When I first bought my QL cub it rattled like a can full of pea gravel. I would say 75% of it was the engine needed a good tune up, After a plug and points,setting the timing properly, a new coil adjusting the idle on the carb it ran lots smoother.
I then put some woodstove door gasket on that tin muffler box and shut it up for good. I put a light bead of red rtv under the front part of the hood under where it closes, covered it with wax paper and shut it--better yet.
Last The bottom mounts where somewhat squished so I moved all the tops to the bottom and then took some of those big automotive shock absorber bushings from monroe truck shocks (they are exactly the right thickness for the washer but larger in surface area) and put the metals in those for the tops and snugged them down until I had about a thread and a half showing.
I then ran around the yard in complete awe thinking the whole time why they call these Quietlines. Quiet as a mouse only tiny vibration a idle and smooth as silk at any other speed including WOT. Now the loudest thing on it is the hydro noise
Hope this helps- try the shock absorber bushing thingy if your a cheapskate like me, it works. I have not tried them on the bottom but will certainly try it next time.
I will fly to Africa and chop down a rubber tree before I give MTD 80 big ones for 4 sets that are nothing more that 2 fifty cent rubber bushings and a bolt and washers. I could care less if the current CEO has to walk instead of fly in his Lear jet... He won't be doing it on my dime.
"Son, money don't come with instructions" Grandpa
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