unfortunately, with the new epa guidelines in place, Harley had to really lean the new 96ci motors down. There is a difference between torque and horsepower. Displacement is 81.8 cubic inches (1,340 cc), and the engine produces 70 horsepower. Recently the oil is covering the right side of my bike, after long rides!! Type air-cooled, Twin Cam 88B Displacement 1540 cm3 Bore X Stroke 3.7x4.0 in OR 94 mm Compression Ratio 8.9:1 Horsepower / KW(hp)/RPM Torque 85/3000 lb-ft/RPM OR 115/3000 Nm/RPM Fuel System The 500cc Harley engine stock dyno tests out at 38HP and 32ft lbs of torque. Contrary to what many performance shops try to tell you, we were able to break the 90 horsepower mark without larger valves, porting and polishing the Evolution heads. The best I can tell it is coming from the air filter area.. We achieved 95.4 horsepower at the rear wheels using un-ported Harley-Davidson 1340 heads and increasing the compression with domed pistons. I dyno'd my new '07 Ultra with the 96ci motor. 2007 FLSTF 117, GMR Stage IV Welded Heads S&S 4.125 Cyl, CP Pistons, 10:84 HQ-575, HPI 51mm(4.89 Inj) TTS Tuner, Rinehart Exhaust Renegade Wheels To Much Chrome to … Compare with any other bike. Deciding which kind of power you want is the first step in increasing Harley performance. I have put about 4,000 miles since I got her, and for the first 3500 miles no problems. However, 2004-2006 heads can be fitted to 1991-2003 bikes without much trouble. We chose upgrading the chassis, suspension, and braking first over just simply adding gobs of horsepower. Harley won't even tell you the hp rating. The 883cc Harley engine stock dyno tests out at 49HP and 58ft lbs of torque. This makes the valves start out closer to each other and closer to the pistons. Horsepower is the spinning power that keeps you moving down the road. In it's stock configuration, it produced 68 horsepower ( less than my TC88CI ). I have a 1998 FLHTC with a 1340 Evo Engine... My problem is oil blowing back out of the breather, best I can tell. For those who have a stock or mildly modified engine the answer is to move up to the next “stage”… or a Stage 1 upgrade kit to be more exact. If you’re looking for an engine with more horsepower, try the V-rod, 1200cc engine. Although the Evolution 1340cc is no longer in production, the Sportster® model line of motorcycles receives Evolution engines with 883 cc and 1200 cc displacements (manufactured 1986 to … The 750cc Harley engine stock dyno tests out at 45HP and 37ft lbs of torque. 883 heads have shallower chambers than their 1200 counterparts, and longer valves to match. Torque is the twisting power that gets you going. This robbed them of horsepower and torque. ... and under much scrutiny of our editors we have listed a countdown to performance nirvana and in what order in which to do so. Before dragging out the catalogs and bolting on every gizmo claiming to make your ride go faster let’s start with the basics of a … SAC Raging Bull is the country’s leading aftermarket vehicle tuners, but as you may or may not know, we have been actively involved in successfully and reliably extracting extra horsepower from Harley-Davidson motorcycles for the past few years.. Steve Fischer, our company’s founder and the man who started his engineering career on motorcycles more than three decades ago, … Top 10 Quick Harley-Davidson Performance Upgrades. Harley-Davidson FXSTC 1340 Softail Custom: Year: 1988: Category: Custom / cruiser: Rating: 3.5 See the detailed rating of design and look, maintenance cost, engine performance, etc. You can read more about the various details of XL cylinder heads in this tech article. Rides! to match much trouble the right side of my bike, after rides. 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