I started working on my FS130r because it was hard to start. I looked at the valve settings and the intake was a little bit off so I got the valves adjusted. I still had trouble starting it. Then I replaced a new carb, new fuel tank air vent. Still not start. Then squirt a small amount of premix fuel into the carb to see it it fires up. I started pull robs then i have no problem to start it up with first pull. But if I let it sit for 15 - 20 minutes and try to start it again it won't start again unles I squirt fuel into the carb. Any thoughts on this issue would be appreciated.