SV cutting out

[munkygunn182]

Hi all,

Just passed my test today and went to take the bike a ride today. It fired up on the button, but cut out at the end of the road, started up again, backfired and died, started again, rode normally. At the end of the ride, had it switched off in the drive, and the same happened again, but without the backfire.

The bike in question is an SV650S K6 on a 2006 plate. Completely standard. Only change was today I changed the ECU to a 33bhp one. After the ride I swapped back to the standard ECU and the bike fired up and idled quite happily. I attempted to prove a faulty 33bhp ECU by swapping the restricted one back in, but the bike fired up and idle's happily.

Safe to say im rather confused! Should note, i haven't had a chance to get it back out a ride to prove or disprove the ECU swap since i got back.

Any help would be great!

has the bike been stood for a while with old fuel in it?

[munkygunn182]

It's been stood about a week underneath a polythene sheet

was wondering if it was just dodgy fuel in it.

Thats not Ralphs old pointy is it?

[munkygunn182]

It's just the fuel it was delivered with, i couldn't vouch for its age or origin

[munkygunn182]

Yeah its ralphs old pointy, how did you guess?

cause it cuts out....








Just kidding!
Theres not many red pointys about and know hes just sold one.
Give him a shout and ask him how long the fuel has been in there.

Check the basics first, Battery, fuel filters and breathers. Also if it's been under a tarp and outside in this weather it's quite possible that the damp has got at the electrics.

[munkygunn182]

The battery was pretty weak to begin with, seemed strong enough after the run though, don't know if that would affect?

It would. Petrol engines usualy rely on the battery to provide the low-tension juice to the ignition system, week battery means week spark.
Often when the reg/rec has failed (isn't charging the battery) the first sign is that the bike will start and run for a bit, then just dies. You can often restart as the battery recovers a bit, but then the same happens.
Might not be the answer in your case but worth eliminating from your equiries.