untill62
CB750 Enthusiast
Need help with my 1974. Within 10 miles after putting in new plugs, they start to carbon up. I use NDG D-7ES, new gas, new air filter. I have to run a wire thru the slow jet at least twice a year to open it up. Slow jet is marked 40. Not sure if that has an impact or not because it runs pretty well over 3000rpm, but sputters under and then I look at plugs and they are carboned up. I did awhile ago lightly clean the cylinders and put on new rings, not that it should matter? Boy, I hope someone has a suggestion, I'm lost.
Last edited: