So I'm at a bit of a loss about what the problem could be
A friend of mine has a suzuki s40, 2008 i believe
The bike starts and idles fine but when accelerating it sputters and won't
accelerate beyond 15 miles an hour
We've cleaned the carbs with the exception of the accelerator pump? or maybe it's a decelerator pump, it's got 3 stuck philips head screws holding it in
I didn't have my impact driver on me at the time so that will have to be cleaned within the next few days
all ports and jets have been cleaned
The petcock has been tested, somewhat, the fuel will run from the line when it is in the prime position, it will also run in the on position and reserve (checked by disconnecting the vacuum line from the petcock while idling and it died)
we also pulled the petcock off and verified there wasn't anything blocking it, clean as could be
Nothing is blocking any air ports including the one in the front of the carb, the port that lets air into the upper diaphragm, I know sometimes aftermarket air filter housings can block them
The bowl float moves freely as well as the needle that the floats actuate
The upper diaphragm area has been cleaned and i cannot see any holes or anything in the upper diaphragm
We also checked the spark plug and verified it worked as well as the wire
I also checked the voltage at the battery thinking maybe it could be a charging issue with the battery voltage dropping but that checks out too
I disconnected the decompression cable thinking maybe the valve was stuck open, nada
double checked all the lines from the carbs and tank
the tank vent line is clear
the the vacuum line from the carb to the petcock is working and is pulling fuel into the carb
I verified the fuel flow by opening the carb drain bolt, gas came out so I know that is working
i also tried to run it with the gas cap off in case there was a vacuum issue with it, nothing
I'm not sure what else it could be, it was running fine until it was parked for a few weeks, had a little rain that probably got under the bike cover but it wasn't like soaked
I assume if the rain did something to the wires then there would be a blown fuse or something
I also pulled the exhaust to check the gasket, that was good as well
Could this accelerator pump be related to the issue?
Or is the piece on the side of the carb a decelerator pump?
To me it feels like the carb slide isn't reacting the way it should, almost as if it had a hole in it but i can't see one