Scooter fuel consumption

[tommivercetti]

How long should a full tank of fuel last on a 50cc scooter (Aprilia sonic GP), I filled it up on sunday and i'm on low on tuesday, I only drove to mates house about 10-15 miles away, then work monday, tuesday and i'm low. Could it be a carb problem or is the technigas exhaust drinking more fuel. My mates 100cc peugeot lasted all week on 4-5 quid.

Any suggestions?

[Vespa]

.

[verbalremedy]

Anyone know how far you can get on a full tank with an nsr125 ? + how much to fill it lol as you can tell I dont have my bike yet.

[TheShaggyDA]

Time to change your avatar, Badbo1

[camcam]

[simon1221]

You should really be getting at least 50mpg.

Check for fuel leaks? Peer into the fuel tank after leaving it overnight and see if its drained out.

Another theory could be that your vacuum tap is faulty, letting fuel out of the tank for no apparent reason.
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DNA50 (sorry) ->> TZR125l >> GPZ500S

[tommivercetti]

[Krs]

£1 last's 15 miles read that in t.w.o

[tommivercetti]

[tommivercetti]

Where is vacuum tap on the bike? Is it the metal thing in which a tube comes from tank and two go to the carb?

Where can i get a new vacuum tap?

[simon1221]

Well it has to go somewhere... try and find it

I dont know on scooters i never had one, usually at the bottom of the tank, but i cannot be more specific as i dont know anything about scooter tanks.

Lets hope someone with knowledge of your bike knows, details will help.

Someone like binge or the other kid in the know.
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DNA50 (sorry) ->> TZR125l >> GPZ500S

[tommivercetti]

Could it be that the bikes warm when i fill up and cold in morning?

I can't seem to find a leak but could it be evaporating?

[Scooby]

Has it got a manual choke?
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A big enough hammer fixes anything!

[tommivercetti]

It has a manual choke yes why

[simon1221]

No.


Lets see if i can explain it properly,

The vacuum tap works by the engine turning over and sucking fuel out of the tap basically through a one way valve, that is spring loaded to close when it is not being sucked open.

Divuk is the person you need apparently.
____________________
DNA50 (sorry) ->> TZR125l >> GPZ500S

[simon1221]

Choke shouldnt make any difference. There should be an overflow pipe from the carb that would be directed towards the floor (hopefully).
____________________
DNA50 (sorry) ->> TZR125l >> GPZ500S

[tommivercetti]

Wouldn't it be flooding if the tap is letting fuel through when it should be off

[Scooby]

Of course it would make a difference. Check the choke is not on, check on the carb, not just on the bars. It might be sticking on.
____________________
A big enough hammer fixes anything!

[tommivercetti]

You can tell when the choke is on because it stalls when ticking over when warm if you put the choke on

[simon1221]

All the choke does is restrict the airflow and pull the throttle cable.

It has no effect wotsoever on the fuel line or the tank.

It stalls as the mixture (when warm) is wrong, and it basically floods it and it stops.
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DNA50 (sorry) ->> TZR125l >> GPZ500S

[Scooby]

[tommivercetti]

So if it was letting fuel through when it shouldn't be, it would come out of my overflow, which it isn't, so does that mean i'm loosing it somewhere else?

[simon1221]

A bike that is run with the choke on stops after 5 minutes more like as the spark plug is covered in carbon.
____________________
DNA50 (sorry) ->> TZR125l >> GPZ500S

[simon1221]

I would do some tests. Get a more clear view of the tank by removing body panels etc. You could always just fit a manual tap in the fuel line but it will be a bit difficult to use.
____________________
DNA50 (sorry) ->> TZR125l >> GPZ500S

[Scooby]