pics of stack braces

[dads70]

im really wanting to add a stack muffler on my lil 70 with a flapper valve on it, but want to add a support brace on it for additional support as not to damage the head i thinks someone made one but cant find the pics on how they did it

[Merk]

This is on my Son's 86:


The motor has studs in the head instead of bolts. The grey material is a product called header wrap. It keeps the heat inside the wrap and decal doesn't melt. 86 has more then 50 hours runtime in this picture:

[placeebo effect]

here is what i have so far on my 1450. the steel is from a bed frame and the muffler is off of my racing honda trx450r 4 wheeler that i put an aftermarket exhaust on.


This is the first real chance to get at my new mower. gonna have to redo the carb, tube the rear tires and add flextube to finish off the exhaust.

total cost for my mod:$5 for flex tube. these exhausts should be easy to get ahold of as almost anyone that buys one of these 450 class quads removes the stock exhaust. i would say 5 to 20 bucks on ebay.

[Matt G.]

Scott-

I would tie that main bracket into the head bolts or something more solid than the aluminum muffler box bracket, which is not strong enough. The OEM mufflers made those crack and break; that muffler will break it much faster.

Something else to think about: You have part of support hardware connected to the engine, and part of it connected to the tractor frame. The engine is going to move around a bit relative to the frame because of the engine mounts, so you're also likely to crack any or all of the pieces you are using to mount the muffler to the engine and frame.

[placeebo effect]

the bolts that hold the muffler are rubbermounted

[Matt G.]

That isn't going to keep the aluminum muffler box from cracking.

[placeebo effect]

as you know, on the quietlines they have those 2 studs sticking above the head. the aluminum box will get 86'ed and am planning to do a stand off on those and have a 1/4 inch plate that attaches to the mounting bracket.

other than that, what do you think of the setup.

[truckntran]

Originally Posted by placeebo effect

as you know, on the quietlines they have those 2 studs sticking above the head. the aluminum box will get 86'ed and am planning to do a stand off on those and have a 1/4 inch plate that attaches to the mounting bracket.

other than that, what do you think of the setup.

Now you're talking.... I'd still think about moving the muffler mounting to the engine tho... those quietline motors move a LOT..which you probably know already! Or use some sort of flex coupler to it..

Hey if that aluminum box and the sheet metal that used to be there is up for grabs, I need a set.......


Have you tried running the exhaust thru that muffler yet to see how it sounds ? It should look great hooked up, just curious about the exhaust note..

[Matt G.]

You can attach it to the two head studs, but it's still not going to be the best. That muffler is HUGE and is really going to get shaken by the engine. There is nothing to keep the muffler from moving forward and backward, which will also eventually crack your mounting brackets. My advice would be to use something a bit more practical for a muffler.

[lonnyb]

Heres a stack that I have used on different tractors





I use the stock muffler and just added a pipe and flapper.
The OEM support bracket holds all the weight.