Please Help! Exhaust Derestriction Woes!

[ttpb]

Hi all,

I have recently picked up a 2001 Vino on ebay. With the fabulous "How-To" for exhaust derestriction found on this site, I made my first attempt tonight. Turned out to be much more difficult than expected.

Removing the exhaust from the Vino was easy. Upon removal, I compared my pipe to the following picture:

http://www.provoscooter.com/shop/images/howto/exhaust/Figure13LRG.jpg

I must say that the picture above isn't too good really. I looked at my pipe and the one in the picture, I must admin I can't tell much of a difference (before any hammering and grinding at this point). The exception is that the metal gasket is orange-brown in colour (once I removed the black stuff) and that it is not flush to the mounting surface (the one in the picture seems to be really flush). Upon closer inspection, it would seem impossible for this gasket to be completely flush against the surface since the grove it fits in is too shallow. Is this normal?

Since I can't find a picture of an exhaust before the derestriction was done, I honestly don't know what "washer" I am supposed to remove. My only clue is that I found 3 welded joints at 0 degree, 120 degree and 240 degrees inside the pipe. The welded joins appears to be attaching a metal ring. I first tried the hammer technique without success. Then I tried to use a grind stone attachment piece with my drill to try to grind down the welds. I grind the weld flush against the inner wall of the pipe but still, nothng is loose. At this point, I am not even sure of the metal ring is permanently part of the pipe or just held there by the welds. Am I even looking at the right piece to remove?

Upon closer examination, I came to be conclusion that even if I can remove that metal ring, the diameter increase will be so small that I don't think it makes that much of a difference. Besides, the metal gasket seems to have a diameter smaller than the inside of the pipe even if I manage to remove the metal ring inside. I then tried to re-attach the exhaust without the gasket and my Vino was really noisy after starting. Then a inserted the gasket back and my Vino sounds the same as before. I ran a few laps out in the street and found acceleration seems to be a little quicker and an extra 3 km/h in top speed. Did I get the slight performance increase because I grind down the weld joints?

My Vino now tops out at 45km/h. I was hoping to get to 50-53km/h with the exhaust derestriction. Can anyone shed some light into my situation? Am I doing something seriously wrong? Perhaps I will take some pictures tomorrow so that I can get some suggestions/tips.

Thanks for all your help in advance.

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[Lennox]

yeah, we like pics.........


the 3 welds are in fact holding the "restrictor" in place. If you have a grinding stone, remove the washer and then some. Sounds like the gasket you left out that caused the noise?

[ttpb]

Here are two photos of the job I have done to my exhaust:

http://img11.paintedover.com/uploads/11/exhaust1.jpg

http://img11.paintedover.com/uploads/11/exhaust2.jpg

I have yet to remove the washer from the pipe. But honestly, I don't even know if there is a washer in there at all? After two hours of grinding, can anyone tell me if I can done a sufficient job?

Just before I installed the pipe back, I noticed something interesting:

http://img11.paintedover.com/uploads/11/manifold1.jpg

I seems like more the half of the cross section diameter is blocked with some black material. Is this normal? I tried grinding it but the stuff is really hard and I can't get anyone of it off. Does anyone else's manifold look the same as mine?

Thanks.

ttpb

[XPS1210]

The exhaust port should be only half the size of the hole... You could probably open it up but I don't know that would be totally healthy for a 50cc engine... I'm sure you'd get better power but unless you have an idea of what your doing, you might make the cylinder weak and make it have more problems...

Also... the exhaust shouldn't have anything that looks like a funnel inside it... If there is one... CUT THE CRAP OUT.... The pics you posted... I'd say you got more grinding to be done... Your trying to get the piece to fall out, not grind it all out... It should have a couple of welds that hold it on...

Sucks, but have fun grinding some more... What are you using to grind on it?



I edited your pic and you need to cut where the REDColor is... that should make that restrictor fall out... then you need to sand/grind the pipe till it's got a nice roll instead of a sharp edge...

[XPS1210]

Where do you live? are you right on the ocean?

That cylinder looks like crap... Might just want to go with a 70cc upgrade than to mess with that cylinder.... It's pretty rough looking...

Is the inside smooth? No rust on the inside of the cylinder? Any corrosion?

That would make me worry... relaiability, failure and leaving you stranded... etc...

Just a thought anyway...

[Shane]

Yeah, I have to agree. you are on the right track.

I just finished dialing in my friends '04 Vino.
I have a Zuma and would laugh at her when I would blow her away.
Now she is making me look like a Grandpa the way the Vino derestricted and "jetted" up.
Her Vino screams like a freakin' *****!

On yours, everything looked as it should.
Forget the grinding man!
Grab an old flathead screwdriver and pound the hell out of it on the welds.
I broke Sarah's exhaust "cone" off in less than a minute.
Then up-jet that thing!
I'll start a thread and show you how to do it.
You'll feel dangerous when your done!

