Other Stuff > Misc / Open
1977 GL 1000K2 COILS
Moorey:
--- Quote from: K2-K6 on December 03, 2022, 02:59:51 PM ---If it helps the overview for OP, electronic equipped makes use of low ohm rating because they can control the switched on time, dwell, on a fixed time basis and irrespective of engine rpm.
Points based systems have dwell in angles of crank but with it changing/shortening as revs rise on time basis. Too low ohm rating leaves the coils on too long during low rpm if they are paired.
Low ohms rating on points may overheat coils in drawing too much from supply at low rpm. High ohms on electronic may give high rpm compromise as it remains not fully saturated when supply is terminated to fire plugs.
--- End quote ---
The bike is still on the points system.
Moorey:
--- Quote from: Bryanj on December 03, 2022, 05:22:18 PM ---Big problem with the 1000 was they had 9v ballasted coils to get better spark for starting, like 70' fords and vauxhalls
--- End quote ---
The ballast resistor is within spec Bryan. I have asked the same question on a couple of Wing forums and a Wing FB page but no responses on the
actual coil readings
Bryanj:
It is so rare for coils to fail electrcaly that i cant remember a set! the wires do get old but Ash'fix cures that.
K2-K6:
Would the information so far on here suggest that the coil will be 9v /2ohm making a running system of coil plus ballast switched by points at combined nominal 5ohm in continuous state?
Then that would produce 12v (over capacity) 2ohm "hot" coil via supply route when starting as it's usual to temporarily eliminate the ballast resistor through start switching to enhance immediate firing.
heli_madken:
--- Quote from: Bryanj on December 05, 2022, 05:03:03 PM ---It is so rare for coils to fail electrcaly that i cant remember a set! the wires do get old but Ash'fix cures that.
--- End quote ---
I was really unlucky my original K2 was just over a year old back in 1979 when both coils suddenly failed leaving me stranded, so it can happen.
On my current K2 I went to a Dyna electronic system with Dyna 3 ohm coils and bypassed the ballast resistor. Been in place for 4 years and never missed a beat.
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