I have grease to lubricate the brake pistons. The o-rings are in excellent condition. Yes, I have the jets set in the right way. But I have to admit that I had a problem with one in the fourth carburetor. All 3 were in place, but one fell out after removing the holder. When I tried to mount it again, it wouldn't go all the way in. Even pressing with a wooden stick didn't help, I couldn't set it perfectly in the axis. Only by screwing in the holder I managed to push it in, using some grease. But the problem is that once it was in place, I noticed a small metal chip on the top of the nozzle. I hope it is not damaged. Does this nozzle have to be perfectly sealed in the cylinder, or does it only stabilize the needle track? The needle moves smoothly in it. This the nozzle falls out easly but it is very difficult to push it in.