Modern Vespa

Modern Classics in DC recommended a Sito exhaust. They seem like a very good establishment. Browsing MV I have heard mixed reviews for the Sito.

I am interested in better acceleration in first and second. I don't want to increase the noise much if that can be avoided. I am not too interested in the top end speed as I have a GTV if I want to go fast (but faster would be better of course).

Any advice?

It will sound like a friggin popcorn machine. Seriously, if you want to go more than stock get the SIP road pipe. Nicer sound plus a nice boost.

Sip road pipe is amazing

Be3 atomizer
160 air correction jet
102 main jet
55/160 idle jet

And you will be rocking

That's exactly the same as mine set up + drill two holes on heart, sound deep and not too loud, but can go 65mph and above (indicated).

Sounds great, thanks. Can you keep the spare tire on and can you remove the rear wheel with the SIP road pipe in place?

To install the pipe you will have to get help to either hold the scooter up it use a lift to prop up the back and remove the main drive wheel to bolt on the pipe. But as long as you get the standard sip road not the one with the long exhaust tips you can keep and remove the tire and spare without a problem.

I used a small automotive jack in the location shown to simulate the rear tire still on, jacked it up enough while on the center stand to remove the tire for install. Just be careful infact i would still get someone to hold the bike steady its stable but anything can happen. And yes I have my px in the house

Thanks for the info and pics. I thought this exhaust had a long tail pipe that was supposed to extend more or less where the spare tire sits and I had heard that once installed you could not remove the rear wheel without removing the exhaust. I must be confused. Could you post a link to the exact model you are talking about or at least give me a starting point to look? I was looking on the SIP Germany website - are we talking the same SIP?

Thanks

I think this one is the short pipe version and sport is the long one.

http://www.sip-scootershop.com/EN/Products/24166200/Racing+Exhaust+SIP+ROAD+20+.aspx?_country=E993AB67-6807-4109-BBED-F6374EBF9F9B&gpc_origin=pla&gpc_feed_alias=us&gclid=COmZnevZ3LcCFVIV7Aod8BcA_A

Thanks, I got it now, I was looking at the sport. The short pipe model seems to improve performance with no reduction in functionality. A few more questions:

Is there an increase in performance with this exhaust if you do not rejet? I think I could switch out the exhausts fairly easily, but I am not sure I have the skill and experience to attempt the rejetting.

If rejetting is a must, what should I expect to pay to have a pro do it?

Are any adjustments needed to install this exhaust on a 2005 PX 150 for the US market or will the engine and frame attachments be the same as the stock exhaust?

Does this exhaust interfere in any way with the center stand springs etc. and/or the spare tire?

Thanks so much. I learned a ton of real life, do-it-yourself skills from my Dad, but unfortunately auto mechanics beyond basic maintenance was not one of them.

If you don't rejet you might get a mile before burning up your motor. The px as you know is an air cooled, carbureted, 2 stroke they are very dependent on a proper fuel air mixture

Adding a pipe changes the properties of air and fuel and your carb jets NEED to be changed to the ones I listed above

Rejetting is very easy, just get said size dellorto si jets. Remove the black carb filter cover 2 philips, remove the filter 2 flat head, and the jets are right near the air intake throat, they are small around (one bigger) and have a slotted head. And are brass color. The idle jet is by itself and smaller. The air corrector, atomizer aka mixer jet, and main jet all push into each other also know as the main stack.

I attached a picture of the carb with the filter off, the long slotted head screw that sticks out of the black filter cover is the idle speed adjustment, the brass slotted things right near it are the jets. There is also a mixture jet which is hard to get to without a special shape 6mm wrench but you shouldn't have to adjust that if just upjetting for the pipe and that's it

And no it doesn't interfere with spare of center stand, the center stand isn't mounted to the pipe, and infact the sip pipe is smaller than the original. Unless you get the pointless (though some people like it) sip road sport pipe which adds no more benefit over the standard sip road I have and pictured. The spare tire is completely accessible as well.

