620 gear material ground and hardened.
•Connecting rods forged from 4340 chromemoly steel - the strongest material available for these applications
•Larger straight 1 1/2"-diameter pressed-in crankpin using 8620 gear material

Oiling System

•Same reliable Evolution style oil system with the addition of internal piston oilers for better heat dissipation

•3:1 ratio oil pump drive gears and high volume oil pump enable
significantly increased lubrication and cooling


•4.250"-bore with 4.410"-stroke for ideal high torque/high
horsepower output

•More fin area for increased cooling

•Machined fin edges for better appearance

•Forged JE slipper-skirt pistons


•New RevTech® roller rockers

•More fin area for increased cooling

•Machined fin edges for better appearance

•New compression releases for easy starting

•New "D"-shaped intake ports and manifold


•Mikuni HSR 45 from Mikuni American Corp.

•Intake manifold matched to heads for ideal flow efficiency

•Low profile air cleaner design for high performance while providing improved rider comfort


•Self contained solid-state ignition from Daytona Twin Tec


•Andrews EV72 .560" lift cam for great performance and easy starting

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