Triumph Explorer stalling

[Speed addicted]

I’m currently on a jolly round Scotland with a couple of mates, my 2014 Triumph Explorer has started stalling while decelerating/stopped.
It seems to be doing it when the tank is full and we’re riding in slow traffic. It starts straight away and is running perfectly otherwise.
It has the big 20k service in 2019 but it’s only done 2k since then and everything gets replaced/checked. The service was done by a mechanic at my house while I was there so I know the plugs etc were actually done.
I’ve had it 7 years now, it’s never had any issues. Battery is new.
If you rev it to around 2k then shut the throttle the revs drop to about 500 before stabilising at 1000 again.

I’m wondering if it might be a tank breather or something,

Any ideas?

[Speed addicted]

jjones said:

When it stops take your helmet off and open the fuel filler cap to see if it sucks in a load of air when you open it, if so could be the breather that is probably built into the cap.

That’s a good idea actually, I’ll have a look

[Speed addicted]

Well that’s not ideal, I’ll live with it for the next couple of days until I get home and have a proper look!

[Speed addicted]

Had a look round the tank and hoses, nothing I can see is obviously perished.
I did see one post suggesting that the breather has a ball valve inside that can get gummed up, it would explain why it only seems to do it on a full tank and at low revs. Minimal air space above the fuel coupled with relatively little suction.
The Explorer tank and plastics are pretty complicated things to remove so I’ll have to do more digging once I’m home with better facilities than a hotel car park!

[Speed addicted]

Well that’s me home from a monsoon ride around Scotland, it is of course dry on the east coast where I live.

Put a tankful of super unleaded in this morning, it seems to have cured the issue!
I’m hoping it’s the cleaning properties of super that have sorted it rather than the bike wanting super all the time.