Ignition Upgrade Questions

[Magnum-HD]

I have a 99 Fatboy with Baisley ported heads, W8 cam, sreamin-eagle 2-1 exhaust and a Screamin-Eagle 32421-94 single fire ignition.

I have a few problems with the bike as it stands.

First it kicks back on the starter often when cranking it over.

Second when attempting to start it huge loud muffler explosions occur, which scares anyone within a city block and is quite an embarrassment.

Third, when rolling on the throttle at low to moderate rpm the ignition retards far too much when the vacuum switch signals the intake vacuum is low.

I am thinking a dual fire ignition might solve the muffler explosion issue and a different ignition might help the engine kicking back on the starter when cranking it. It does not do this all the time so I am thinking the ignition gets confused, over which cylinder is which.

As far as the vacuum retard goes is there an ignition that replaces the switch with a vacuum sensor so the ignition would be retarded gradually instead of all at once? Or is this issues solved by a programmable / tunable ignition module? What is the best ignition to purchase?

Thanks,
Charles

[Mike]

The 32421-94 ignition is actually dual fire. The Crane HI-4 would be my choice since it is adjustable and has intitial timing offests to help with hard starting. It also has a two revolution "run on" to help starting and can be configured for single fire with a coil purchase. The VOES switches between two curves, each of which advances the timing differently. The HI 4 can be configured with or without the VOES active and has prgramable curves.

[Magnum-HD]

Thanks Mike!

I had my dual and single fire terminology reversed but you figured that out. anyway will the single fire system solve the muffler explosion issue? I figure the issue is caused by the spark firing on the exhaust stroke with unburnt fuel in the cylinder or exhaust pipe.

Charles

[Mike]

Cannot give a garuantee, but should. Single benifits are typically, easier start-up, slightly less vibration and slightly better fuel milage. No performance advantages (I.E., horsepower gains vs dual fire).