My 1972 504 originally had the bakerlite insulating tubes as per item 5 in the parts drawing above. When I upgraded to the series 1 505 square port head, I changed over to the insulators as per the 4 in the packet in your original photo. I believed these to be series 505 insulators. I've never seen to the bare steel rod set up before. Maybe it was a European thing.
Changing to the early 505 insulators has made a big difference to the performance. I did this over two years ago and the engine has not faulted since (touch wood!!!!)
Check out Toyota spark plug leads, same design with insulated tube to plug
Toyota Readily available in Autobarn, just get the correct length you need
Or
Just use standard plug lead, attach to plug and use hollow tube plug spanner to tighten.
Silicon plug to hold lead central and keep out rubbish.
My 1972 504 originally had the bakerlite insulating tubes as per item 5 in the parts drawing above. When I upgraded to the series 1 505 square port head, I changed over to the insulators as per the 4 in the packet in your original photo. I believed these to be series 505 insulators. I've never seen to the bare steel rod set up before. Maybe it was a European thing.
Changing to the early 505 insulators has made a big difference to the performance. I did this over two years ago and the engine has not faulted since (touch wood!!!!)
I have seen all three types here in Australia....a few times each.
Yes, the early type ones were good as the bakelite was the thickest. However, having said that, my first 504 was only 9 years old and one or two insulators had broken down and were conducting spark across to the metal tube.
They also require a couple of slots in the top of the outer metal tube, as they have lugs that fit into those slots. They need this as there is a spring inside and the whole thing would pop up otherwise.
Doush / Chadi....I would recommend that you don't use the insulators marked number 4. Although they came out later, they were really very thin.
I mean REALLY thin. Ridiculously thin !
I would recommend either getting Toyota insulators which come together with electrical leads (find ones the correct length). They look like number 7 in the above picture, but with electrical leads attached.
OR if (for some reason) you really, really want to keep what you are currently using and ONLY get insulators, go to a wrecker and get some Toyota insulators, and cut off the tops. Then use the bakelite tubes as insulators as if they were the number 4 s.
After you have experimented by doing this, you can decide whether to buy new Toyota leads. At least it will cost very little to get secondhand ones from the wrecker to experiment with.
Wots wrong with using the Chinese ones they look fine and well original to me?
Iv got some of the covers, ie part 5 in the drawing if that helps?
I am using the new stick on my XN1A. So much better to remove and plug in than the older model that came with my earlier XN1.Ditching the old setup altogether
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For the newer one (fresh plugs + wires)
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You have converted to electric fan? Any reason for the electric fan and your impression about the electric fan so far?
Lion King - Monk.