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I have a vibration that starts at about 63 mph, continues to about 68 mph and stops at higher speeds. Have completely replaced and rebalanced the tires. Have checked for missing weight on the drive shaft. Dealer has no clue. The vibration is more audio than physical .
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Most 125cc scooters are restricted to between 60 and 70 mph often because of certain laws in each country they are sold in. These 'Twist and Go' automatics alway sound like they want to go faster but the transmission needs to rev that high to work properly.
It is possible to de-restrict your scooter but the top speed you would get would not be a lot higher, maybe 10 to 15 mph more.
Scooters also use much smaller wheels compared to a motorbike which makes the scooter less stable at higher speeds. Mine starts to shake and vibrate when it hits it's top speed of 70mph. To get much higher speeds you would need to spend a lot of money changing gearing ratios roller weights or even swapping complete transmissions. One option if you want to keep at the 125cc size is to change to a bike with a manual transmission like the bigger motorbikes. Some of these bikes can get closer to 100mph but most 125cc bikes and scooters all tend to max out at 70mph. At higher speeds the manuals don't sound like they are working as hard as a scooter does.
Sounds like a high speed balance issue. You might take it to a tire shop and ask for a high speed balance. It also could be tie rod ends starting to wear and you are hitting a speed where they want vibrate.
There are many stages of vibration. The most common is in the steering and USUALLY a steering dampner will correct this. However, your description is not real defined and until the technician actually experiences it, it cannot be properly diagnosed
Are the new springs that were fitted original factory or after market?
New springs will be less flexible than old ones until they settle into use. This will explain the increase in ride height. Old springs soften so the ride height drops a small amount. At higher speeds your getting more down force so the suspension will settle.
Remember she's a 20 year old truck, things start to sag as you get older.
rear tires
When I drive 30 mph and above the back tires vibrate... why?
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