Question about 1974 Yamaha RD 250

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Engine won't start but backfires every so often, and is now starting to leak gas out of the carb overflow constantly

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Sounds you have a problem with the carb float and needle assembly (i.e. the float and needle are not stopping the flow of fuel into the carb even when it is full as they should).

Backfires are a symptom of too much fuel in the combustion chamber typically. Try turning your shut off valve to "off" and let it sit for a day - then try to start it with the valve still off. Ideally it will start and run for a bit - until it uses the fuel available in the carb. If not - provide more detail.

Posted on Sep 10, 2009

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Posted on Jan 02, 2017

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Fuel dumping out of carbs / overflow- 1998 gas flowing freely ...

www.cbrxx.com > ... > Engine / Airbox / Exhaust / Fuel Delivery

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It will start / idle - sort of, but dumps gas out of the overflow/ carbs. I. ... If the carbs are over flowing while the motor is shut down one might ... to the bowls with outremoval of the fuel tank and maybe the air box or a ... valve/ petcock diaphragm drain line you see leaking below the bike. ..... Motorcycle Forum ...

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InstructablesApr 24, 2012 - Shut off the fuel line, drain the fuel from the carb, disassemble and verify the correct ... Then I started to notice fuel coming out of the carb intake. ... the carb (blew air thru the fuel inlet), turn the carb over (float upside down) valve ... Carb still leaking gas at the intake connection, where the choke is located.

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