Hi, I recently bought a 1975 Suzuki RL250. It ran but not well. I found that the main jet was plugged. After carefully cleaning it out and blowing it dry with compressed air, I reassembled the carb, gassed it up and it started easily. It runs for a while but looses power in a couple minutes and then stalls. it will not restart until it cools down. Any suggestions as to how to adjust the carb? It has a 130 main jet. I'm running modern synthetic oil at 40:1.