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post #1 of 10 (permalink) Old 12-01-2012, 09:11 PM Thread Starter
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86 fxr

need some advice please >> i installed a Daytona Twin Tec ignition .i brought front cyclinder to the TDC mark the straight line then static timed it till the red led went off. does that ignition automatically adjust for advance or should i have set it at the dot not the straight line in the inspection hole ?? bike is running good just worried about pre detonation
thanks for any advice
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post #2 of 10 (permalink) Old 12-02-2012, 06:26 AM
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The advance comes in at a predetermined RPM, that's why it gets set at static TDC. It's automagic !

Disclaimer : Don't believe anything I say unless you are absolutely sure that I know what I'm talking about .
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post #3 of 10 (permalink) Old 12-02-2012, 10:40 AM Thread Starter
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thanks Schmidtys that what i thought but didnt wanna second guess these new electronic modules .been using points for yrs on my older stuff and decided to take off the original Harley box and try a Twin Tec
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post #4 of 10 (permalink) Old 12-03-2012, 04:39 AM
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You have done it right..... Welcome to the 86 FXR club, they are simply the best harley ever made!

For the 86 model you use the dot as TDC (despite what some manuals say). If you mess up and use the vertical mark you will find that you cannot gets the led to work properly.

Have you dropped in a new cam yet?

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post #5 of 10 (permalink) Old 12-03-2012, 06:03 AM Thread Starter
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hmmmmmm well thats what i did i used the verticle mark not the dot so i guess i better redo it .funny thing is it runs great . and yeah the directions are some what misleading because it said line up the verticle line then rotate the module till the light just goes out
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post #6 of 10 (permalink) Old 12-03-2012, 06:23 AM
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If it runs fine then leave well enough alone.
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post #7 of 10 (permalink) Old 12-03-2012, 09:27 AM
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Those are nice ignitions, that allow plenty of latitude when needing to manipulate the timing needs for high-performance applications.
Scott

"....3 dueces and a 4 speed..........and a 389"..........
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post #8 of 10 (permalink) Old 12-04-2012, 06:55 AM Thread Starter
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yes it has an EV27 cam in it
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post #9 of 10 (permalink) Old 12-04-2012, 08:36 AM
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By rights, an OE ignition will take you home, even with that cam, unless you have a set of heads that'll allow power to be manufactered out past 5200 rpms, or a compression increase, building cylinder pressure, that would warrant the timing rate of full advance to be ramped in slower than by just retarding the plate.
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post #10 of 10 (permalink) Old 12-04-2012, 10:57 AM Thread Starter
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thnx hills yes the heads have been ported and polished runs good since i changed ignitions only reason i did was the oem went out and was cheaper and easier to run the daytona just their directions are alittle fuzzy says to put verticle line in inspection hole and then back off module till light goes out seems to me should be at the 35 degree dot in the inspection hole but hey i didnt made it and it runs good one touch of starter button and its running so guess i'll buy a dial back timing light and check it later
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