So just remove and replace with no major trial and error or adjustments? Did you get the jets from SIP when you ordered the exhaust? I have ordered from them before a couple of years ago and they were great to deal with.

Order these parts

Main air correction jet 160
http://www.sip-scootershop.com/en/products/main+air+correction+jet+si+_58274000

Mixer tube be3
http://www.sip-scootershop.com/en/products/mixer+tube+dellorto+be3+_40406000

Idle jet 55/160
http://www.sip-scootershop.com/en/products/~/products/idle+jet+si+dellorto+55160_40265516

Main jet 102
http://www.sip-scootershop.com/en/products/jet+si+dellorto+102+_40261020

Sip road pipe


Edit hold on the link for the pipe keeps redirecting to the sport long tip version

Edit 2
It looks like the normal sip road pipe is either discontinued or very out of stock. Even if I click it from old order history it redirects to the sport version which will hinder your spare tire

Edit 3
They have the chrome version of the standard sip road pipe but it will be a tiny bit tinnier sounding as the chrome process requires them to not put any mesh packing in the pipe
http://www.sip-scootershop.com/en/products/racing+exhaust+sip+road+for_24166100

I don't know what to say about the normal black one not being available at all for px80-150 and for px200, the stock status is red, usually yellow status means out of stock and on order and red means discontinued

Edit 4

Ok my mistake someone had linked to the new version of the pipe they are apparently calling it 2.0

This is the pipe you want http://www.sip-scootershop.com/EN/Products/24166200/Racing+Exhaust+SIP+ROAD+20+.aspx?_country=E993AB67-6807-4109-BBED-F6374EBF9F9B&gpc_origin=pla&gpc_feed_alias=us&gclid=COmZnevZ3LcCFVIV7Aod8BcA_A

The difference from the 1.0 which hasn't been made for a long time and the 2.0 (which I have) is they added the ability to attach included springs to the header pipe to a mount on the motor in the event the clamp comes lose the pipe won't fall off the exhaust port of the motor

Could someone please post the above set up for a px200e?

I understand Piston Ported can do a tweak to the pipes that enables you to get your wheel off WITH the sexy sport version.

Hey RevToTheRedline - great stuff you have been posting here. This one that roggerdavid posted looks like the same one still available except not the chrome version you referenced. What do you think?

That pipe and scoot look familiar I'm not sure if Peat is doing the mod anymore, but it cant hurt asking. I love mine, nice sound, and great performance. With the mod I can get the tire off w/out dropping the pipe. I did not have to take off the rear wheel to get the pipe on, btw. I just let air out of the back tire and squeezed the bolt past, not too hard to do if you let enough air out. I would recomend that pipe to anyone. I had a Polini right hand on there before and hated it. [/b]

I know we've had this conversation before but...
SIP Road Pipe
I really do prefer the sound of the Sito+ over the SIP Road.
I thought the SIP was too whiny.
What I really want is the purr of the original with the performance of the Sito or the SIP.

But you can't go wrong with either one - as long as you follow the wisdom above about jetting.
And take it from me, if you can install an exhaust, you can handle the jetting. Piece of cake!

Thanks - I love the vote of confidence! Wouldn't it be great if the exhaust just came with the recommended jets?

Yeah but for who? Someone at sealevel or some one at 5000 feet like me?

I've got my basket filled with those 4 jets and the SIP Road 2.0 Black.

Might there be anything else I may need going from 05 PX150 stock jets and catalyzed exhaust? Maybe an extra main jet to try, I dunno? Want to have all the bases covered in one shipment as those parts are cheap and don't mind spending a bit extra to do so.

I'm in Ottawa, a few hundred feet above sea level up to Gatineau mountains.

Really excited to try this pipe!

On a side note - was contemplating the 226 hot wing but can't justify performance to price (3x+) ratio...

I'm envious! Ahh, it'll happen soon enough for me. So I read somewhere else here on MV about changing out the slide because of slight stuttering?

It'll be nice to hear your followup!

