Emissions control in our scooters

IceHouse · Post by **IceHouse** » Mon Jun 16, 2008 8:26 pm

I'm interested in finding out how our scooters control their emissions to meet EPA standards. The Yamaha website says that the Zuma does it with both its carb setting (I'm assuming they just set it a little on the lean side, can't imagine there is any computer control or anything) and with a catalytic convertor. Anyone know if Rattlers/Roughhouses have catalytic convertors, or is it all in the carb setting, or something else?

Lots of googling failed to bring up any decipherable info, hoping someone here knows a bit more.

Hugo · Post by **Hugo** » Mon Jun 16, 2008 8:36 pm

I believe that the rattler also uses a cataletic converer. There is a slim pipe that runs off of the exhaust which is directed straight back into the engine--I think the variator housing.
It's the same exact setup that my Typhoon has, which is supposedly converted to satisfy the EPA

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vespatech · Post by **vespatech** » Tue Jun 17, 2008 5:20 pm

its actually a one way valve that takes air from the belthousing into the exhaust to help burn off any extra fuel in the expansion chamber

Hugo · Post by **Hugo** » Tue Jun 17, 2008 8:29 pm

vespatech wrote:its actually a one way valve that takes air from the belthousing into the exhaust to help burn off any extra fuel in the expansion chamber

Ahh... makes sense.

IceHouse · Post by **IceHouse** » Tue Jun 17, 2008 9:41 pm

Huh...that's interesting.

Hugo, no more Ouroboros? (I'm guessing that's what your last user pic was) From the look of that cat, I would guess the photographer didn't take any pictures for awhile after that one!

Hugo · Post by **Hugo** » Wed Jun 18, 2008 6:12 am

IceHouse wrote:Huh...that's interesting.

Hugo, no more Ouroboros? (I'm guessing that's what your last user pic was) From the look of that cat, I would guess the photographer didn't take any pictures for awhile after that one!

That's my cat (Hector). Believe it or not, he is just chillin' in that picture. He likes to sleep on his back with his mouth opened. I find the picture hilarious, because he looks like "Satan's kitty"

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Evans Performance · Post by **Evans Performance** » Wed Jun 18, 2008 2:14 pm

vespatech wrote:its actually a one way valve that takes air from the belthousing into the exhaust to help burn off any extra fuel in the expansion chamber

i have heard of people talking about an egr system. is this what they are talking about?

i have heard of getting a couple MPH's of top speed by blocking that off

nissanman · Post by **nissanman** » Thu Jun 19, 2008 2:00 am

Yup, exhaust gas recirculation system...

vespatech · Post by **vespatech** » Thu Jun 19, 2008 2:41 am

its not egr on the rattler 110 i traced it back to the belt housing it just takes clean air out of the transmission and puts it into the exhaust. open or blocked makes no difference although blocking an actual egr will slightly help performance thats not the case here

Evans Performance · Post by **Evans Performance** » Thu Jun 19, 2008 2:02 pm

thats what it looked like to me. i finally took a good look in that area today. if thats not egr, then is there any sort of egr that can be eliminated on the rattler?

vespatech · Post by **vespatech** » Sat Jun 21, 2008 12:18 am

not that i know of havent found any more of those pesky epa/factory mods

barndwellers_md · Post by **barndwellers_md** » Sat Jun 28, 2008 3:02 am

I've opened up a couple of mufflers on 2007 scooters (Rattler included) and they contain honeycomb type material inside that gets cherry red to further burn exhaust gases during normal engine operation. My guess is that these mufflers are a combo muffler/catalytic converter.

Aftermarket performance mufflers do not contain the honeycomb part.

vespatech · Post by **vespatech** » Sun Jun 29, 2008 3:50 pm

all imported 2 strokes are catalyzed these days unless its an off road use vehicle but some of those are too