Streetbobjim, Depending on what year Sporster you have and cylinder head modifications you do should render your ignition choice. If the standard stage 1 upgrade is being installed even with the SE bolt in camshafts the stock ignition will work just fine. If minimal cylinder head modifications are made with stock valve springs you will have no gains in raising rev limit or altering spark advance. If however you install enlarged intake valves, complete intake port work and increased valve spring pressure you can have some advantages to change your ignition. Keep in mind, a performance ignitons will only gain small power increases in this case, however are adjustable to prevent pre ignition. This is a must because if using the stock 883 cylinder head casting compression will be increased, to what amount depends on who does the work. Pre-ignition in any amount is no good. If you have a 1990-1999 the Screamin Eagle selectable curve ignition (Dyna 2000 with a Screamin Eagle decal on it) works great and is upgradeable to single fire and built in tach adapter. If replacing 2000-2006 install the 1200 module. The 883 module has a different spark advanced because of the different trans pulley 27 on the 883, 29 on the 1200 for 1991-2003, and 28 for 2004-up 883. The 1200 module will be more tuner friendly. Remember the 02-06 SE modules allow 7000 rpm so you must have valve springs etc to support. If you want the best possible performance the Daytona Twin Tec cannot be beat.

 

The new guy with 3 posts. All helpful and informative. Welcome GUTMAN!

 

For the 1200 Flat top SE Cylinder & Piston they actually install a special head gasket if you use the original 883 heads/valves/cams in order to limit compression to the original 883 range.

For example, I am really only after the increased volume to increase torque at the low end. I am NOT interested in increasing the top speed of my Sportster. Since I am already getting some low end pre-ignition at times when the engine oil gets near 200 degrees, I am NOT looking for increased compression. The bike has already been tuned and the advance is at spec. The gas is 93 octane.

 

Thank's XL OCD. Broken Leg, Go with a Wiseco reverse domed pisiton. No cylinder head mod are needed for this conversion. Power should equal mid 60's, up from 40.

 

Thanks for the advice, Gutman. It's Harley that's pushing the SE pistons, but I really am suspicious of that "special" compression limiting gasket. The reverse domes sound like a better solution and the "Professor" (Harley exclusive third party shop) said pretty much the same.

 

I have a 2006 1200 XLR with stage 1. I chose the SE racing ignition after researching ignitions on line. The one on my bike just became available in mid November 2006. It was surprising what a difference the performance ignition makes. The SE ignition sparks once per plug with a stronger/longer charge than the stock ignitionand it gives you more usable rpms by raising the rev limits. The engine has better starts and when it is warmed up it has a good idle "potato" sound. The module retards timing by five degrees at wide open throttle and raises rev limit to 7000 rpm. The part number for mine is 32471-06.For the money (119.00) I recommend the SE ignition.

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Went with the Wesco reverse dome pistons as Gutman suggested, new SE cylinders, SE 1 air and jets, SE Slip On's, larger tank and riser bars. Initially Harley warped one of the heads during installation and the resulting oil leak nearly did me in, but now that they have re-done itthe bike is performing very well with the Euro 883 gearing (same as US 1200). She is just what I need for both aroundthe cityand on the open road.

 

I am in search of the ignition module used in the 750XR flat tracker. I used to have the part number but it has been "misplaced" long ago when I closed up my shop. Does anyone have the part number, or better yet have a good one they will part with?

 

Ditto.....what he sadi is correct....and I would replace it with a 1200 compatable module, you will notice the difference in the power band...but I would drive it as it is (with the kit first) just so if youhave issues you will know it was not caused by the new ignition