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You should be running either Champion N-3's or NGK B-7's in a '77 T140V. An N-5 is too hot of a plug. If you are fouling N-3's, the bike is running too rich. After checking valves and timing and checking for weak spark, make sure idle circuit is not plugged. Do a search on how to clean this. Adjust idle mixture screws 1 1/2 turns out to start. If still fouling, carb jetting needs to be looked at by doing plug chops. Open pipes should not require a hotter plug. Usually they tend to make the bike run leaner. So if yours is running rich with them, I would expect a carb problem.
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Htown16, Houston, Texas
1978 T140E Bonneville, 2004 XL 1200R Sportster
Everything will be alright in the end.
If its not alright, its not the end.
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