Could u tell me what the setting is for LSN for the STS .28 as i received no manual only th box and the engine. Ive done everthing thats list , i change the fuel line, change the fuel tank. The gasket is brand new with the engine so it can be that. I have the hpi ribbed tuned pipe on it so im not to sure if that give a lot of back pressure. It still is revving high and im starting to lose confidence with this engine.