Hello my name is Glenn from the UK.
I am tearing my hair out with my sons 1978 gs550e running problem which is as follows,
no1 cylinder keeps dying (no spark from plug) if I put a new plug in it runs fine for about 10 miles then kills the plug again, since having this problem both coils and plug caps have been replaced but the problem still persists on the same cylinder, the carbs are fine/clean and all float heights set to the correct heights and all bowls getting fuel through.
I cannot understand what would cause a plug to stop sparking after such a short time, not every new plug I put in can be defective so there must be a problem elsewhere, it's as if there is a surge in voltage or something to cylinder no1 which is taking out the spark.
Any ideas gratefully accepted