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qwertydude · 03-10-2010, 01:48 AM

I've got a fair bit of tuning experience with scooters. And generally your big name brand modern scooters will be rev limited. They often have soft rev limiters that basically cut every third spark to lower power output at redline. And yes often times there is a cvt limiter but that will only limit where you run out of gearing so that at top speed your revs are sky high and trip the rev limiter. Remove those then you get a wider range of gearing and more fuel efficiency. The next step would be to get a new no unlimited CDI or reprogram your ecu if it's a fancy new FI scooter.

As for roller weight unless your too light on the weights, on flat land with no wind, you'll have the same top speed whether you use heavy or light weights. The weights only affect your acceleration and hill climbing ability by keeping the engine in it's powerband for as long as possible. Ideally you want lighter weight rollers so that your rpm stays at the peak power rpm until you hit your drag limited top speed. If the rpms stay sort of low then start climbing after a certain speed then you're too heavy. This really only applies to 50cc scooters. That honda gyro cvt falls into the 50cc tuning category so look for any restricting washers in the cvt and if you want replace it with a high performance cvt with a wider gearing range.

But since this is an ecomodding forum in certain cases you may want your rpms to stay low. If you've got a larger displacement scooter say a 150cc or so and you want maximum fuel effeciency then what you want is heavier weights that keep the rpm low til about 40-45 mph then climb from there, that way putting around gets maximum mpg and as the revs climb to faster speeds you get gradually increasing power without wasted rpm.

03-10-2010, 01:48 AM	#4 (permalink)
qwertydude EcoModding Lurker Join Date: Mar 2010 Location: Norwalk, CA not CT Posts: 10 Thanks: 0 Thanked 0 Times in 0 Posts	I've got a fair bit of tuning experience with scooters. And generally your big name brand modern scooters will be rev limited. They often have soft rev limiters that basically cut every third spark to lower power output at redline. And yes often times there is a cvt limiter but that will only limit where you run out of gearing so that at top speed your revs are sky high and trip the rev limiter. Remove those then you get a wider range of gearing and more fuel efficiency. The next step would be to get a new no unlimited CDI or reprogram your ecu if it's a fancy new FI scooter. As for roller weight unless your too light on the weights, on flat land with no wind, you'll have the same top speed whether you use heavy or light weights. The weights only affect your acceleration and hill climbing ability by keeping the engine in it's powerband for as long as possible. Ideally you want lighter weight rollers so that your rpm stays at the peak power rpm until you hit your drag limited top speed. If the rpms stay sort of low then start climbing after a certain speed then you're too heavy. This really only applies to 50cc scooters. That honda gyro cvt falls into the 50cc tuning category so look for any restricting washers in the cvt and if you want replace it with a high performance cvt with a wider gearing range. But since this is an ecomodding forum in certain cases you may want your rpms to stay low. If you've got a larger displacement scooter say a 150cc or so and you want maximum fuel effeciency then what you want is heavier weights that keep the rpm low til about 40-45 mph then climb from there, that way putting around gets maximum mpg and as the revs climb to faster speeds you get gradually increasing power without wasted rpm.