S&S Cycle

CAMSHAFT OVERVIEW OES: Original Equipment Specification (OES) A bolt-in replacement cam with stock cam timing is designed for riders with stock engines. Does not require tuning. Bolt-in stock. Equivalent to HD® A-Grind 510: Designed as a bolt-in cam for 88, 95, and 96 CID engines with compression ratios below 9.7:1, it is primarily intended for use with stock, un-ported heads. 3000–5500 rpm. Bolt-in. 551: Designed for engines with 96 to 106 CID and 9:1 to 9:9 compression, this is a bolt-in cam set designed for stock or mildly modified touring bikes. 551 cams are not recommended for compression ratios of 10:1 or greater. Greatly improves low- end and midrange torque, strongest from idle–4000rpm. Bolt-in torque. 557: Designed for Tri Glide® models, this bolt-in cam, with its short duration, produces lots of usable torque. The camshaft’s stock base circle permits the use of stock pushrods. However, we recommend S&S Quickee Adjustable pushrods for easy installation. Fits all 2009–2012 Harley-Davidson® Tri Glide® models. Bolt-in. MR103: Designed as bolt-in cams for 103 CID engines with stock 9.7:1 compression ratio up to 10.5:1. Works well with stock, un-ported heads, but is great for S&S CNC ported heads. More power across the rpm range best results form 2500–5500 rpm. Bolt-in. 570: Designed for 88 to 103 CID engines with compression ratios between 9:1 and 10:1, this bolt-in cam will provide a nice power increase across the entire power band. 3200–5700 rpm. Excellent bolt-in for overall power on 103". Bolt-in overall. 583: Optimized for use in the Softail®/Dyna® lines, this bolt-in cam makes horse- power and torque that you can feel all the way through the rpm range, making the most power right where you need it:1500–5000rpm. Bolt-in. 583 cams are not recommended for enginess having comression ratios greater than 10.1:1.

HP103: Designed as bolt in cams for engines with 103 and stock 9.7:1 compres- sion up to 10.5:1. Works well with stock, un-ported heads, but is great for S&S CNC ported heads. Best power in the higher rpm range, 3000–6000 rpm. Bolt-in. 585: Designed for 88 to 106 CID engines with compression ratios from 9.7:1 to 10.5:1 and 106 to 124 CID engines from 9:1 to 10:1 compression. This bolt-in cam provides massive horsepower and torque increases starting at 3000rpm and holds steady all the way to redline. 3500–6000 rpm for 88"–103" engines and 2500–5500 for larger engines. 625: Cam set designed for 95" or larger engines with compression ratios between 10.0 and 10.75:1. 3000–6000 rpm. High lift valve springs and adjustable pushrods required. 635 H.O.: High lift cam for modified engines with 106" or greater displace- ment and compression ratios between 10.0:1 and 11.0:1. Works well with stock, un-ported heads, but S&S CNC ported heads are recommended. Best power from 3000–6000 rpm. This is not a bolt-in cam set. High-lift valve springs, adjustable pushrods, and clearance checks are required. 640: Used in S&S T124 engines, this cam makes horsepower! Intended for engines of 95 CID or more w/compression ratios between 10.5:1 and 11.5:1. 3000–6000 rpm. High lift valve springs and adjustable pushrods required. 675: A high lift monster, this cam set is designed for 120" or larger engines with at least 11:1 compression ratio. 4500–6500 rpm. High lift valve springs and adjustable pushrods required. OPTIONS • Chain drive or gear drive (See the following pages for part numbers) HERE’S HOW IT WORKS Each of the two exhaust cam lobes are equipped with a spring loaded compression release lobe on the“heel”of the cam at the point where the valve would normally be fully closed. The lobe holds the exhaust valve open slightly at cranking speed. This releases some of the compression, making the engine much easier to crank. Once the engine starts, and rpm increases, the compression release lobe is centrifu- gally retracted and the engine runs normally, with full compression, and without any loss in performance. This allows a stock starter and battery to start nearly any engine.

S&S EASY START CAMS Start any engine regardless of displacement or compression ratio, with a stock starter. Easy Start Cams from S&S® Cycle make hard starting obsolete for 1999-'16 big twins. Available in economical chain drive and rock-solid gear

USPATENT7,699,035 EASY START CAMS exclusive

drive versions. Don’t get caught“dead”without them!

FEATURES AND BENEFITS • Start any engine with a stock starter • Save your starter and battery! • Reliable—tested for 100,000 accumulative starts and over 150,000 road miles without breakage or compression release failure! • Automatic—no buttons to push

The compression release lobe reduces compression until the engine starts.

Increased rpm causes the compression release lobe to be centrifugally retracted so the engine runs normally.

90 Order 608-627-1497 S&S Late Models 1999–up