[Daber]

Just had my carbs rebuilt by Bear Cycle, starts and runs great, until hot, then starts missing and backfiring. Must be ignition, right? What do I replace, the coils? It’s got the originals and points that I’ve checked and set, valves too. If I go with Dyna replacement coils from Randakk, and buy two, do I need the ballast resistor that is on the old coils?

 

[AZgl1800]

just a SWAG,
but the coils are probably cracked, and when they get hot, the cracks open up and the spark jumps to Ground.
DaveO430 uses GL1500 coils, cheap and they work.

 

[DaveO430]

DaveO430 uses GL1500 coils, cheap and they work.

Since when? The Dyna coils probably come with instructions on whether or not to use a ballast resistor.

 

[AZgl1800]

Since when? The Dyna coils probably come with instructions on whether or not to use a ballast resistor.

you wrote an article about using the 1500 coils on the 4 cyl bikes

 

[DaveO430]

you wrote an article about using the 1500 coils on the 4 cyl bikes

No I did not. I wrote the Neon coil article.

 

[Wingleader76]

Just had my carbs rebuilt by Bear Cycle, starts and runs great, until hot, then starts missing and backfiring. Must be ignition, right? What do I replace, the coils? It’s got the originals and points that I’ve checked and set, valves too. If I go with Dyna replacement coils from Randakk, and buy two, do I need the ballast resistor that is on the old coils?

Gretings,
On my 76 I run with Dyna coils, ignition paired with Accell 8 or 9 mm wires. Once dialed in she runs fantastic.

Ive used the same setup in my old 78 wing to great effect.

Ballasts are not needed with the Dyna setup.

 

[Bike...and Dennis]

Wow! You have a Cavalcade sitting in your garage. Did you buy that, or did it just sneak in one night? .

 

[gnkapteyn]

I have used a Dyna ignition and coils for over 25 years. Had one pick up coil go in 1999. I replaced it and have never had a problem since. I wonder if the condensors are breaking down under heat

 

[Wingleader76]

Wow! You have

And you have great eyes! Yes, thats my 86 suzi Cade, she wandered in about 8 years ago, which caused my wing to go into long hibernation. Which then caused a long term restoration said wing, with my son, who is now the proud owner, helping. Im still her loving mechanic though.

 

[Daber]

The happy ending to this thread is I mounted the Dynatek coils which fit the original coils bracket perfectly, and I DID use the original ballast resistor. There wasn’t room to Mount it on the bracket with the new coils so I ran the bracket bolt through just one end of the resistor frame. Seems strong enough. With great hope, I cranked the bike, no sputtering, nothing. Argh!! Then I remembered that the two coils each serve two spark plugs (1 & 3, 2 & 4), so I swapped wires, hit the button, and VAROOM, she cranked up like a bride on her wedding night! And with the new coils and plug wires, no mis firing at all, smooth acceleration, and thanks to Bear’s Cycle, it also idles like it should. Happy happy!

 

[Daber]

Here it is. Still looking for an original side cover on the right, I broke it and epoxied for now.