sr250 cutting out

[skikman]

hi all.the last few times i went out for a run on my yamaha sr250 it cut out after 15-20 miles.it was like i had flicked the kill switch.it starts up again ok but keeps doing it now and again.today though it started up again but after a big backfire.where do you think i should start looking?

[Im-a-Ridah]

When did you last do some servicing on it? And do you know what was done?

[Efes123]

Deffo fuel related, if you hadn't guessed. I seem to remember having a car with that problem and it turned out to be a split in a fuel hose and air was being sucked in.
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[Robby]

It could be fuel related, it could be electrical. I've had similar problems caused by fuel and electrical problems.

Can be a bugger to chase down, but start with the following:

1. Service the bike, including new filters and spark plug(s).
2. Drain the carb(s) into something clean and look for evidence of water in the fuel.
3. Charge the battery.
4. Spray the HT lead (the lead from the ignition coil to the spark plug) with WD40.

These things may fix it, if not they give a good foundation for fault finding.

[skikman]

[reckless_b]

possibly fuel tank breather blocked starving engine of petrol, after you've been stood a bit tank pressure equalised again, when it cuts out check for fuel in carb by opening bleed screw at bottom of float chamber, also could possibly be float in carb sticking up, same check as previous but if float chamber empty tap carb body with something like a screw driver handle to see if it cause float to drop and let in fuel.
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40 years on the road on and sometimes off bikes with a very recent OFF

[skikman]