i ride polini e-50 with 19mm dellorto carb...
i tuned it in last weekend. followed all the steps n stuff and my bike was running pretty sweeet, yeah like rippin. i rode to work today(like 15 miles or so) and felt like i was getting more outta my carb than i have before which was rad. it was going good off the line, mid range and top end was killin it. about halfway to work i decided to put a new plug in just for kicks and to see what kind of a mixture i was getting. got to work and there was little color to the plug. what color was there was lookin alright, a little lean i thought and decided to tinker with some stuff...
i took off the bowl of my carb and the main jet was just sitting in it. it came out but i have no idea when(presumably while riding...).
any one else have this happen to ya? your main jet isn't in but somehow your bike is working better than it was before?
i ended up spending some time adjusting shit on the carb but haven't been able to achieve the same results as before. it's now back to how it was when i tuned it last weekend and is sucking balls...wha happen?