Question about 1998 Aprilia RS 125 Extrema

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Aprilla 125 extrema 1993

Small pipe bottom of carb leaking fuel bad

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  • gumb91 May 11, 2010

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Hi there i need help cant think of anything else i have an rs 125 it a 1994 extrema its been great but in top gear the power blade doesnt open but it wants to, in all gears its great just top gear

Posted on Oct 30, 2009

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Hi,
You have not mentioned working on the carbs, so I am presuming that this is a 'new' problem.
Your bike has plastic floats in the carb. With age the plastic perishes a little, and the floats fill with fuel and stink. This prevents the fuel being shut off when the float chamber is full..
Open the carb an check weather this is the case.
If not, inspect the needle and seat for wear.
Lastly set the float level.

Good luck

Jon

Posted on Feb 19, 2009

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1 Answer

Carb overflows when not running


Im not familier with your specific bike but here are some ideas:-

First check the float valves, these are usualy in the bottom half of the carb. Take the bottom off, and you will see a plastic float, attached to the float will be a small bullet shaped piece of metal with a rubber coan on the top (may have to remove it to see it).
Remove the float & the valve, make sure there is nothing stuck on the float valve rubber tip, and nothing is in the hole where the float valve sits.
If this looks ok, next check the float levels, you may need a Haynes manual or similar to find out specificaly how you do it as you may need measurements.
Dont panic, this is a fairly simple thing to do (trust me Im no expert), you will need to repeat this process on all the other carbs (if you have more than 1)

You can also check your vacume valve (if you have one). Its a small pipe that connects from the carbs to the peterol tank (This is an additional pipe to the fuel pipe), this creates suction when the engine is running opening the fuel tap on the tank, letting fuel flow, if the tap is stuck, or the vacume pipe is damaged this could allow fuel to flood the carbs, (shouldnt if the float valves work correctly, but worth a try)

I hope this is of some help....

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I have a 2008 Derbi Senda Terra 125, it has been stored for 10 months. I have tried to start it but it is leaking a large amount of fuel when cranked, the fuel is coming from a pipe with a 90 deg angle and...


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Alex,
PS-Don't forget to vote me, thanks

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Check for cracked fuel hose or bad connections at the tank and carb. Is the fuel valve body leaking gas where it mounts to the tank? Heck, with the bike being 36 years old the tank may be leaking at a weld or due to rust through. I wish I could work on your bike. The older bikes are more fun to work on than the newer bikes. Post a reply and let me know what you find.

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I have been working on my carb today,the pipe from the bottom of the carb should just run down by the bottom of the swinging arm,there should be another pipe from the pipe on the left side of the carb just above the fuel intake which also runs down to the swinging arm and connect to nothing.
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