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I have exactly the same problem as Cortez, I also have DT300i. Did adding oil above the theoretically maximum level help? I noticed that this happens with the engine still not fully warmed up.

I never had the issue after that, I just added 0.1l more.

Might be a bit specific question but.. 

I just installed the J.Costa Evo3 in my XC500, and I've had the Polini clutch before.

It's currently set up to engage around 3500 revs which seemed great with the stock CVT
and weights as it improved the smoothness and mid-range acceleration (let's say 40 to 65mph)
greatly compared to the springs being set at it's lowest point which made it engage around 2500 revs.

However, now it seems like the bike needs waaaay too many revs to get going at small throttle openings
(I'm not aiming for maximum acceleration, I almost never launch with full throttle) and to get going in
traffic I'm around 4500-5000 revs, and if I feather the throttle just a tiny bit, I'm at over 6000 revs very
quickly which really isn't needed for normal traffic.

Should I roll the clutch springs back a bit, will that lower the revs a bit?
What I don't fully understand is.. if I'm at certain revs at let's say 50mph, will the clutch setup affect the revs
at those speeds or not?

Anyways, the j.costa is a great piece of kit.

I have 2013 xciting 500ri with the malossi cariator, malossi fly clutch and the malossi Kevlar belt.  Have about 9000 miles on it and still looks new,  no issues.


thanks

Well that's nice to hear.

I remember Vivo saying that Kevlar belts can do a lot of damage inside the CVT when they break.
I hear it over & over - belt sold by KYMCO is the way to go.

Stig

Working at the bike shop I "hear" a lot of things too.

I was looking for XC500 owner's first hand experience in here.
So.. anyone? 

Anyone got some mileage/longevity info to share regarding the Malossi Kevlar belt longevity?

I've never used anything but original Kymco belts (owned 3 different Kymco scoots and work at a kymco shop so..), but I got this
one as a spare from the previous owner so might as well use it. I've got around 4000 miles on it now.

Anyone made one snap?

Setup: Stock CVT, Polini clutch.

Cortez,
I have a XC500 (older carb version) and I am getting ready to replace the belt. I was wondering if I should be looking at replacing the rollers / sliders also at this time. Mine is OEM stock and except for cleaning by the shop during maintenance it has never been apart. The OEM belt has lasted very well for me but is it the best one to get? That goes for the clutch and rollers / sliders also.

My riding is mostly to and from work but I do a weekend ride of a couple hundred miles almost every weekend. This is on the highway so I need to be 70MPH at those times. I dont want to mess up the reliability of this scooter but I just want to do the next best thing.

Any help you can give me will be very appreciated.

Both belt and rollers as per service manual should be replaced after inspection if there's wear.
It's very likely that your rollers have flat spots and I'd replace them (with Dr Pulley sliders of course but, you'd get lower revs at those 70mph you tend to do).
OEM belts by Kymco are amazing re: quality and longevity, I'd stick with them (and I always have).

Look into 30-31g Dr Pulley sliders which will give you a better acceleration and lower revs at higher cruising speeds (haven't gotten them yet myself,
but I've had them in all other scoots I owned before). It transformed my DT300i which had a crappy stock CVT setup (the XC500s setup is IMHO pretty good).

The only piaggio master 500 scooter that I tried with Dr Pulleys was a friends Gilera Nexus
with the 8 roller setup (there's a 6 roller setup too). He was happy with the gain in acceleration
and smoothness off the line and at low speeds with -10% from stock, but he lost over 10mph from
his top speed and said he should have gone a bit lighter still.

The Pulleys ended up engaging the "overdrive" if you will a bit too soon so the bike couldn't rev out
to it's previous top speed.

Anyways, every CVT is different so it's a bit of a hit and miss.

I'd like to try the JCosta CVT but I can hardly even justify spending money on Dr Pulley sliders
at this point since the stock CVT setup is like I've said rather pleasant to use.

I've seen other brands (Malossi, Dr. Pulley) provide a few different colored spring sets so an owner can change how they engage also but I'm not sure with Polini. I know Malossi even offers spring tuning sets for some stock clutches. I've considered a Dr. Pulley HiT clutch for the MyRoad but I think I will start with sliders first.

This thing is adjustable out of the box between 4800 and somewhere over 6000 I believe.
We'll see.

I've had sliders in all my scooters and even with malossi cvt I've used the sliders - 10/10 experience every time.