The Harley Sportster being so popular again, you could imagine that S&S Cycle would not take long would to release a conversion kit to add the adjective “smoking” to the Sporty name.
1250 cc is more than double the horsepower of a factory 883 Sportster! The kit is the largest big bore kit S&S offers for 1986-’14 Harley-Davidson® Sportster® models that can be bolted directly into stock crankcases. It includes 3-9/16” bore pistons, cylinders, and gaskets.
Needless to say the new S&S 1250cc conversion kit will appeal to the rider who wants to get the most from his or her bike, so S&S also recommends the S&S 600 cams and S&S CNC ported heads to complete the package. Make the most of that displacement!
The Dynojet® 250i chassis dynamometer shows what a potent package the S&S® 1250cc kit for Harley-Davidson® Sportster® models can be. This chart compares a stock 2009 883cc engine before and after the 1250cc kit was installed. Over twice the horsepower! In addition to the 1250cc kit with 5.5cc pop-up dome forged pistons, the test bike was equipped S&S slip-on mufflers, stock EFI throttle body with an S&S tuned induction system, S&S 600 cams, and stock cylinder heads CNC ported by S&S. (Note: Not recommended for engines with stock 883 heads, but works great with stock 1200 heads and 883 or 1200 heads CNC ported by S&S)
Choose from silver or wrinkle black powder coat finish that matches the stock finish on late model engines. Also, these kits are available with flat topped or 5.5cc pop-up forged pistons for a choice of compression ratios. Flat topped pistons yield 10.3:1 with stock 1200cc heads or S&S CNC ported heads. The pop-up pistons deliver 11.2:1.
If you’re looking for the largest bolt-on kit available, this is it! The S&S 1250cc kit delivers great performance at an affordable price. $989.95.