cpazambrana
XS400 Member
Hi to all. I have a 1980 XS400G with brand new Mikuni VM34 carbs. The bike idles perfect at q200 rpm and runs fine but won't get past 4000 rpm when running. After that she is not responding and she keeps running but losses throttle response after 4000 rpm. As I mentioned the carbs are brand new and original but I left the stock jets that comes with the carbs which are 260 main and 35 pilot. I adjusted the air/fuel screw to the T and bench-sync the carbs. Will I need to go to the bike original carbs pilot jet size of 42.5? Any help will be greatly appreciated.