Dan Forsh
Addicted to ArboristSite
Apologies in advance, I know this is off the topic somewhat, but I know you guys will have the answers for me.
My 13 Yr old turned up with one of these mini motos he'd bought off his friend. Doesn't work and they'd had a go at fixing it, so arrived with me in a mess, screws missing, seals missing and limited info as to its problems.
I've checked over the bits I'm familiar with; compression, spark, etc.. but this float carb is new to me. I'm used to diaphragm carbs but could do with a few pointers on how these things work. I've taken it apart and think I know how it works, seems pretty simple, but am I on the right track?
The way I see it (and please correct me as we go)the fuel is gravity fed from the tank and the float controls the fuel influx of fuel into the bowl, when the throttle is turned the cable lifts a needle out of the 'jet' and allows fuel into the port?? From there I assume that crankcase pressures do the rest?? There is a small screw with a fibre washer on the bottom of the bowl, that doesn't provide any kind of fixing, so is this some kind of air inlet? Also there is a small tube coming off a nipple that I don't know about, but seems to just vent to atmosphere. What's this for?
Only one adjustment screw which seems to ride against the side of the throttle needle, so I assume this is the idle adjustment. Are these things this simple?
Thanks in advance,
Dan
My 13 Yr old turned up with one of these mini motos he'd bought off his friend. Doesn't work and they'd had a go at fixing it, so arrived with me in a mess, screws missing, seals missing and limited info as to its problems.
I've checked over the bits I'm familiar with; compression, spark, etc.. but this float carb is new to me. I'm used to diaphragm carbs but could do with a few pointers on how these things work. I've taken it apart and think I know how it works, seems pretty simple, but am I on the right track?
The way I see it (and please correct me as we go)the fuel is gravity fed from the tank and the float controls the fuel influx of fuel into the bowl, when the throttle is turned the cable lifts a needle out of the 'jet' and allows fuel into the port?? From there I assume that crankcase pressures do the rest?? There is a small screw with a fibre washer on the bottom of the bowl, that doesn't provide any kind of fixing, so is this some kind of air inlet? Also there is a small tube coming off a nipple that I don't know about, but seems to just vent to atmosphere. What's this for?
Only one adjustment screw which seems to ride against the side of the throttle needle, so I assume this is the idle adjustment. Are these things this simple?
Thanks in advance,
Dan