Topic: dyna coils

[Steve F]

I've been using the DYNA-S and DYNA 3-ohm coils this season so far with no problems.  In fact it was a huge improvement over the stock 5-ohm coils and points system.  I'm totally happy with it since I get the fattest spark this bike has ever seen, and the timing is "perfect every stroke" which means there's no more wandering of the timing mark when I check it with the timing light. Rock solid....period!  I might also add that I have replaced all of the bulbs, except for the headlight, with LED's.  This leaves more power for the "hungry" items like the ignition system and headlight which BTW, I'm also using a SilverStar 60/55W headlight and love it.  I don't have any voltage numbers to give you, but I haven't had any problems that would make me want to get out the voltage meter and check things.  Also, keep an eye on the electrolyte level in the battery so you don't cook it.  Get yourself an electrolyte tester, (they're very cheap) to keep the specific gravity where it belongs.
Regards,

[KB02]

Okay, so let me see if I can wrap my kindergarden education in electronics around this and see if I've got this straight:

Lower Ohms (resistance) means more power is allowed through the coils thus providing a stonger spark at the plug causing better combution in the chamber.
            This is a good thing. - so lower is better.
The more power through the coil, however, robs that power from the rest of the system, thus reducing available power for charging, lights, accesories... etc...
            This is a bad thing. - so don't go too low.

Dyna recommends the 2.2 ohm coils, but most here seem to recommend the 3 ohms coils. I can use the stock 5 ohms if I wanted to (not that I can since I have one thats shot), but I won't see much (if any) of a performance gain since I am not improving my spark at all, simply the timing reliability.

Have I got it right? Am I close?

[Steve F]

Yep, you got it!

[dusterdude]

if we are talking about accelerated wear on the points,what is the life span of a normal set of points on these bikes.

[ofreen]

.........but most here seem to recommend the 3 ohms coils. I can use the stock 5 ohms if I wanted to (not that I can since I have one thats shot), but I won't see much (if any) of a performance gain since I am not improving my spark at all, simply the timing reliability.
Have I got it right? Am I close?

I've had the Dyna S on my 750F for almost 80,000 miles.  Two benefits you didn't mention is that the Dyna is set and forget.  I haven't had to touch anything since I installed it.  Also, spark plugs last a long time.  I changed the last set at 20,000 miles. Probably didn't have to.

I ran the Dyna S a year before I installed the Dyna 3 ohm coils.  The Dyna S definitely showed an improvement over the points, but I can't say I noticed much, if any, difference when I installed the coils.  They are a pretty green, however.

[Jeff.Saunders]

Okay, so let me see if I can wrap my kindergarden education in electronics around this and see if I've got this straight:

Lower Ohms (resistance) means more power is allowed through the coils thus providing a stonger spark at the plug causing better combution in the chamber.
            This is a good thing. - so lower is better.
The more power through the coil, however, robs that power from the rest of the system, thus reducing available power for charging, lights, accesories... etc...
            This is a bad thing. - so don't go too low.

Dyna recommends the 2.2 ohm coils, but most here seem to recommend the 3 ohms coils. I can use the stock 5 ohms if I wanted to (not that I can since I have one thats shot), but I won't see much (if any) of a performance gain since I am not improving my spark at all, simply the timing reliability.

Have I got it right? Am I close?

Dyna recommends 2.2 ohm coils with the Dyna 2000 ignitions, and 3.0 ohm coils with the Dyna S ignitions.

lower resistance does create a stronger spark, but you have to understand the ramifications of going too low.  It's best to stay with the manufacturers recommendation as that is what they will warranty...  if you choose to run a lower resistance coil like 2.2 ohm with a Dyna S ignition, there is a good chance the ignition will fail prematurely (or so Dyna tells me...).

[jaknight]

        HEY SteveD and Rxman,

     I did take a sip from your collective cup of knowledge and it sure did clear my head (at least about this).  You both made very good points!

     Now, let's see.......... I have some money that should be coming in that my wife doesn't know about......... I think........hmmmmmm......... 3 ohm coils........

     ~ ~ ~ jaknight ~ ~ ~

[nuke]

Wow I've read this thread 4 times now and it all makes sense