Cricket wrote:
At what elevation will you be riding? I had trouble with my GT slowing down to 35 mph at high altitudes (something to do with the lack of fuel-injection - the gearheads can explain). My GTS also had issues at 7,000' but not as drastic.
I live at about 5,300 ft above sea level. While I don't know the specifics of the fuel injection system in the GTS, I do know that most, if not all modern fuel injection systems measure or compute the amount of intake air and simultaneously monitor the amount of oxygen in the exhaust stream. With these measurements and some others (e.g., throttle position - again, I have no idea how sophisticated the GTS system is), the engine management computer dynamically determines the correct amount of fuel to inject. As a result, a fuel injected system automatically compensates for changes pressure and temperature so the air/fuel mixture is always correct.
Unlike the fuel injected engine in the GTS, a carbureted engine such as the one in the GT200 in unable to adjust to changes in temperature and pressure. As a result, carbureted engines sometimes need to be rejetted to add less fuel at altitude.
While I do not know the specifics of the GT and GTS, this is my general understanding of carburetion versus fuel injection.
So, in your case, the GT probably became overly rich as you went up in altitude, which caused the engine to lose power. The GTS compensated for the changes in atmospheric conditions dynamically and added less fuel as your altitude increased, maintaining a proper air/fuel ratio.
I should note that both scoots will lose power at altitude, due to the lower density of the air. The GTS just isn't affected as much as the GT because it's able to maintain a proper air/fuel ratio.
Anyway, I didn't mean to carry on there. Given that I live in Colorado and I am purchasing a carbureted scooter, I've been thinking about this issue. While it will never be as good as the GTS, I figure that I can do reasonably well with a properly jetted GT200, especially since I don't often ride in the mountains.
Given the choice, of course, I'd opt for the fuel injected engine.
-Dave