KymcoForum.com
Scooters - 125 to 300 => People 250 => Topic started by: HEKSIO on May 18, 2016, 09:57:28 AM
-
Hi guys!
I wanted to change the membrane because the little hole...
I bought part:
"New Genuine PGO Vacuum Piston Comp 1402-939-2100"
Now scooter accelerates as 125cm and the maximum speed is 85km / h :-(
Part is similar but not the same - see photo.
(http://s1.tufotki.pl/2016/05/18/nvDeX-yNf51S.JPG?v=2)
t is bigger
and the rubber is harder than original one.
In next step I bought oryginal Kymco part: 1402-939-2100.
It is exactly the same as the PGO !
Carburetor - its Keihin CVK 30
and... I know nothing..
anybody can help me? Please... :-(
-
I am of no help, bet and win if he is around could probably give you advice.
-
Old threads with no resolution !
I have same engine and we cleaned out the carb before test running.
Acceleration and speed were low, for a 250 so we looked and noted the slide would not lift, when opening the throttle.
Tracing the path, we discovered, and removed, a rather stiff coil spring which held the diaphragm activated vacuum port.
This is behind a 3 screw cover on the side of the carb. There are other parts that will fall out when the cover is removed, including the diaphragm, a check ball, and an O-ring.
Acceleration and speed doubled, yet we've lost smooth idle, which will probably require adjustment.
I may check the hardware store for a lighter spring... it's about 3x diameter of a ballpoint pen spring and the same length, yet exerts quite a bit of pressure when compressed within it's shallow housing by the cover. We can not imagine the level of vacuum overcoming that spring to open the valve, and in turn raise the slide for more power.
Here on the left coast the State regulators frequently require companies to install 'limiters' on many small engines and we suspect the stiffness of that spring has something to do with that sort of sculduggery.
I will post final resolution to the problem, as we see it, when certain.
redk
-
Are there any resident CV carb experts here ?
I have always found it wiser to seek advice in advance before tearing things down.
Well, perhaps not always...
(I am a learning microprocessor.)
Maybe.
redk
-
Yes, I became a carb expert cleaning the CVK30 on my 2005 Kymco GV250. I have an extra OEM carb which went bad - I got it from jbird. The vacuum slide / diaphragm is in perfect condition.
Here's my carb videos for the Kymco 250:
Carburetor Cleaning Part I http://youtu.be/w4vW4zh8g0Q (http://youtu.be/w4vW4zh8g0Q)
Carburetor Cleaning Part II http://youtu.be/ig0qHhdxJFE (http://youtu.be/ig0qHhdxJFE)
Carburetor Cleaning Part III http://youtu.be/EjCmiZ5xoeU (http://youtu.be/EjCmiZ5xoeU)
Kymco Carburetor Remove & Reinstall http://youtu.be/uE3d9QI2m2Y (http://youtu.be/uE3d9QI2m2Y)