EXHAUST HOLE
Moderator: Moderator
EXHAUST HOLE
where do i drill that washer out at? i have that iowa spree with the restriction in the exhaust. where do i drill it out at?
As I understand, it should be at the engine end of the pipe. BUT there are some Iowa pipes (like mine) that don't have a washer, but longer narrow stretch at the beginning of the pipe.
The quickest way to know (unless you have the muffler off already) is to check against pics on the internet, as the kind with a washer is exactly the same design as a stock muffler.
The quickest way to know (unless you have the muffler off already) is to check against pics on the internet, as the kind with a washer is exactly the same design as a stock muffler.
1986 Spree w/ '87 SE50 motor
1985 Aero 50 w/ Dio motor: On Hold
1985 Aero 50 w/ Dio motor: On Hold
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- CBR1000RR
- Posts: 4957
- Joined: Sun Apr 16, 2006 11:51 am
- Location: Southern Michigan
The scoot in my sig had a restricted exhaust. There is a thick washer (probably 0.25" thick) welded just inside the head pipe. This washer effectively makes the entire exhaust 'narrower' by limiting the gas flow. As such, it increases back pressure, limiting overall engine performance.kerrbss wrote:pic please
Unfortunately, I haven't seen a pic of this washer anywhere, but this might suffice:


This was the first mod I ever did to my scoot, and really the first mechanical task ever for me. It's a very easy job that will take about 30-45 minutes with a dremel and a few grinding bits. Even though it's easy, it's quite beneficial--I saw a dramatic performance increase (note your top end won't improve if your pulley (aka variator) is restricted).
Conveniently for you, my exhaust was rusted to s*** and the muffler actually fell off whilst riding

2001 Elite S (SA50P)
- Nickname: "Black Magic" or "iPed"
- Derestricted
- OKO Hi-Speed Variator (9g rollers)
- 9:1 AM gears
- ~45 mph (on a good day
- Nickname: "Black Magic" or "iPed"
- Derestricted
- OKO Hi-Speed Variator (9g rollers)
- 9:1 AM gears
- ~45 mph (on a good day

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- Goped
- Posts: 80
- Joined: Sun Sep 14, 2008 10:15 pm
- Location: North Central Indiana
There's more where this came from! I went all discovery channel and took a bunch of pics and videos while I was working. I was planning on putting up a Tech Docs thread, but I wanted to post a few pics here, too.MotorMaker wrote:Put this in Tech Docs please![]()
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2001 Elite S (SA50P)
- Nickname: "Black Magic" or "iPed"
- Derestricted
- OKO Hi-Speed Variator (9g rollers)
- 9:1 AM gears
- ~45 mph (on a good day
- Nickname: "Black Magic" or "iPed"
- Derestricted
- OKO Hi-Speed Variator (9g rollers)
- 9:1 AM gears
- ~45 mph (on a good day
