Post by scootdude on Jan 24, 2015 4:14:25 GMT -5
So I took my Grandvista 250 out for a ride today. I took it out on a short stint down highway 143 which runs by Sky Harbor in Phoenix. It's a 55 mph stretch of road, but most everyone runs 70 mph plus. I turned the throttle all the way and reached an indicated speed of 
mph!! It's a 250cc!! I know the speedo is probably overly optimistic by 5 or 6 mph, but even if that's the case this scooter with 12 inch wheels was doing over 80 mph!! I think that's downright amazing!! I know it was over 80mph because no one was passing me. I was leaving all the cars in the rear view mirrors. The lines on the highway were buzzing by fast.
It could be that because of the low altitude of only about 1100 ft. Phoenix AZ has almost the perfect 14 to 1 air pressure ratio for the optimal efficiency for a carburetor fed engine to produce the maximum amount of power. I kept my hand on the throttle and it was still accelerating. The 143 is just a short bit of highway, and I had to back off the throttle to merge back into 45mph speed limits on the city streets. The tachometer was reading a maximum of about 7,500 rpm. All I can say is that I was amazed. Not just at the speed, but how stable the bike was at that speed.
I have a 125cc scooter that tops out at 55mph with my 210lbs on it. Downhill I can get about 60mph of it but it's topped out. In fact, here in Phoenix with all the 45mph roads, I really don't need a throttle for the 125cc scooter. Just an on/off switch. I'm ether full throttle with it or I'm slowing down for a stop. It's kind of annoying really.
mph!! It's a 250cc!! I know the speedo is probably overly optimistic by 5 or 6 mph, but even if that's the case this scooter with 12 inch wheels was doing over 80 mph!! I think that's downright amazing!! I know it was over 80mph because no one was passing me. I was leaving all the cars in the rear view mirrors. The lines on the highway were buzzing by fast. It could be that because of the low altitude of only about 1100 ft. Phoenix AZ has almost the perfect 14 to 1 air pressure ratio for the optimal efficiency for a carburetor fed engine to produce the maximum amount of power. I kept my hand on the throttle and it was still accelerating. The 143 is just a short bit of highway, and I had to back off the throttle to merge back into 45mph speed limits on the city streets. The tachometer was reading a maximum of about 7,500 rpm. All I can say is that I was amazed. Not just at the speed, but how stable the bike was at that speed.
I have a 125cc scooter that tops out at 55mph with my 210lbs on it. Downhill I can get about 60mph of it but it's topped out. In fact, here in Phoenix with all the 45mph roads, I really don't need a throttle for the 125cc scooter. Just an on/off switch. I'm ether full throttle with it or I'm slowing down for a stop. It's kind of annoying really.
i did 73 mph on a Honda Elite and was passing semi-trailer trucks! 
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degrees summer weather, light winds, up and down hills, it tops out about 80 to 82 mph on the speedo, or 76 to 78 actual mph. Max cruise under most conditions is around 70 indicated, or 66 actual. And loading it with a passenger or lots of groceries doesn't seem to affect it much at all. Plenty of torque in these old rides!
