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.
And to your insurance company it is still an 883 for setting the rates. Sweet..
Nice.
What great bolt on performance? The figures are not with only the cylinder kit, how much is the whole package for the near 100hp curve?
Nice! Nobody does it better than S&S
Rock Solid !
How long will a late model XL crankshaft handle this kind of power increase and high revs? Not long,I say.
Can we get a six pack of these?
Yes, looks fab.. and yes you need to do the heads as well and the cam while you are at it
I was saving up for the Hammer Performance package – which have the big fin cylinders – they don’t seem to have a problem with 100hp power…
Do these cylinders have the big fins? can’t seem to find on the S&S website…