[ttpb]

Hi,

Thanks for the detailed response (especially from jered).

Is the black material blocking half my exhaust port is normal? The wall on the side that is not covered up by the material is smooth. But the wall on the side of the black mater is kinda rough. Do all Vinos have half of the exhaust port blocked? Is it possible that this black material is the restrictor???

Regarding the exhaust pipe, can anyone see if my restricter washer is still there? The work you see in the picture is the effort after going through one drill grind stone. I believe I have grinded out all the welds but nothing seems to be following out though. If I was to use an hammer and screwdriver/chisel, what part of the exhaust in my pictures should I apply force?

I also bought the following dremel piece to do the cutting:

http://www.dremel.com/productdisplay/bit_template.asp?SKU=199&Color=009999

Is this dremel piece the right one to use to try to cut the washer out? I am concerned that I may drill a hole through the pipe with this piece.

Thanks for all the great help. BTW, I am in Toronto.

ttpb

[Lennox]

this is metal, and is part of the cylinder it comes half circle shaped stock.

clean all the gunk off, but do not remove any material

[Chreaus]

I Know what your saying about the small opening to the manifold.
It doesn't seem right that your opening your exhaust so much and it's still only getting air from the small manifold hole on the cylinder. I asked this question awhile back. It's a perpetiual debate I guess. Just get the cone out and wait an see what that little vino does.

Shane??? Whats with the up-jetting???
Did you post a new thread???

Keep on Scootin!!!!!!!! :cool:

[new guy]

Any luck getting the restrictor out? I just recently extracted mine what a difference. Next is the clutch govenor. Hey does anyone know is it fine to just do these mods? Or do you have to modify anything else to keep scoot running right?

[Shane]

"Shane??? Whats with the up-jetting???
Did you post a new thread???"


Go to the thread that's called "GOT A NEW VINO? TRY THIS".
I wrote instructions that show you step by step how to jet it.

Rock-on!

[King Vino]

We also have a section on up-jetting or as we call it here on Provo, rejetting. in the howto section.

[ttpb]

After I dremel-ed my exhaust a little bit more, I believe I have removed the restriction washer (or at least what was left of it after my grinding from two weekends ago). I need to get a new grind stone to smooth out my dremel-ing.

Acceleration has improved drastically. However, I only gained a few clicks in top speed (max out at about 30mph). This is about 1-2mph gain from what it was before the derestriction. Is 30mph a typical speed for a derestricted Vino? Or is mine simply on the slow end of the scale?

I was hoping to get a top speed of 35-38mph without after market parts. Would the variator degulation get me the top speed that I want? What else can I do to get a higher top speed? Bigger tires? Higher octane gas? Synthetic oil?

Thanks.

ttpb

[Shane]

You are on the right track.

Read the thread called- "Got a New Vino? Try This!"

It will explain everything you need to do.

[sooznd]

ttpb
How many miles are on your scooter? Has it been broken in yet?
By the way, you pictures are great. That's what mine washer looked like, too. I am able to get 38 mph after the exhaust alone.
Have you changed the trans oil or cheked the filter?
I din't need to upjet because of the high altitude in Colorado

[BlackVino]

Yo ttpb...

Thanks for starting this thread...i had the exact same problems de-restricting my pipe as well. It looked exactly like yours. After reading this i attempted this again....and yes it is just a funnel i just gave it a nice WACK and the thing came out!

Let me tell you...

My acceleration is amazing, i literally almost flew off the thing the first time a pulled the throttle back. Now and after just a quick little boot around the block (cause Im in T.O as well ...getting cold) i reached 60KMPH! my first time ever!

Thanks again...

I can't wait till spring so i can fly down the streets.

[ttpb]

sooznd:
I have a 2001 Vino with 4500km (2800miles) on it. I guess it is broken in.... :) The air filter is what I am going to check next. I haven't changed the trans. oil either. Does the trans. oil make that much of a difference? I should change the oil anyways. I would love to get that extra 8mph that you have with simply a exhaust derestriction.

BlackVino:
Yeah!!!! A fellow Vino enthusiast in Toronto!!! Where are you located? Unlike your exhaust restrictor, mine is a washer (pre 2002 model) instead of a funnel. Wow!! 60kph??? What other mods have you done?

After reading through the variator derestriction instructions, I have gained sufficient confidence to attempt it. Hopefully I will get the 60kph (38mph) top speed I want.

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[BlackVino]

ttpb

Yup i sure do love that exaust derestriction....although i have to ease up on the throttle now. I'm located in scarborough, the only other mod i have done is the Variator de-restrict. Hope fully you have a big enough clamp thinggy to hold the varitator in place while you un-bolt. Or if you need one you can use mine.

I think i could have gotten the thing over 60KPH but i wasnt dressed properly to go for a real ride...maybe tomorrow. (i hate toronto winters)