Here is a link to the [link=http://horizon.hobbyshopnow.com/ProdInfo/Files/MDSmanual.pdf]MDS .48 Engine Manual[/link]. Hope this helps. Now here is a question for you all because my O.S. .40Fx sometimes doesn't run properly. On my twin engine boat, i use a .40la, and a .40Fx. The Fx should have more power than the .40 la, but when i run both on 15%fuel the la outperforms the Fx. The Fx runs fine for a few mins and will go up to ful lthrottle for about 20 secs then the rpm's drop and it slowly bogs down. If i idle it, it runs fine again and then after about 30 secs if you open up the throttle it'll die. This has been getting better over time, as i put more hours on it. I bought this engine used, so it may not have been broken in properly. However, if i run 10%fuel the Fx doesn't have any of these problems until about maybe 2 mins of running WOT. But if i back off it's fine, and doesn't die at all. I have posted asking about this b4, in the engines forum, and I get the normal, check the fuel tank, check the lines, check this check that, and it's none of those normal remedies. I would rather run 15% or even higher for speed, but 10% can suffice. Anyone have any suggestions???