New exhaust for Pack Rat the AC B-110

[8ntruck 9,246]

I've been working on Pac Rat, the AC B-110's, clutch.  Replacing some missing plastic liners and washers took the grabbyness out of it.  An adjustment made gear changes easier.  I stopped at the hardware store and ordered a carb rebuild kit to hopefully tame the backfiring.

 

I obtained a new muffler from @WHX?? recently, planning on using it on this tractor.  In a hand mock up, it looks like it will make a good mini stack.  I got a little deeper into that today.  The original pipe backed right out of the exhaust port threads - suprise, suprise.  On the bench, i discover that the 1" iron exhaust is a bunch smaller than the ID of the new muffler. 

 

Adaptor time.  It appears that stepping up to a 1 1/4" pipe will get me a heavy press fit into the muffler.  That is what they make disc grinders for, though a bench mounted belt sander or even a lathe would be wonderful.  Trip #2 to the hardware store for this project tomorrow.

[WHX?? 57,923]

And the  are where??

[8ntruck 9,246]

Nufin' much to take a picture of- yet.

[ebinmaine 80,465]

12 hours ago, WHX?? said:

And the  are where??

 

10 hours ago, 8ntruck said:

Nufin' much to take a picture of- yet.

 

Old tractor  makes cool photos.  

[8ntruck 9,246]

PICTURES!!!!!!!

 

After

 

 

 

Before

 

I guess that the new muffler is quieter,  'cause the backfires now sound louder.

 

I fired it up just after the sun set.  It is very definitely backfiring through the exhaust - yellow flame out of the stack about 18" long!

 

The backfire is not as bad with a bit of choke applied, so as soon as the B&S jet removal tool arrives, I'll start with a carb rebuild.

 

If that does not help, the head will come off to get a good look at the valves.  Sticky? Out of adjustment? Need reseating?

Edited August 21 by 8ntruck