Serviced carbs ran for a bit now won’t start.

I’m thinking “ if the plugs are dry, there’s no fuel getting to them. There’s only one way for it to get there.... through the fuel valve. If the floats are closing too soon, fuel won’t get through. It explains a startup, because you will have fuel get through initially While the floats are down, but then after the bowls fill up more they close and the level isn’t getting low enough for them to open again.”

 

check the wet set then adjust as needed

Setting the fuel levels

 

What do you mean by fuse holder

 

I’m still a bit stumped as I’m reading through. Am I reading that all 4 vacuum ports are capped? If so, your petcock has no vacuum to operate it. Without a vacuum line, you need either to set your petcock to PRI, or get an “on-off” style petcock.

also, check to make sure your tank cap vent isn’t plugged.