Question about Suzuki RM 250 Motorcycles

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Hi ive a rm 250 and its constontly leaking petrol from the over flow on the carb wen the petrol is turned on its happing wen the bike is running and turned off please help??

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The float in carb is stuck open. Remove the float bowl at the bottom of the carb dump out the fuel and trash in the bowl then use spray carb cleaner on the float needle area while gently lifting and releasing the float. Put it back together and try it. If the problem continues, remove the float and shake it. Anything inside the float? A crack in a seam on the float can let fuel/water into the float. This kills the ability of the float to shut off the fuel feed to the carb. Consider installing an in-line fuel filter to prevent future problems.

Posted on Mar 18, 2011

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1 Answer

When i turn the cock pit valve to on gas just leaks out the over flow


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1 Answer

Hi, I have a 1999 RS 250 Aprilia and it has a strange leaking problem. When you turn the fuel on, a minute or so later on the left hand side engine cover petrol leaks out. There is no sign of petrol...


Hi, Teedon and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue please visit the websites below. Good luck and have nice a day.
DOWNLOAD 1999 Aprilia Rs 250

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1 Answer

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the common rule is to have it adjusted within 2mm of where the gasket meets the carb and bowl. get a clear hose about 6 in long and connect to where the fuel is flowing out of while bike is off. bend it to where the side of the hose runs up and down next to your carb. it will show where your level is. then keep adjusting till its around the gasket. also check to make sure the rubber valve isn't missing or damaged in your float.

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1 Answer

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it sounds to me like the carb float levels are out of adjustment and it is overfilling the bowls,or,the needle valve seats are worn and leaking,which will allow fuel to continue filling the bowls even though it looks like they are closed,remove the carbs from the bike,remove the bowls,turn the cabs upside down close the floats(push them right to the top,this simulates full bowls)then blow throgh the fuel inlet pipe,if you can hear air escaping from around the seats they are faulty,also check that the seats themselves are tight in the carb body,i dont know why but gsxr carbs seem to shake the valve seats loose..hope this helps

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You have an air leak on the intake side of the motor. Get new carb and carb manifold gaskets. Tighten the bolts down evenly in three stages. For the exhaust, try the link below. It is a high temp silicone sealer.

high temp silicone (red)

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