GSF 600 won't idle and has poor throttle response.
If it was running fine when you got the bike it makes me wonder how you discovered the spark plugs were rotten? Clearly they weren't very rotten...
Spark plug gaps rarely need adjusting these days prior to fitting, mostly just checking to ensure a gap hasn't been closed due to being dropped is all that is needed. I am wondering if you made the elementary mistake of confusing metric and imperial measurements; I apologise if you find the suggestion insulting.
If it wasn't an elementary mistake, I think you should begin a systematic fault diagnosis by checking the spark power and quality.
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