When you say hole, are you talking about the passage way to the cylinder? If so, that most likely means your float needle for that cylinder is stuck.

 

Okay got carbs rebuilt with new float needles and installed new filter and bike seems to be running good again. Nextra question is how important are the two ports on the back of the gas tank. I think one is a vacuum line and the other is the overfill line? Since I have had the bike neither of these have been hooked up.

 

I would. You want your vacuum air to be cool and having the hose will help with that. Also the other is the overflow. When it's doing its job, you want the fuel on the ground, not on your engine.

 

I wouldnt bother with the vacuum hose. It just lets air into the tank as the fuel decrease. I dont believe temperature would affect it since the tank is above a hot engine and out in sun warming the fuel anyway. As far as the overflow, it would drip on your shock not the engine, been there, done that. Neither one of mine are hooked up. A little water from rain and washing the bike aint gonna hurt, and just be careful and dont overflow the tank.