Restriction in Exhaust

[Garn 1]

I found this exhaust pipe with this restriction pressed into the flange end. It seems to me that engine should not run, possibly it could with reduced power.

I'm having trouble with the picture, please let me know if it is not complete.

The aperture of the restriction is approx 16mm dia. The pipe is approx 40mm inside diameter.

RegardZ

[Z1parR]

Only a third of the pic there mate .

[z1bman]

shite picture garn

[Z1parR]

What is the header off Garn and is it from Aus or overseas .

[Garn 1]

Must have run out of photobucket memory REDID ORIGINAL
Ill try again when I review the situation.
You won't believe the restriction.

I tried rotating 180 degrees to fix the photo,
result was it only gave me 1/8 of the picture. THis is my last try.. Oh there it is, blo*dy small.
<a href="http://smg.photobucket.com/user/garn/media/exhaust_zpsd2db0ff4.jpg.html" target="_blank"><img src="http://img.photobucket.com/albums/v626/garn/th_exhaust_zpsd2db0ff4.jpg" border="0" alt="Exhaust photo exhaust_zpsd2db0ff4.jpg" style=""></a>
Z1parR,Its a standard pipe however these restrictions are not standard. It's fitted to a TX500 and a pressed fit into the two exhausts pipes. JUst can't understand why these restrictions are there, they have been removed now.

[RGH]

Factory/dealer fitted power restrictor to suit certain country's.

Ripe her out, give the ole girl some more ooommmppphh.

Check carb inlet, usually one in there aswell/too.

[big green bus]

the 33bhp restrictors fitted in the UK to bikes of new riders look very similar but fitted into the inlet tract

[Garn 1]

Thanks guys, I will pass the info onto the Yamaha Tx500 forum.
and give the accreditation to this forum and another Oz one.
I would love to know what the inlet tract restrictor looked like?
Maybe similar mounted behind the inlet manifold.
It makes more sense to have one at inlet and a similar one at exhaust
RegardZ.

[big green bus]

[img][img]http://i150.photobucket.com/albums/s82/worringtonminge/33s_zpsc04c6e56.png[/img]
[/img]

[Z1parR]

As the guys before me have already said Garn it looks like the power restrictors fitted to UK and maybe other countries learner bikes dependent on level of bike licence .

[Garn 1]

Just when I thought I knew a lot about motorcycles!
The bike in question must have suffered for over 30 years.
Thanks guys.

BigGreenBus..... Do you recall what bike you have in carb pic?
Also, what is the small coin size disc?
Looks as so they were definitly factory supplied by the patt# on the washers!
RegardZ.

[Z1parR]

You probably did know mate , too much sun however may have clouded the memory .
That's the reason we remembered

[jimmock]

A restricted "learner legal" Z1???

[kas750]

You probably did know mate , too much sun however may have clouded the memory .
That's the reason we remembered

[hillbilly]

a lot of fiftys in the seventys had washers in between the head and exhaust pipe,when ever someone bought one,the first job was to strip zorst off and remove it,the other way they restricted them,was a long thin tube down full length of exhaust.