|
|
Post by scooterwells on May 3, 2018 21:05:22 GMT -5
Hi guys! I'm a scooter newbie and purchased my first scooter, a 2005 Honda Metropolitan, a couple months ago. It was inspected, tuned up and fixed up prior to my purchase and seemed to run fine at that point. Yesterday I was accelerating and after smoothly reaching approximately 17mph it started to "chug" for lack of a better word. It made it to approx 21mph but no faster, and I was worried it was going to die the whole time. What do you think might be wrong? It'd be a pain in my a$$ to try to get it to a mechanic in this condition so I'm hoping it's something I can check out/fix first? Any suggestions?
|
|
|
|
Post by GrumpyUnk on May 4, 2018 10:30:11 GMT -5
First thing I would check would be to assure that there was fuel in the float bowl on the botom of the carburetor (and the fuel tank). I would look at the fuel flow from the filter to the carb, opening the vacuum petcock by sucking on the diaphragm line. Fuel should flow, full fuel line diameter, no dribbling or drooling, a good clean flow. If not, check the filter and the fuel outlet in the tank. Most have a 'standpipe' inside to grab large chunks of 'whatever', which can plug up over time.
If it seems temperature related(how hot is the engine), it could be valve clearance adjustment is needed. Valve clearance shrinks as the engine parts heat, and could possibly cause loss of compression, and thus loss of power and poor running.
Most times a spark, coil, CDI or pickup will get dysfunctional like throwing a switch(they are electrical), and will not cause the bunny hop... They'll die and you will coast to a stop. And possibly revive after they cool down if they had an internal break in a coil that opened when hot, and closed back up as it cooled.
Anyway, check fuel flow first.
tom
|
|
|
|
Post by scooterwells on May 4, 2018 11:17:04 GMT -5
"First thing I would check would be to assure that there was fuel in the float bowl on the botom of the carburetor (and the fuel tank). I would look at the fuel flow from the filter to the carb, opening the vacuum petcock by sucking on the diaphragm line. Fuel should flow, full fuel line diameter, no dribbling or drooling, a good clean flow. If not, check the filter and the fuel outlet in the tank. Most have a 'standpipe' inside to grab large chunks of 'whatever', which can plug up over time."I know there's clean fuel, about half a tank. So if I open her up I should see fuel present "in the float bowl and bottom of the carburetor"? How do you suck on the diaphragm line....? I don't have a garage, I park in a parking lot and have virtually no tools, is this going to be over my head? |
|
|
|
Post by jbjhillbilly on May 4, 2018 12:23:42 GMT -5
"
I know there's clean fuel, about half a tank. So if I open her up I should see fuel present "in the float bowl and bottom of the carburetor"? How do you suck on the diaphragm line....? I don't have a garage, I park in a parking lot and have virtually no tools, is this going to be over my head? Not over your head. It’s fairly easy to learn, just don’t panic. Remember - nobody came out of their mama knowing this stuff. You’ll need a 10mm socket to take the under seat bucket out, then a flat blade screwdriver to open a small valve near the bottom of the carb to empty the float bowl. Here’s a good video that shows how to take the seat off, and the general carb area youtu.be/1wI4CnZhuksAnd here’s a pic of the carb  |
|
|
|
Post by Happypancake! on May 4, 2018 16:20:39 GMT -5
Carb slow jet or fuel filter is most likely plugged
|
|
|
|
Post by GrumpyUnk on May 5, 2018 9:32:15 GMT -5
I am not familiar with carburetors installed on Honda products, so can only point out to someone who has a China machine that the float bowl drain will most likely be on the 'left' side of the float bowl. The image shown has the drain on the right-rear, more or less. That location looks better for access than the China versions.
If the tank outlet or fuel filte were plugged, the flow from the fuel line would be limited, which is the reason for the comment about 'full flow' from the fuel line.
The China machines, a lot, have a vacuum operated petcock that stops fuel flow to the carburetor float bowl when the engine is not running. The petcock depends on intake manifold vacuum to pull open the internal valve and allow fuel flow. Without vacuum, a spring closes the valve. To make it flow w/o the engine running, you have to apply vacuum to the diaphragm. You can disconnect the rubber vacuum line on the intake tube and suck on it to enable fuel flow. Honda may have a different setup. I do not know.
tom
|
|
