GY6 and emmisions By imnts2 (Read 1,168 times)

[imnts2]

I was away from small engines for so long I am not sure I Have a good handle on how emmissions had changed how they run. It does seem to me, that my old Honda 90 (1966?) ran a lot different than my GY6 150. Reminds me of the difference between a 1967 XKE and a late 1968. Or a 66 Ford 460(7.3) and a 70.

Even my late 40's Salsbury ran differently too.

Have we got some people who know a bit the history of emmisions and performance in scoots and other small motors?
Thanks

[bcgreatness]

on the newer scoot motors there is an emissions recycler that was not on the older ones that is mistaken for an egr. what it does is takes air and injects it into the cylinder head to the exhaust ports so that way it helps to burn the unburnt fuel that way the exhaust is cleaner, most scoots are also equipped with pumps that filter the air going back into the exhaust so that it does not damage anything. you may have already notices a wierd petcock looking pump that seems to be hooked up to your valve cover/exhaust. thats what that is. the older model scooters do NOT have any of these things. as far as the performance goes, only thing it can do is make your scooter run hotter because of the extra air in the exhaust, and it makes it more of a pain to adjust the carb to compensate for that difference. if somebodys scoot is running too rich or flooding out its always a good thing to check these parts of a scoot because if they malfunction, your scooter WILL NOT run proper at all. hope i answered your question.

[sprocket]

It is a PAIR system or Vapor Recovery System (VRS)

See Here: www.chinesescooterreference.com/manuals_charts.htm

Most scooters are tuned VERY lean from the factory and they should be enriched with the air/fuel screw...

The GY6 engines are pretty dirty compared with newer designed Honda EFI motorcycle engines etc...

Most people remove the emission stuff...it is problematic.

[imnts2]

You both have been helpful. Thanks. Still got more to learn. I am guessing something also was done to the ignition. Yes or NO?

Yes I agree about removal. I wonder if the California people have to undergo anual emission tests or inspections?

Again thanks.
Lloyd