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  #1 (permalink)  
Old 08-25-2017, 02:23 AM
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evo front cylinder not firing

hi everyone,

recently noticed something was wrong when I tried to hook up a tachometer to reset my idle rpm. I couldn't get a precise reading. I left it a that thinking that the measuring meter had a problem.

my engine was dropping the front cylinder every now and then. but now it's not firing at all. the rear cylinder is all right.

i have a dyna s single fire ignition installed on a 1999 evo engine. did a search of the forum but didn't really come up with my problem but did become a little smarter concerning the dyna s ignition.




i followed the dyna s ignition system testing procedure.

to start i removed the round magnetic rotor

1. i checked the both the 5Ω coils and they are ok. primary around 5Ω and secondary around 14Ω.

2. with the ignition turned on, 12.40v is coming to the plus (+) side of both coils

3. measured the voltage between the coil (-) terminal and ground. the rear coil
(cylinder) read 1v and the front 12.40v! so there is a problem here.

3a. then reinstalled the magnetic rotor with the magnet pointing to the bottom sensor.
reading now 12.40v battery voltage. so probably this module is switching

3b. now with the magnet pointing to the top sensor no change in voltage. probably the module is not switching

4. ignition module mounting plate is grounded.

5. did the ohm test between the mounting plate and the coils (-) wires.
continuity on the black wire to front coil/cylinder and on white wire to rear/cylinder.




is the module sensor for the front cylinder broken?

any ideas as to what might be the problem before i invest in a new module?

thanks in advance


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Last edited by wolfchopper; 08-25-2017 at 10:48 AM..
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  #2 (permalink)  
Old 08-25-2017, 06:46 AM
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Have you not got a bro with twin coils to swap over and see if is is a coil breakdown first ... alaps I have had plug leads fail , and a plug on my pan went down when it got hot was fine when it was cold and fired up ok .... just thinkin out loud man :-)
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Old 08-25-2017, 12:00 PM
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Since your front cylinder is dead just swap the wires from the module to the coils and recheck for spark, if the dead cylinder follows the wire you either have a bad module or a broken wire, if the front cylinder remains dead you have a bad coil.
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Old 08-25-2017, 07:42 PM
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All these readings make troubleshooting complicated...sometime ohms tests on a coil are inconclusive ..a coil can break down under load and often do.. maybe cracked,wet etc.... Try this simple test...Unplug your coil from the module and scratch the coil wires one at a time to ground....key on..you should get a nice hot spark..unless maybe you have an igniter in the circuit..don't overlook that. as a culprit.... if the coils spark then go on to the module.

When the module switches on, it simply grounds your coil..same as scratching the coil to ground.
place your ohms meter on the module wire and other lead to ground..spin the motor and watch for continuity....again if you have an igniter you will read nothing and will have to go before the igniter ...I really dont' see how a magnetic sensor can pick up a pulse unless the rotor is spinning, that's a new one on me..but maybe so..
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Last edited by Shovel52; 08-25-2017 at 08:14 PM..
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  #5 (permalink)  
Old 08-26-2017, 09:22 AM
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hi again,
and thanks for the info.

today i re-checked the coils.

with the coils wired up as per dyna s installation
1. the white wire (-) from the module goes to the rear coil/cylinder.
2. the black wire (-) from the module goes to the front coil/cylinder.
just as a reminder, with this black wire (-) i have 12v with the ignition on. according to the dyna s system test, it should be about 1v. when the magnetic rotor passes the module sensor, the voltage jumps momentarily to 12v and gernerates a spark at the specific coil.
3. two red wires (+) to plus side of the coil
4. jumper to plus side of each coil
5. ignition switched wire to plus side of front coil

while turning over the engine, i got the following results for each coil/cylinder with the above wiring .
rear coil/cylinder spark (white wire)
front coil/cylinder no spark (black wire)

then i inversed the wires coming from the module. i put the white wire on the front coil/cylinder and the black wire on the rear coil/cylinder.
now
rear coil no spark (black wire)
front coil spark (white wire)

so i suppose the coils are all right and function correctly as they give a spark.

as the black wire comes from the module i can suppose that there is a problem with the module.

does this make any sense?


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Old 08-26-2017, 02:35 PM
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I looked on ebay for Harley igniter, and found nothing , so yes, sounds right, unless it is a bad wire, sounds like your module is bad...
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Last edited by Shovel52; 08-26-2017 at 02:47 PM..
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  #7 (permalink)  
Old 08-26-2017, 02:58 PM
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thanks

what's an igniter?

my wiring on the bike is very simple.
the wiring from the dyna s module goes straight to the coils.
ignition switched 12v goes to the front coil.

are these dyna s modules repairable?

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Old 08-26-2017, 03:03 PM
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Mine did the same ,ignition module took a crap, would lose a cyl under load .
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Old 08-26-2017, 07:04 PM
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Igniter is a voltage booster to the coil..some coils have to have one to fire correctly...just something to make it more complicated..most automobiles have them now..and some bikes...don't think you can repair..isn't that nice?
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Old 08-27-2017, 01:28 PM
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well just bought a new module + magnetic pick up which should arrive in a few days. i'll give an update after i installed the new module and had a run.

in the meantime i suppose i could wire up a dual fire 5Ω coil and run the engine as one of the two modules functions?

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Old 08-27-2017, 06:02 PM
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A lot of people have a problem with heat burning up the module...If it ever happens to me I would consider going back to points, as long as I have the high voltage coils...that's what makes the big difference...tired of messing with all this electronic junk.....of course you are back to duel fire, I think it is just more vibration..
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Last edited by Shovel52; 08-27-2017 at 06:05 PM..
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  #12 (permalink)  
Old 08-28-2017, 09:47 AM
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i had points on the evo till about 1500miles (2500km) ago. i was tired of trying to set up the gap.

I've fitted contactless ignitions on all of my classic cars and they been running without any problems for over 15 years!

just hoping it's the module that packed up.

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Old 09-12-2017, 08:54 AM
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hi again
here's a quick update.

i recieved my new module/ground plate.
just had a small hassle in taking out the old dyna ignition, in having to empty and remove my fuel tank.

in the meantime, i contacted dynatek support and they repair the modules for a price -- us$91 plus shipping.

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Old 09-12-2017, 06:44 PM
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That's pretty good isn't it? new modules are about $300 or so. I guess they just solder in a new chip...
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Old 09-13-2017, 10:23 AM
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today i completed the installation of the new dyna s ignition. everything is correctly wired up as per the dyna s ignition system testing.
the problem was indeed the non functioning of one of the modules.
now i just have to put back the tank and give the engine a try.

what is the normal advance on an 1999 evo engine? 35 at 2000rpm?

the new module is much smaller than the one i had on the bike
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