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If you are tired of not being able to completely fill the gas tank and having the bubbling air escaping from the tank blow gas all over the tank top, you can solve this by adding a few air vent holes to the tank filler neck. I had to put 4 fairly good sized holes in the front and right side. The process is simple - just use a punch awl and ball-peen hammer to make the holes, as shown in the picture. Here are a few more tips: NEVER NEVER NEVER drill! Not only will that dump metal shavings into the tank, but all electric drill motors create sparks! When you use a punch awl, just put the tip in contact with the filler neck and hit it enough times to make the hole as large as the awl shank (not just a little hole from the tip). You will need a MINIMUM for four large holes to make a big difference. I have seen a suggestion to use wax paper between the awl and the tank neck to reduce the chance of sparks - no idea if that provides any value at all, but it can't hurt. I personally think there is no real risk of sparks from using this method. I also suggest putting a thick towel or something over the tank near the awl head so you do not accidentally slip and mar the tank with the hammer. A dead blow hammer would be an excellent choice for this job - less chance of slippage, and they are all covered in plastic. Several folks have said to do this with a full tank - I disagree. If it is too full, the vibrations from the hammer blows will splash gas all over you. If you have to do it with a full tank, place a rag over the opening. I think that any level below the filler neck is probably OK. And some important information about filling your tank AFTER you do this mod: You now have a CHOICE how full to make it, and that choice is important. If you fill it all the way to the top and then park it in the sun while you go have lunch, the heat will cause the fuel to expand and run out the overflow hose into a big puddle under the bike! Even just the engine heat can cause this, so my recommendation is simple - if you are going to ride at least 10 miles right after filling it up, put as much in as you want. But if you are just around the corner from home, or planning to take a break before getting back on the road, either wait to gas up until after the break, or keep the fuel level down near the bottom of the filler neck.
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