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carnaby 125
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carnaby 125
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UTC quote
I hear people on here removing it but on my piaggio 125 is a different evap system to vespa

I would after blank plate it that's only option

also is there any point removing it

I don't have any issues running or starting
@nightwing avatar
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2007 LX 150 (memories)
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UTC quote
Are you sure you have an evap system? I thought those were only US Vespas to comply with EPA regs.


https://www.gov.uk/emissions-testing
⚠️ Last edited by NightWing on UTC; edited 1 time
OP
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Hooked
carnaby 125
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carnaby 125
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UTC quote
Well in UK known as sas valve
@nightwing avatar
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2007 LX 150 (memories)
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UTC quote
Apparently, you are exempt from testing because you have two wheels. See above link I added.

If it runs OK, why not just leave it?
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BV250
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UTC quote
The correct answer is to maintain and replace vacuum lines as needed so that the evap system doesn't cause running problems.

For those willing to risk tipovers and fuel spills, the removal is great in order to eliminate the evap system as a source of vacuum leak and prevent fuel delivery issues due to overfilling or fuel getting into those tubes, causing improper flow of air in the tank. If any of these things are a problem and one wants to take their chances, that's when to do the evap mod.

I did mine. That should be telling One bonus was a rubber strap that I could repurpose as a battery hold down which I was missing.
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Hooked
carnaby 125
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carnaby 125
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UTC quote
I leave it as it is as so for I not got any issues at the minute
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Red Devil SH150i (10,000)
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@breaknwind avatar
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UTC quote
SAS is the secondary air supply. The Evap catches hydrocarbons that escape the fuel tank and returns it to the intake system. The SAS injects air into the exhaust system for a more complete burn of exhaust gases.
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Red Devil SH150i (10,000)
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UTC quote
ukguy2k wrote:
I leave it as it is as so for I not got any issues at the minute
The only time it's needs to be removed is when you use an aftermarket exhaust to stop deceleration popping.
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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The Hornet (GT200, aka Love Bug) and 'Dimples' - a GTS 300
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UTC quote
ukguy2k wrote:
Well in UK known as sas valve
A completely different system to the carbon canister Evap Crap the US has to endure. I'll add - it's not that crap on other vehicles, but it is on Vespas and some other motorcycles because of the fuel tank and fuel system topography.
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GTS 300ABS, Buddy 125, Buddy Kick 125
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@dooglas avatar
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NightWing wrote:
If it runs OK, why not just leave it?
^ ^ ^ Bingo! ^ ^ ^
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2016 BV350 White
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UTC quote
The evap crap takes up alot of space in my pet carrier. This would be a good reason to remove it, so I can use that space.
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@dooglas avatar
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UTC quote
bean counter wrote:
The evap crap takes up alot of space in my pet carrier. This would be a good reason to remove it, so I can use that space.
And that would have been the only reason I would have ever considered removing the evap system from my BV 350. It worked fine all the time I owned the bike. Given the position of the fuel tank in a BV 350, I'd guess it would be even more trouble free than the evap system on an MV.
⬆️    About 4 months elapsed    ⬇️
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UTC quote
FWIW, I completely fill up my BV350's gas tank every time I get gas and have never had an issue with fuel filling up the evap canister which is why I still haven't removed it, yet. If I did it would have been long gone. I think that this is more of an issue for the smaller vespas that don't have their gas tank so lower in their bikes.
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Dooglas wrote:
bean counter wrote:
The evap crap takes up alot of space in my pet carrier. This would be a good reason to remove it, so I can use that space.
And that would have been the only reason I would have ever considered removing the evap system from my BV 350. It worked fine all the time I owned the bike. Given the position of the fuel tank in a BV 350, I'd guess it would be even more trouble free than the evap system on an MV.
Unfortunately it isn't.

I endured popping on deceleration, throttle hesitation, erratic idle and stalling after startup on my '13 off and in for five years. I had it reprogrammed at the dealer when new software was available, I've changed the plug, cap, plug wire, etc. nothing mattered. Then about 3 weeks ago I finally removed the evap system. It's a different scooter now. All - and I mean every single one of those issues are now gone.

