Page 197 of High Performance Parts for American V-Twins 2008 by S&S Cycle

1958-2008 50th ann iversary continued ­ s&s® ist ignition system with guardian diagnostic system installation the new s&s intelligent spark technology ignition system can be installed quickly and easily without permanent modifications to the stock wiring harness on 1994 06 motorcycles s&s wiring harness adapters plug directly into the stock wiring harness of late model carbureted motorcycles 1986 93 sportster® models along with 1984 93 and some 1994 big twin models require minor wiring harness modifications once the system is installed it requires no adjustment ignition timing is automatic you don t need a timing light pictured exclusive s&s knock sensor installed on cylinder head top motor mount no other ignition system for v-twin motorcycles uses knock sensing to control ignition timing additional features simple installation ­ installation kits plug into stock wiring harnesses no timing adjustments ­ the system adjusts timing automatically 6250 rpm rev limiter adjustable to 7200 maximum with guardian diagnostic system single fire operation ­ requires two coils or dual coil package high output ­ automatically maximizes coil output automatic dwell adjust ­ will optimize current for any coil 0.5 to 3 short circuit and reverse polarity protected diagnostics ­ scan tool harness jumper or guardiantm diagnostic system optional guardian diagnostic system allows engine builder increased flexibility and control speedometer calibration in 2004 06 models requires guardian diagnostic system rev limiter the s&s ist ignition system has a variable rev limit which is preset at 6250 rpm but can be reduced or raised to a maximum of 7200 rpm using the optional s&s guardiantm diagnostic system software the ability to reduce the rev limit is very attractive to owners of balanced harleydavidson® twin cam 88btm engines who are concerned about damaging the balancers by over revving here s how the rev limiter works when the engine speed reaches the rev limit the module goes into a stutter-fire mode a noticeable but not severe combination of fires misfires should the engine speed continue to increase to 256 rpm above the rev limit the ignition stops sparking the engine until the engine rpm falls below the rev limit a break-in rev limit program is also available to protect new and rebuilt engines from damage when this feature is enabled using the guardian diagnostic system software the initial rev limit is set at 4250 rpm and increases in three steps reaching the maximum of 6250 rpm when the engine has accumulated 24 hours of operation once enabled the break-in rev limit program can not be canceled it should be noted that ist ignition modules sold with complete s&s engines are slightly different in that they have a maximum rev limit of 6250 rpm and the break-in rev limiter is enabled the maximum rev limit in those modules can not be increased note the s&s ist ignition system is not recommended for kick start applications unless a cam position sensor is used engines using crankshaft position sensors will be difficult to kick start the same ist module is used for all engines installation kits are available that allow connection to the stock wiring harness for specific applications s&s intelligent spark technology ist ignition system s&s intelligent spark technology ignition module msrp $384.95 55-1221 s&s high output single fire coil msrp $129.95 55-1571 order toll free 866-244-2673 6-2

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