Hey guys, just recently rebuilt the carby of a DRZ I bought off a fella that played with the jets and fuel mixture and have returned everything to factory but am having issues with tuning. I took the bike for a spin through the bush to open it up and tune it but have noticed that the fuel screw seems to turn with the vibrations and turns to lean up the fuel mixture making the bike run rough after about 35-40 minutes of riding. Just wondering if anyone has come across this issue before and knows if a slightly bigger O-ring may fix it or if it’s a case of just sticking some blue tac or something around it as I have a longer fuel screw so I can adjust it with the carby in. Screw is 3.5 turns out but runs and idles at its best at 4 turns out.
It’s an Australian DRZ400E with a FCR39mm carby.