Max rpm for the 250

[Golota]

Hi,


I have recently bought a 2005 Kmyco Xciting 250. This bike is supposed to be have max torque at 7500 rpm. However, my bike will not go above 6500 rpm abd my top speed is around 100 km/h. Just took my bike for maintenence and the mechanic said that the variator is factory standard. I don't know about any restrictor in this bike. My question is: is there something wrong with mine, or this bike is not supposed to go above 6500 rpm at all....

Other than this little puzzle, I really like this scooter. It is comfortable, relatively agile for its size and the suspension is pretty good too. It has just about everything that I was looking fo in a scooter and for touring I have a "proper" motorbike. However, if there is more potential in this scoot, I would like to unleash it.... 

Thanks!

[Urbestfriend]

Urbestfriend is not sure where you're located.  But I recall 100 km/hr. is close to
55 mph.   Not sure where this restrictor comes from,  but several have mentioned it.
Depending on the way the wind blows,  I can easily hit 70 mph.  However the RPM
really gets into the red,  usually somewhere around 8,000.  Like I say,  if the wind
is behind you it's lower.   If you are not in the US,  you'll have to double-check
if there is a possible restriction of some sort.

I have many miles in the Red with no resulting issues at 5,500 miles.

[TechGuy]

I don't know the revs on my P250 but it easily reaches an 80-85 indicated speed.

They do not speed restrict the X250.  I wonder if the CDI was replaced with the incorrect one?

[Golota]

Thanks for the answers. Actually, 65 MPH is 104 km/h which is the speed I can reach. I'm not really worried about top speed, as I tour on my Triumph Tiger 1050 and only use the Kymco for commuting in town. However, the rpm limit is bothering me, as the bike's peak torque is supposed to be in the range that my bike can not reach. I will check the CDI.

[axy]

Your scoot has 1-2 hp less than my P250S with the same displacement, but it should still see 140+ km/h indicated, or around 130 km/h according to GPS, fully loaded on flat surface.
104 km/h is good, but for 125 CC/10 hp, not the scoot with twice the power and displacement.
Have that thing checked thoroughly.

I would avoid that mechanic who obviously did not find anything wrong with 250 cc 19 hp scoot doing 104 km/h.

[TechGuy]

If your rollers are worn (or too light, IIRC) or your belt is stretched, you will have problems attaining maximum speed.

[axy]

If your rollers are worn (or too light, IIRC) or your belt is stretched, you will have problems attaining maximum speed.

Regarding the belt, I wonder how stretched it should be to have 40 km/h lower indicated top speed than expected.
However, it is possible that somebody has installed wrong belt or rollers or...

[Golota]

Thanks for the help guys. I checked the CDI. It is the originial device and was not tempered with.

Could this be a carburetor issue?

I'm beginning to wonder if the mechanic (a Kymco dealer by the way...) was all wrong about the rollers and the belt. He said they were standard parts, but I'm just not sure about that any more. If the carburetor is fine, I might go for new rollers, since they are inexpensive and I don't want to spend a fortune on troubleshooting.

[axy]

Thanks for the help guys. I checked the CDI. It is the originial device and was not tempered with.

Could this be a carburetor issue?

I'm beginning to wonder if the mechanic (a Kymco dealer by the way...) was all wrong about the rollers and the belt. He said they were standard parts, but I'm just not sure about that any more. If the carburetor is fine, I might go for new rollers, since they are inexpensive and I don't want to spend a fortune on troubleshooting.

If it runs fine all the way up to its top speed of 100-105 km/h, I seriously doubt the problem is with the carburetor.

[Golota]

Actually, the rpm quickly reaches 5000. The scooter accelerates fine up to about 80 km/h. Then it takes a while to reach rpm 6500  - 100 km/h.

[Hoolander2]

If the rollers are worn and therefore lighter, I would think the motor should still reach redline and higher.  You just wouldn't get as high a top speed. 

If someone installed much heaver than stock rollers, I could see that impacting revs and power.  Ditto if the belt were worn VERY thin.  Seems that's all been looked at already, though. 

You don't perhaps have a much larger than stock rear tire, do you? 

Or hey, the most simple thing would be your brakes are dragging? 

[Golota]

Hoolander,


My rear tyre is stock. Brakes seem fine, as I have no problem pushing the bike to the garage. I will check them again though.

Someone mentioned similar issues with a People 250. He had a carb seal problem. I'm wondering if my bike has something similar.

[Golota]

I will take it to a different mechanic though. I asked the dealer to look at the missing bolts on the fairing and put in new ones. They failed to do so. They did not even know what the standard roller weight should be, I had to look it up myself, so I'm not holding my breath about their "expertise".

[axy]

Check the belt specs: width and length.

[TechGuy]

The big question I have is you comment about standard parts.  Standard "generic" parts, Standard non-moto Gates belt or "Standard" Kymco OEM part?

I just looked and the X250 and my P250 have the same belt and rollers.

Below is a jpg of service guides data to see if the parts are correct.

This is what my new belt looked like