I need some help from the experts with my VF700S. I'm finding that it takes much more cranking to start when using the fuel tank and factory petcock than it did when supplying fuel from a bottle and some tubing (no petcock). When using a basic bottle and tubing, it starts right up even after sitting for days. When using the fuel tank and petcock it needs to be cranked for 10 to 15 seconds before it will stumble to life, after sitting for a few days.
Please educate me if my thinking is wrong, but does that mean that the bowls are emptying out when it sits, and the cranking is required to open the petcock and re-fill the bowls? What would cause the bowls to empty after sitting for a day or two? I'm not seeing or smelling fuel leaking from the carbs, but it seems like it's going somewhere.
I recently rebuilt the carbs and the petcock. I put a new fuel screen on the petcock but did not see any parts that appeared to need replacing in the carbs.
Any troubleshooting tips would be appreciated...