So here is the run down i bought a 1973 honda cl350 when i bought it the mufflers had a million holes in them. So i cut the mufflers of and placed on some shorty mufflers on each separate pipe. The airbox was filthy so i took them of and placed k and n separate cone filters on the carbs. Here is the complaint when im riding the bike and the motor hits around 5000 6000 rpm the motor starts to give this popping back fire and eventually bogs down . I did some research and the remedys were to check ignition timing which is perfect, clean the carb which was done about 4 times and are perfect, raise the needle which cant be done the 350 needles or put in a bigger main jets in so i did that. The stock main jet was a 115 so i put in 120 and i have 125s by the way. I did some more research and found out that those small japaneese bikes need a lot of back pressure and i dont think that those shorty mufflers have enough knowing that the baffles are really thin so i made my own baffles i welded a fender washer to a bolt and bolted it inside of the muffler about a inch away from the opening on each pipe the bike sounds great but i am having the same problem but around 7000 8000 rpm. what should i do now any input is welcome please respond
