Cold stalling, but fine when warmed up...?

[Rocky Mountaineer]

Strange thing this am. Bike serviced a few weeks ago, filled up at Tesco on Friday, rode Monday and Tuesday. Bike ran sweet. Day off the bike yesterday for client meetings, back onboard today. Bike stalled cold, restarted but felt hesitant in low gears. Burped, farted when gearing down. No probs in 3rd+ gear or running in town later. Then near noon, coming back from bank meeting, bike stalled when taking off. Had to rev the nuts off her to get her moving from 1st, but then fine in 3rd+ gear. Nearly stalled in 2nd gear at roundabout, so took it through to BMS ABZ. They were great, took her straight in, but .... nothing found?! Plugs fine, coils fine, diagnostics fine. Bike now fine, but a bit worried about tomorrow am.

Anyone have similar experience. She seemed fine on road test, and then back up the road to work. Really puzzled.

 

[Nutty]

filled up at Tesco

Think you've answered your question already.

 

[Beemerman59]

I had a mystery misfire on the RH pot - it would run as sweet as anything and then would randomly cut out and cut in again. Turned out to be water in the RH fuel injector connector. Its worth having a look for either water or the beginings of corrosion to the contacts in those connectors.

 

[Rocky Mountaineer]

Think you've answered your question already.

You're probably right. She was fine this morning on the run into work. Needed to fill up again, so went anywhere but Tesco. Weird.

Will have a look at the fuel injector connectors, though, to see if there's any corrosion ... (just in case).

Thanks!

 

[Nutty]

You're probably right. She was fine this morning on the run into work. Needed to fill up again, so went anywhere but Tesco. Weird.

Will have a look at the fuel injector connectors, though, to see if there's any corrosion ... (just in case).

Thanks!

I always make a beeline for Shell or BP, and every other tank will use Super Unleaded. Not sure if it makes a difference, but all my bikes run very well!

 

[cookie]

I always make a beeline for Shell or BP, and every other tank will use Super Unleaded. Not sure if it makes a difference, but all my bikes run very well!

why would you do that? if it's better, why not use it all the time?

 

[duckspeed]

If the fault developed after a refuel, then I recon it's fuel related. It's not unusual to get water in the fuel. I know it's often done to death but I am convinced supermarket fuel is pourer quality.
It surely can not be related to your riding gear, as I am sure you look resplendent in your Rallye 3 suit

 

[pistolpete]

ive had a car and bike do this after using petrol a couple of years back, althogh i couldnt prove it was the petrol it stopped me using it

 

[cookie]

strikes me that if the fuel was at fault, it wouldn't mysteriously fix itself, or have i misunderstood the circumstances?

 

[Beemerman59]

strikes me that if the fuel was at fault, it wouldn't mysteriously fix itself, or have i misunderstood the circumstances?

I agree - water would sit at the bottom of the tank and therefore be picked up first by the fuel pump, not after two days of use when the bike ran fine.

 

[Mr K]

Water in the gap under the FPC?