[flyingfrizzle]

Carl Moesly would place the tanks at the cg so that it would not cause a shift as fuel burned off and that works well if possible. With a heavy four stroke you will need that weight forward. The two tank deal will work well to keep the weight forward. You can burn from the rear tank and save the front for reserve. The small amount of gas burned in the second tank will not change the the cg much due to a honda 130 will not burn much unless u are running long distances. If you can gain perfect balance with a cg centered tank go for it but I personally think you will need the extra weight to make it balance. You could ballast weight but why use extra weight when you can utilize the fuel weight u have. If you do this with dual tanks make sure you can tie them together and as u re fill equalize the tanks and top of each one so the fuel stays fresh in both tanks.