removing restrictor inside the muffler

spreefreak · Post by **spreefreak** » Sat Aug 13, 2005 12:08 pm

how do i remove the restrictor inside the muffler of an Iowa spree.

vette76 · Post by **vette76** » Sat Aug 13, 2005 1:02 pm

its in the head pipe inside the header flange. pull off the exhaust and either find a step bit or a dremel and drill out the washer so it is the same dia. as the pipe.

spreefreak · Post by **spreefreak** » Sat Aug 13, 2005 9:34 pm

would you have step by step instructions, I'm new at this

burnt_toast · Post by **burnt_toast** » Mon Aug 15, 2005 12:54 am

1. take off muffler (easy enough)
2. drill out washer to deristrict muffler
3. install muffler back on.

there ya go.

spreefreak · Post by **spreefreak** » Mon Aug 15, 2005 11:52 am

but do i need to change the jet?

burnt_toast · Post by **burnt_toast** » Mon Aug 15, 2005 12:01 pm

spreefreak wrote:but do i need to change the jet?

I don't think you do, stock jet should be able to do unrestricted.

Post by **noiseguy** » Mon Aug 15, 2005 1:33 pm

No, don't rejet. It should be a #65 for stock intake and exhaust (Iowa or not.)

spreefreak · Post by **spreefreak** » Mon Aug 15, 2005 6:29 pm

Great

spreefreak · Post by **spreefreak** » Mon Aug 15, 2005 10:37 pm

does the restrictor look like a washer or what? is at the opening of the muffler when you take it off?

vette76 · Post by **vette76** » Tue Aug 16, 2005 2:16 am

yes looks like a washer. about a 1/4" hole that should be a 1" hole. u will see it when exhaust is removed.

kwosha · Post by **kwosha** » Tue Aug 16, 2005 10:14 am

just curious when reading this.....does anyone know if there is a restrictor on the 1983 Aero 50 (NB50M)??

thanks

Post by **noiseguy** » Tue Aug 16, 2005 11:24 am

Not that we're aware of. This is a regulation item on Spree "Iowa" editions.

spreefreak · Post by **spreefreak** » Tue Aug 16, 2005 7:09 pm

yes it is i will probably do this soon let everyone know

spreefreak · Post by **spreefreak** » Wed Aug 17, 2005 9:34 pm

didnt drill out the restrictor but cleaned the carb and went from 15 mph to 25 mph, which is a great improvment in my eyes. I have only put about $100 - $110 into it since I got it from my uncle who was gonna throw it away. It rocks!!!! I'm thinking about painting it any suggestions on the color it is Red right now its the original color.

Rowbear · Post by **Rowbear** » Mon May 17, 2010 5:13 pm

I have an Iowa spree that tops out in the low 20s with me on it (175lbs) and around 26 with my wife. I took the muffler off while ago to see the restrictor but I'm not sure I know what you guys are talking about. There is a washer type piece that allows the muffler pipe to form a seal with the flange piece from the engine and that comes out, but that wouldn't restrict flow since it fits around the muffler pipe. Other than that I don't see anything that looks like a washer. Then inside the flange it just kind of funnels down to a small (maybe 1/4' opening). Is this funneling type piece the restrictor? How do you drill that out since the frame is in the way? Anyone got a picture?

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removing restrictor inside the muffler

removing restrictor inside the muffler

Re: removing restrictor inside the muffler