What weight oil are you using? What about mod's and what grade of fuel? Proccess of elimination. Low grade fuel will cause (labor knock) pre det. Using too light of a oil can cause noises. Lugging engine!No Windshield, had one once, used it to ride to Vegas and threw it away when I got there.
The knock starts when the engine gets hots and it is not consistent, will start then stop and start again, doesn't matter what rpm's Im' at or what gear.
Okay let me sound blond, how do I check the oil pressure?