50+ year old electronics.. and why not to trust them

[m in sc]

off the ls2. perfect storage and low, low miles. still, time takes its toll.

original vs new ngk

[1976RD400C]

I just had to replace a coil on my YL1. The thing checked ok with a meter, same readings as the other one, but would not spark. Checked everything, cap, wire, voltage to it, points, it just wouldn't spark. Swapped it with the other side to prove something was wrong with it before spending $50. You need little hands to change them out being they are inside the frame.   

[grcamna3]

Mark, the top one is original,but the bottom one(NOS)is correct at 5 ohm ?

[m in sc]

bottom one is a new ngk one and yes, 5 ohm is correct. 1st one is one i pulled off bike.

[scully]

I just picked up the 69 H1 with CDI ouch them plug wires bite hard adjusting the car carb Idle ! With it running.. orig mileage is 7200 ... electrics are 👍 going to buy an all in one ign box though... peace of mind commuting 👍

[automan]

5k not 5ohms

[m in sc]

we know. just easier to say

[Striker1423]

I have a new set of coils for the GT. The big problem I have is the layout of the new set is backwards to the old and when mounted in the bracket the far left coil hits the frame.

I had to resort to cutting the old wires out and epoxying new ones into my
old coils for now.

[axldk6]

I did the SV coil conversion with new plug ends. trying to get a better spark. when I save up enough $ I am doing the electronic conversion. The other rd I bought has the points conversion ( did not know till I got it home and inspected)and has a real good spark. In the meantime I think I will replace the brushes and clean the surface and see if that helps?

[m in sc]

good(battery/points) spark is def reliant on good supply voltage to coils,ie: charging system.

[grcamna3]

I did the SV coil conversion with new plug ends. trying to get a better spark. when I save up enough $ I am doing the electronic conversion. The other rd I bought has the points conversion ( did not know till I got it home and inspected)and has a real good spark. In the meantime I think I will replace the brushes and clean the surface and see if that helps?

"the points conversion" on your other rd? What is that conversion ?

[axldk6]

sorry I did not reply earlier, open heart surgery is a bitch, I ment to say my other rd had a Dyna ( vintage smoke?) system already installed.hope that clears that up.

[SoCal250]

sorry I did not reply earlier, open heart surgery is a bitch, I ment to say my other rd had a Dyna ( vintage smoke?) system already installed.hope that clears that up.

Yikes, hope everything is good now and you're back to being you

[teazer]

I have a new set of coils for the GT. The big problem I have is the layout of the new set is backwards to the old and when mounted in the bracket the far left coil hits the frame.

I had to resort to cutting the old wires out and epoxying new ones into my
old coils for now.

Replacing the HT leads is often all that's required for the old GTs. What coils did you get as replacements?  I have used a few different coils over the years with differing fitment issues, but most are an easy fit.

[Striker1423]

I have a new set of coils for the GT. The big problem I have is the layout of the new set is backwards to the old and when mounted in the bracket the far left coil hits the frame.

I had to resort to cutting the old wires out and epoxying new ones into my
old coils for now.

Replacing the HT leads is often all that's required for the old GTs. What coils did you get as replacements?  I have used a few different coils over the years with differing fitment issues, but most are an easy fit.

I got a set of Nippon Denso replacement coils from Japan that came with a numbered harness (1,2,3) and NGK caps off eBay. In their instructions, they basically have you razer knife off a small portion of the coil plastic near the center wire to clear the frame. I'll check that out when I work on the swap.