Hi there, been riding bike over 25yrs this is my first scooter, should have got one years ago !! But i need help!! its got very bad vibration over 45 mph though seat, handlebars, pulls up to 75mph okay, but just fills unsafe but as i said its my first scooter, its done 24k miles its a 1999 an400 i know its not new but is this normal plaese help. thanks dave

Check the usual..
F and R tyre pressures etc, maybe slackening and re-tightening the front wheel axle and any pinch bolts etc.
Is the suspension adjustable - maybe a notch up or down at the back
Proper Burger owner will be along soon to help...

Hello & Welcome.

Check the tread blocks on both tyres for uneven wear across the pattern, particularly look for "feathering" from front to back

hello and welcome lad as above

Hi there, thanks for the replys, all tyre pressures good, slight play at rear wheel !! might be it, vibrating at 50mph, someone said have a look at rollers and belt but would it vibrate at higher speed ? regards dave

dave7 wrote:1999 an400 i know its not new but is this normal

I had the same scooter and it's very definitely not normal!

As Bern said check tyres for uneven wear, also check pressures and for play in wheel & steering head bearings (I see you've found some in the rear one?). Have a look at the tyres themselves - any bulges etc.? Make sure the wheels are true & that there's no signs of missing balance weights (square glue/tape marks on rim).

Very much doubt it's the suspension settings, I once rode one of these that had a completely shagged rear shock and it didn't vibrate at all. I also doubt that it's the belt, but it's easy enough to whip the belt case off and have a look. That's worth doing anyway if you don't know the history of the scooter.

just thought as well,. engine mountings bolts are secure, try tightening them got to be laid down for this job

if all else fails gets lots of lub sell it as vibrator