The evap system on the BV350 is an afterthought, and that's about how well it functions. Beyond that I am not a fan of evap systems that don't have a purge valve controlled by the computer. With a purge valve the computer decides when to cycle it based on current operating parameters, and is mapped for the introduction of extra fuel vapors during those conditions. The Piaggio system has no such control and relies on afterburn feedback to tell it what's happening. The result is a system that is constantly adjusting fuel trim to chase a moving target. That's way less than ideal.
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@dooglas avatar
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UTC quote
Bueller wrote:
I endured popping on deceleration, throttle hesitation, erratic idle and stalling after startup on my '13 off and in for five years. I had it reprogrammed at the dealer when new software was available, I've changed the plug, cap, plug wire, etc. nothing mattered. Then about 3 weeks ago I finally removed the evap system. It's a different scooter now. All - and I mean every single one of those issues are now gone.
If your evap system is malfunctioning, then certainly fix it or remove it as you choose. My comment was that the evap system on my '13 BV350 worked fine, as have the evap systems on the other 6 Vespa and Piaggio scooters I have owned. Yes, I understand there are evap systems that have failed. This Forum is also full of stories where an individual has a rough running scooter, others tell him to pull the evap system, he does, and it makes no difference. Best to fix the problem you actually have IMO.
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UTC quote
Dooglas wrote:
Bueller wrote:
I endured popping on deceleration, throttle hesitation, erratic idle and stalling after startup on my '13 off and in for five years. I had it reprogrammed at the dealer when new software was available, I've changed the plug, cap, plug wire, etc. nothing mattered. Then about 3 weeks ago I finally removed the evap system. It's a different scooter now. All - and I mean every single one of those issues are now gone.
If your evap system is malfunctioning, then certainly fix it or remove it as you choose. My comment was that the evap system on my '13 BV350 worked fine, as have the evap systems on the other 6 Vespa and Piaggio scooters I have owned. Yes, I understand there are evap systems that have failed. This Forum is also full of stories where an individual has a rough running scooter, others tell him to pull the evap system, he does, and it makes no difference. Best to fix the problem you actually have IMO.
Do you fill your tank to the brim?
Do you have hot weather that will cause excessive expansion of the fuel in the tank?
Those are two contributing factors.
Fill to the top all the time in hot weather and I would be amazed if the problem didn't happen.
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UTC quote
I removed the EVAP immediately after purchasing my BV's for space. I don't live in CA., so I didn't break any laws. But I did have stalling and popping on deceleration after EVAP removal on the 2014 that was solved by a remap.
@wleuthold avatar
UTC

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2006 Vespa GT (Rocket): 2005 Vespa GT (Razzo): 2007 Vespa GT (Vanessa): 2009 Yamaha Zuma 125: 2018 Yamaha Xmax (Big Ugly), 2023 Vespa GTS300 (Ghost)
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@wleuthold avatar
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UTC quote
My 2006 GT, Rocket, had one big issue within the first year.

In high speed runs, it would suddenly lose some power and slow from running in the 70's to the mid 60's. The engine temperature would go up as well and it would run poorly until I came to a stop, then headed out again. It would run normally until pushing the speed up again.

But some times it wouldn't do that. I ran the Cannonball in 2014, almost wide open for nine days without ever doing this.

Then, a few years ago it started giving me big problems.

Out on rides it would stumble badly, cut out and three times, stop running entirely. Two of those had me pushing it home, once one mile, the other almost three miles.

So I looked up a way to bypass the evap system, performed the simple procedure, and never had either problem again.

I did the same to Vanessa and Razzo too.

In an effort to get as much distance as possible out of each tankful of gasoline, I do fill the tank to full. Every now and then, fuel will drip put of the new bypass hose onto the ground when over filling. That fuel would have gone into the canister, wreaking havoc to the engine performance.

Bill
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UTC quote
Funny enough when I took my bike into the shop for a tune up (new plug, air filter, new belt, oil change) when I got her back she was also missing the evap can. Hey no complaints here

Looks like they did not plug the one nipple however and so I guess I do have a vacuum leak (or really, excess air in the intake stream I believe? will need to take another look) but it runs fantastic so I haven't been bothered to change it.

I *do* however get the deceleration popping - don't necessarily mind it. Unless it's harmful? I'm trying to understand what is going on in the engine to make it pop like that. Improperly timed combustion? Why only on decel?
⬆️    About 1 month elapsed    ⬇️
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2016 BV350 White
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UTC quote
I regularly fill my tank with gas to the brim and have hot Southern California summer weather and have had no problems whatsoever for over a year and a half. There's probably more to it than just filling to the brim and hot weather. My scooter has also never been tipped over. I wonder how many of the scooters with evap carp issues were tipped over at some point or had something else going on that upset the evap system. Personally, I would assume that there would be gas in the carbon filter part of the evap crap if I had tipped by scooter over and would replace the carbon filter or yank the whole system at the first sign of an issue.
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Veni, Vidi, Posti
2008 MP3 500, 2013 BV350, 2020 Vespa Sei Giorni, 2008 Vespa S150
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UTC quote
bean counter wrote:
I regularly fill my tank with gas to the brim and have hot Southern California summer weather and have had no problems whatsoever for over a year and a half. There's probably more to it than just filling to the brim and hot weather. My scooter has also never been tipped over. I wonder how many of the scooters with evap carp issues were tipped over at some point or had something else going on that upset the evap system. Personally, I would assume that there would be gas in the carbon filter part of the evap crap if I had tipped by scooter over and would replace the carbon filter or yank the whole system at the first sign of an issue.
It does have to do with over filling the tank, same thing happens with cars.
Now if you over fill and drive 15-20 miles before parking you won't have an issue. But if you over fill then park the car in the hot sun, you may have problems.
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