Why does my bike only run for a minute?

Motorcycle News (UK) - - Garage -

My 20,000-mile Yamaha SZR660 won’t run prop­erly. After win­ter I found the fuel sys­tem drained down and air-locked. I got it to run but if it was left for a day or two the prob­lem re­oc­curred. When I switch the ig­ni­tion on the fuel pump ticks and fills the float bowl as ex­pected. Hey presto, the bike fires up. I can ride for about a minute then it stalls. After a rest it restarts and runs for about the same amount of time. What could it be? Tony Sut­ton, email

An­swered by Charles Marvell, Fl­itwick Mo­tor­cy­cles I would say it’s ei­ther a faulty fuel pump or the float bowl breather is blocked, pre­vent­ing fuel get­ting in fast enough to keep the bike run­ning. You also need to make sure that it’s not some­thing like a kinked fuel pipe or rub­bish af­ter­mar­ket fuel fil­ter.

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