Bought a used seemed to be in descent shape 98 wr400. bike was cold and started up on the third kick. The rpm's seemed to bounce around, assumed from being cold. Ran the bike and it's strong. Replaced the air filter (twin air), new plug and the bike pops off, but won't stay running for over 10 seconds. So I yanked the carb off, and the jets are all over the place. The bike has white brother e series pipe. Main jet was 165, pilot jet 85, starter jet 70. Accel
pump rod is rusted along with the metal around the diaphram. I have all new oem
parts on order.
This is just a starting point to try and tune the carb in, any other suggestions would be helpful and is there anything else that may cause the bike not to stay running?