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I have a 2003 TTR 125, Bike runs great but everytime I turn the gas on or reserve it pours out of the overflow onto the ground...any ideas on how to resolve?
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There is a frame number stamped on the frame neck. If you call a dealer they can look up the year and model using an ID microfiche. Next to the stamped frame number there should be a riveted plate with the VIN number on it . If this plate is still on your frame it also has the model number and the model year of the motorcycle clearly printed on it. All Yamaha dealers have the ability to ID your machine using the Vehicle Identification Number.
There is usually "on","Prim",and "Res". If in the on position it only uses fuel when the bike is running. so thats where it should be unless your low on gas and need reserve. The pri position should only be used for a few seconds or used to start the bike and once started should be switched to on.
The only way that can happen is if gas is overflowing in the carb and running down the cylinder wall and into the exhaust port and / or into the crankcase. Gearbox oil is separate from the crankcase. The crank gets lubrication from the gas/oil mix. Be sure to turn off the gas valve at the tank when the bike is not in use. If you can manage it, pull the head off, (or at least remove the spark plug ), then, with the piston at bottom of the stroke, turn the bike upside down to drain the gas from the crank. I would then remove and clean the carb to be sure the float is not sticking open. Be sure the overflow line is not blocked. Install an in-line fuel filter. Please rate my answer. Thanks.
it's probably just your overflow from the float. it doesn't connect to anything, it just let the fuel overflow come out when your float level is high. if you turn on the fuel petcock and it starts pouring out, your float needle is sticking. clean the carb and the float needle valve assembly and see what happens.
With the oil problem I read on another site that Yamaha did that so that excess oil would be burned up in normal running (but this was usually smaller amounts). Anyways they disconnected the tube going to the air cleaner and had tied up in such a way that any excess oil would land on the chain thus lubricating it. But if you have that much oil coming out it could be that you have put in too much.
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