New owner help

[Snapey]

I sold my bike a couple of weeks ago but yesterday was the first opportunity the new owner had to see and ride the bike so when he rang I thought it was to tell me how good the bike was. Wrong ... it was perfect until he stopped for a coffee then when he started it there was a smell of petrol and a very sick motor. I told him about the paper clip test but he said the FI light wasn't on so that probably rules out an STVA issue & the fuel pressure regulator is wired in so that can't come out. Among the spares I sent him was another fuel pump so maybe the regulator has failed but other than swapping the pump I couldn't come up with any suggestions.

I know he'll ring back so do you guys have any ideas as to the likely problem?

[KiwiCol]

Float level set too high in the carbs & flooding it?   

I wonder if it's stuck somehow in cold start mode, where it runs richer?    It's odd that it was fine till he stopped & went to start again & then it's no good.   Plug lead off, that'd do it too.

[Snapey]

When it left here Col it was perfect and also for the first part of his ride. My guess is that the pressure regulator has failed and is pumping too much fuel to the injectors. I sent him a manual with the bike so he should read that and do a flow test.

I'd probably have it sorted in 5 minutes but the bike 160km away & I'm limited to 5km with this lockdown.

[Eric GSX1400K3]

Regulator it could be, but that would make it run really rich, but still run.

Unusual to have a strong petrol smell unless there's a leak in the system. Get the new owner to check the fuel line, it may have failed or come unclipped.

Other than that, a failed injector o-ring or fuel rail?

[GSXKING]

No warranty on private sales bud. 

[grog]

Thats a bugger Snapey. Fuel smell? Exhaust or just around bike? Once when a battery failed, my bike started but backfired running and over fuelled, strong smell from exhaust. No idea why, defies logic, battery tested stuffed, replaced and never again.

[Snapey]

I've given Allyn (the new owner) the address here so hopefully he signs up but I also suggested he study the manual for likely causes. He said it's also backfiring through the injectors. There is no error code so I gave him a list of things to try but as Grog said maybe something simple like a flat battery.

[VladTepes]

Float level set too high in the carbs & flooding it?   

*** cough *** fuel injection.

[KiwiCol]

Float level set too high in the carbs & flooding it?   

*** cough *** fuel injection.

Really??    well there ya go, no more carb cleaner in the fuel for me then . . .   

[Eric GSX1400K3]

 He said it's also backfiring through the injectors.
[/quote]
Haven't heard of that before, can you do a Pauline Hanson for us ?

[KiwiCol]

He said it's also backfiring through the injectors.

Haven't heard of that before, can you do a Pauline Hanson for us ?
[/quote]

Yeees, when I read it was backfiring through the injectors, I did wonder how the chap managed to deduce that!?     What's it doing? blowing pressure back through the fuel rail & into the tank?   

[gsxbarmy]

Could it be a failing or sticky clutch switch and ECU thinks its in cold start mode so over fueliing?

[grog]

Looking fwd to the answer from this one. Not enough conclusive info to help yet. Ive had 2 cases at work, Holden Commodore V6, fuel smell and back firing thru inlet. Injectors cant back fire unless seal rooted, probably wouldve burnt bike. Answer with Holden was, injector had gone faulty, just pouring fuel into cylinder. Established this with camera thru plug hole, amazing footage. New injector, prob solved.

[Eric GSX1400K3]

Looking fwd to the answer from this one. Not enough conclusive info to help yet. Ive had 2 cases at work, Holden Commodore V6, fuel smell and back firing thru inlet. Injectors cant back fire unless seal rooted, probably wouldve burnt bike. Answer with Holden was, injector had gone faulty, just pouring fuel into cylinder. Established this with camera thru plug hole, amazing footage. New injector, prob solved.

Lucky it was a petrol motor. I'm at over 200000km on my diesel v6, thinking about replacing all injectors as if one was to do that and hydraulic a cylinder it's new motor time.

Injectors are mass produced,so there are bound to be ones outside the tolerance zone.

[Snapey]

Looking fwd to the answer from this one.

You're not the only one mate.

The backfiring from what I can gather is the spitting noise you get with an intake air leak or bad timing. I've given him the address here so he can tell you first hand what the problems are instead of me losing something in the translation. I don't know if he's joined but he's also asking questions on another 1400 site so the answers from them have him confused.

I've given him a list of things to check but I haven't heard back and he won't see the bike again until next weekend.