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Message started by Arcreefer on 08/17/16 at 17:03:20

Title: Dyna Muffler Question +
Post by Arcreefer on 08/17/16 at 17:03:20

After reading a lot of posts here I decided to install the raptor petcock, K&N flat filter, 150 main jet, 52.5 pilot jet, half spacer, adjust idle mixture screw, Autolite XS4163 Iridium plug. I also replaced the battery with a 220 cca agm and I ordered a Dyna muffler off ebay. Dyna just arrived today and it's hollow. No baffles, nothing inside it. I understand the engine needs some back pressure. Any suggestions? Also, I ride mostly at sea level, do the jets sounds about right (150 main, 52.5 pilot), with the half spacer and the Dyna muff?

Title: Re: Dyna Muffler Question +
Post by justin_o_guy2 on 08/17/16 at 17:27:36

You still Might be able to get it to work. I think it's possible to drive a freeze plug in, if other stuff is healthy inside.
Others will be along to fill in the blanks.

Title: Re: Dyna Muffler Question +
Post by Kris01 on 08/17/16 at 18:16:57

I'm around 200-300' ASL. In my opinion, that's sea level. Those are the same jet sizes I'm running. You should be ok. With a gutted Dyna you might need a little bit larger jets. Maybe.

Title: Re: Dyna Muffler Question +
Post by Dave on 08/17/16 at 18:30:45

If you used PayPal to buy the muffler, and the fellow didn't tell you the baffle was not intact - you most likely file a claim and get your money back.

If you want to keep the muffler.....get a 1-1/4" freeze plug from an automotive parts store. Drive it in from the inlet side to the point where the old plug used to be......look down the muffler with a flash light and look for evidence of where the old plug was spot welded in. There should be a small area without holes.....more holes will likely be on the back side than the front side - that is the point where the plug should be.

Title: Re: Dyna Muffler Question +
Post by Arcreefer on 08/17/16 at 18:41:30

Thanks Guys! Dave, would there still be enough room around the freeze plug to allow exhaust to blow by and still hold the plug in place?

Title: Re: Dyna Muffler Question +
Post by batman on 08/17/16 at 20:20:40

The plug is a press fit into the center pipe ,you will have to drive it in,the exhaust gases are forced to go into the holes in front ,around the plug ,then back through the hole to the center pipe to exit.the plug(baffle) gives you the back pressure to let you tune the carb easily.the plug won't move.

Title: Re: Dyna Muffler Question +
Post by Arcreefer on 08/18/16 at 12:36:30

Thanks Batman!