If you want to wait... this is actually looking good.. 1st pics I've sen so far from Scooter Center. I like the flange... very S&S of them.. and the dynos on the blog look good...

http://blog.scooter-center.com/vespa-auspuff-mb-bgm-vbig-box-update/?lang=en

Thanks to all of the help I have gotten on MV, I just pulled the trigger and ordered from SIP. I am getting the exact setup that RevToTheRedline recommended for the SIP road pipe. No offense to Aiosi who makes a good argument for the Sito (which is what was recommended to me to begin with). It looks like numnumcook may have already placed the same order I just did!

I know so many of you out there can do this stuff in your sleep, so I really appreciate your helping out the more challenged among us (referring to myself, of course).

Now I'm just looking forward to doing the installation, and if that works out, enjoying the performance boost!

Thanks again to everybody who helped me with this project and encouraged me that I could do it. The shipment from SIP was supposed to come today, but it came yesterday while I was assembling my makeshift lift. With some help from last night's thread I got the old exhaust off with some difficulty today. As you guys said, the jets were actually way easier to do than the exhaust itself. Thanks again to RevToTheRedline for spoon feeding the instructions and parts to me.

I took a test drive and the performance is remarkably improved. I really wanted more power in first and second and got it for sure. I love the rumble, rumble of the engine - it sounds great! I may check back with you guys tomorrow after the drive to and from work if I have more questions.

I took a bunch of pictures during the install, but I think this one is my favorite as I was just about done.

outstandingly clean scoot w/ new muff & tricky plate = win!

plus now you're a Vespa mechanic

Nice plate!

Glad you're enjoying it.

+1

Congratulations - good job! I'm looking forward to doing the same thing myself. Gonna put a couple of hundred miles on it first, and save up a little cash... Always that pesky cash.

Awesome job

Wow ! Thanks guys I'm kind of a lurker to M.V. but I just picked up a 2005 PX150 limited with like 50 miles on it. Think I will follows Piglets lead !

No offense taken. It's pretty much a win/win choice... they are both good.
As an aside...
I mangled my Sito+ last week going up over a curb to park (stupid, I know).
So I put my SIP Road back on.
I still prefer the sound of the Sito but not so much that I am adverse to using the SIP.
From now on my recommendation will be to buy one of each.
You never know when you might need a spare.

So I have a 08 150 Stella with an ASC Big Bore exhaust. The blue filter media removed, and the famous 5 and 7MM holes drilled. I'm at roughly 2700 ft elevation. Should I go with same but a 100 or 101 main jet?

I recently purchased it and it had the 94 main. I read that in needs a 100 asap so I got one. But the rest of the jetting is still stock and seems a bit wheezy.

TIA!

Nice Zoomer! What number is your PX150? Looks just like mine! (#366). I'm getting to roll over 1,000 miles on the stock (I've put 300 of those). Can't spend any money on it though for a while. When I do, this is going to be the first mod I do, after talking to Hot Rod Al of course to see if he thinks I should go a different way...

OmH! I just noticed that! What a score! And I recently got an 08 Stella with 619 miles on it and all the rubber is shot. Oh I knew I should have held out for a "real" Vespa (no offense Stella fans!). Well...that's what happens in Idaho... older style Vespa's are not common. There are a lot more Stella's around here...

My px150 is #50 I've put about 300 miles on it. I also have a gts300 , after riding the px for a while I'm actually liken it a little more with the shifting thing but it needs a little more power. I'm not a big fan of the color and have considered paint but I'm gettin a little flack about painting a limited addition.

I think the setup for 200cc was posted in some other threads.

If I recall, folks were recommending changing (retarding?) the timing with the SIP Road. Is this agreed upon?

Okay, I'm about to order these parts for my PX150 (2005). My question is, is there any harm in installing the exhaust first without the jets and mixing tube? I just would like to get it on there and then deal with the carb.

Warning, I am somewhat mechanically inclined but I am a total newb with 2 strokes.

Assuming you get all the parts at the same time you can do the jets in just a few minutes - it is surprisingly very easy. Hardest part dealing with the exhaust is getting the old one off to begin with and getting the wheel back on to finish. I deflated my tire to get it back on which made it a lot easier.