Hi, I am coming to the end of putting together a Midstar. The plans show a 4 stroke engine but I am using an OS 46AX. The engine mount , if I am reading the plans right has the engine a bit lower than my other models. To get thisa to work I will have to dremel a slot for the needle valve and also a bit for the muffler to clear. Does this sound right or did I screw up and have the engine mounted too low?!? Thankx for your time, Fast!