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I think you're really feeling the difference between different tires / tread / tire construction. Tires can behave very differently on different surfaces. I installed some Heidenau K61's on my Helix and my first ride on our grooved concrete pavement (very common around here) was frightening / butt clenching...the tires followed the grooves in the road as if they had a mind of their own. It was very disconcerting to feel the bars pulling slightly left and right while you're going down the road.

I soon got used to it and just went with it...super light grip on the bars, left the bike do its thing.

But, again, different tires give different feels. Out of balance tires will give you vibration and shaking at speed.

guy near me has a helix he is trying to sell.  i considered it but i thought parts would be hard to find and they are just old so the electronics concerns me.

So i bought new tires for my kymco 125 as it had 6k miles and the original tires were never good to begin with.  i got shinko sr723 tires off amazon 130/70-12 and 120/70-12.
I found a guy who said if i brought him the wheels off my scooter and the tires he would swap them out.  We talked about balancing them and he suggested beads the type you put in.  I didn't know about it but he said it was the best way to balance.  I got the tires back a couple days later and put them on.  He told me he had 3 ounces of beads and put 1.5 ounces in each tire.

With the new tires on i took them for a spin and they had too much air so i took the air in the front tire down from 32 to 28 there was 32 in the back.  There is a section of road with lines in it from the construction process near my house and when i hit those wavy lines (i drove on with the old tires) i could hardly control the scooter at all and i tried it a couple times since then and its very bad with the wavy lines where the stock tires had very little problem.  I have driven the scooter numerous times since then over a couple weeks.  It seems like where with the stock tires i could control the scooter at full speed maybe 50+mph now at high speed it feels unstable and like im floating around on the road.  At lower speeds under 45 and away from the wavy road it seems ok.

So do you think the tires need to break in, or is there an issue with the beads or maybe is it the tires themselves?  Any thoughts or suggestions?  I prefer not to go back to the guy because he beat my rims up when he changed the tires a bit and i like to avoid conflict.  If it is the beads is there a way to take them out without taking off the tires/wheels?

Thanks.

I did all this stuff on all kinds of different scooters.  Spree, elite, zuma, etc.

Then i bought a 125.  Price diff between the 50 and the 125 is about the same or less than people spend modifying their 50 to go faster.

My 125 went almost 60 mph earlier today and goes 45 up that steep hill into the wind.

No more 50s, im just getting a motorcycle license.

I have owned a lot of scooters and recently traded in my kymco compagno 50i for this new agility 125.

I have never owned a 125 cc scooter before and this one certainly has much more pep than my 50i.

It reminds me of some of my 50 cc 2 stroke scoots for power and the overall impression reminds me the most of my honda elite sr.

Build quality is not the best but good enough.  The motor is just awesome.  And the size and ride are quite good.

I think i paid 2100 bucks for this thing brand new and it comes with a 2 year warranty. 

I don't have a motorcycle endorsement but im taking practice written tests and studying the manouvers you have to do here in usa for the motorcycle driving test. 

If i could go back in time to my old self and give myself one piece of advice it would be to buy a 125 cc scooter even though it is just for in town use. 

Also i wish that you did not need a motorcycle license for a scooter less than 130 ccs and that they really did restrict scooters to say 45 mph not 30.  Just imagine how much safer in traffic all scooter riders would be if they could keep up with cars and climb hills.

Will do thx.

Thanks man for all the help.  Appreciate all the replies.  I did ask kymco to call me back and my service dept at dealer to figure out how to make it faster.  They never got back to me and wanted like 80 bucks for 10 minutes work.  Did it myself, learned, and plan on trying to do my own maintenance, except maybe let them do the brakes.

I would recommend this scooter to anyone who wants a moped legal scooter in kansas since the honda mets and ruckus are not restricted but tagged as motorcycle.

But for the money difference I think a used carb type kymco might be better fit for most-- i just wanted fuel injection so i would avoid screwing with carbs and for easy starts.

Total mods-- replaced variator drive boss face from restricted to smooth-- 7 bucks shipped, removed screw on throttle free, and replaced stock 7 gram rollers with 6 gram sliders-- 23 bucks shipped-- total cost to de-restrict 30 bucks-- well ok, 45 bucks for an electric impact and 17mm impact socket.-- 75 bucks.  Still cheaper than one service from dealer and now have my own tools.

Well I picked up an electric impact gun for 40 bucks so i wouldn't have to rely on my roommate.  Took off the variator and took out the old rollers which weighed 7 grams on my food scale and replaced them with 6 gram sliders.

Will have to wait until it is a bit warmer to find out how it worked.  Everything seemed fine running on the stand in the garage.

I think the 7 gram rollers was rev limiting me and hopefully I will see more revs with the 6 gram sliders.

Thanks, Zombie, sorry to derail the op post.