Questions on exhaust.

I got a free mower the other day that didn't a header or muffler and i need to build some kind of exhaust for it. I'm not to worried about looks, but I am on things like back pressure, performance and valves. Can someone clear some light on the subject.


My dad thought stacks would be cool.

O and if it helps, the engine is a 12.5hp 1995 Briggs and Stratton with both a (I believe) 1" thread and flange exhaust mount.

The simplest way would be to build one out of 1" pipe.

a couple of elbows should give enough backpressure.

It will need to be supported to avoid broken threads or cracked cylinder head.

Can I use about two 90 degree or two 45s.

Yeah you can use 90* if you want.

Nathan43 wrote:

Can I use about two 90 degree or two 45s.

Which ever ones you like.

Adding more bends equals more back pressure and a bit quieter noise

This might seem stupid but can i put a mufler about halfway up the stack so it isnt that loud. (neighbors )If it would work i have either a push mower mufler and a 20hp koler mufler. Note: This is going on a 12.5 horespower flathead briggs.

Nathan43 wrote:

This might seem stupid but can i put a mufler about halfway up the stack so it isnt that loud. (neighbors )If it would work i have either a push mower mufler and a 20hp koler mufler. Note: This is going on a 12.5 horespower flathead briggs.

I have the same motor. do you have the same mower as me?

Doubt it I have a 95 Wizard. I believe it is just a renamed mower made by a bigger company. I'll post a few pics give me a min.

Ok thanks, sweet man

[img][/img]
[img][/img]
[img][/img]
Here she is, my current project.Not the original seat or tires.
Oh and I used fearless fronts wiring diagram for a briggs, how do i wire the headlights that's the only part I didn't understand.

Nathan43 wrote:

This might seem stupid but can i put a mufler about halfway up the stack so it isnt that loud. (neighbors )If it would work i have either a push mower mufler and a 20hp koler mufler. Note: This is going on a 12.5 horespower flathead briggs.

For a muffler use something wiyh at least (or bigger) inlet size as the pipe you are using for exhaust.

Or you can buy a small tractor muffler and modify it to fit.

sweet pics man. And there shoulf be two wires and a plug that come out near the dipstick. that's how it is on mine, or was. I just plug in the lights, and the power goes to the bulbs, and then a ground wire is on the front of the motor.

So I connect one wire from the lights to the side of the plug that does not have the diode and the other wire from the lights to a switch and then to a ground. Oh and thanks for the great help ill post a build topic one day.

yea no problameo. I took my lights off temporarily once. then I stepped on them ;-;