I have a Seagulls 260 Extra with a Saito 100 on it. My question is how do you keep the muffler tight? I have already balanced the prop(s) with a good magnetic prop balancer. The cowl is not touching it anywhere. I have put a new pipe and muffler on it really tightening it down really good with blue loctite on it. I have even tried a big dollop of JB Weld to hold it on. Nothing seems to be working. A new muffler assembly will, if loctite is used on muffler and jam nut, stay tight for two or three flights but, then it will works loose. After it works loose one time you get one flight out of it then carry it back to the shop clean every thing up good with alcohol and try again after going through the loctite process . Then one more flight. Mufflers are 30 bucks and that will only get you 2-4 flights. That is too expensive. I have other engines I have never had this problem with. This is my first 4 stroke. Are they all like this. Before I say I'll never own another Saito or four stroke for that matter is this common with all of them?????