I have gutted the muffler and I am waiting on my carb. I ordered a wt 499. its supose to work with methonal should be here in a week. anybody use a wt 499? the ring looks good but I think I will order another one. Now it shakes bad when it idles but it shook before the prop is balanced . As far as the prop i think i am using an 18-10 or an 18-8 before I started the switch over to gas to glow the engine would pull my 15lb ulta spad stick around prety good that is with a stock engine with a magneto. What rpm should I be looking for? I well keep you all posted when I get it all together michael