Modern Vespa

Joe Bulvas recent trip through the Alps ( with no Check engine lights coming on at altitude) got me to thinking why we have this issue and he doesn't?
The obvious known difference in Europe and the States is the Evaporative canister, so I now suspect that a bit more than I did before.
I have to say however, it makes no sense to me that it should effect much, but guess I might disconnect it anyway just to see.
Does anyone know of any other changes between the models provided to U.S. customers and the rest of the world? My guess is nothing of importance. Maybe turn signals or something. But nothing that would affect running quality. Could be wrong!
Also, anyone see a logical reason this canister should really effect performance? I know many have disabled theirs and thought it was an improvement--but why would that actually be true?
I am not asking for testimonials here, but purely rational reasons why it should improve anything to actually do away with it.
I don't mind disarming it if it makes any sense, but would leave it alone otherwise.

Those are some good questions and responses will be helpful. I have been wondering the same thing about the evap can and have yet to disconnect mine. Mostly I have been inclined to wait until warranty expiration lest there be some reason for warranty denial should something else occur, but if it were really going to make a positive difference I would do it now. The intermittent stalling problem I had earlier seems to have, um, evaporated (maybe cooler weather) and so I feel less like I should remove the evap can for that reason.

I recently investigated the removal of the canister. I took the cover off. One reason to remove regardless of mechanical need is the extra space you will reclaim. I want to find a good way of plugging the canister hose holes in the pet carrier. One way is to use an electrical 3/4" water tight knock out seal. I don't want the hoses to remain in the pet carrier.

When the canister is working correctly, it does no harm, but it can cause problems when it malfunctions. Thus in some cases removing it can seem like a "performance upgrade."

And picking up a few square inches of storage space doesn't hurt!

Roughly 68 cubic inches.

I pulled the hoses through and plugged/filtered them. Didn't cut any (so I can go back to factory) and zip tied them to other hoses or wiring harness. I used vacuum line parts from auto supply. Clearing Out the Pet Carrier (Post 674212)

[quote="Bohemian"] Your post is what made me act on it. Can you post a pic. of the finished product?

Mike

ah, i thought i was the only one with the check engine light issue...

i notice it most at about 7000 feet and going over 70 mph...if i slow down below 5000 rpms the light goes off...on my trips from albuquerque to phoenix it will come on about 5 or 6 times...gah, i hate that...

anybody find a cure??

g

Gelding, I had a long thread going on it, but the bottom line is no. No cure so far, which is why I am asking here about the Evap canister. We find here that backing off the throttle and gunning it will make the light go off--for a moment. Then its back on again of course. I hardly bother these days.
Keep in mind that my wife's 250 GTS super has a similar system and has no light coming on at altitude.
The problem is: what if the light went on for another, perhaps critical reason?
We are somewhat self-trained to ignore the light at this point--not a good solution.
If I ever get it figured out I will post about it.