Bandit Dies On Me!

[sparkywilliam...]

X reg Carb GSF600 35k Miles

So Far i Have:

New Sparks / cleaned leads
New Fuel Filter
New Air Filter
Emptied Air-Intake Waste Pipe (quite a lot of crap spilled out)which leads me onto...
The Carbs - I'm bricking it about taking the Carbs off to clean them as it doesn't look very easy-i know 'man-up' I hear you all say-Guess it's necessary considering my previous point?!

Yet still,after 20 mins of running and feeling she's warm & good, she will suddenly feel like she has run out of fuel and leaves me looking for somewhere to pull in.
Then after waiting and fiddling with the petrol valve and then turning on the choke she will eventually start.
Then after another 20 mins she will do the same.

She sounds proper rough when i use the throttle to try and keep up the revs to get home in time.

Anyone have any ideas?


Thanks
Mark
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[doggone]

Vacuum in fuel tank due to blocked vent?
Try opening it, might hear a 'sharp intake of breath'

[P.addy]

Got a PRI option on the fuel tap?

Use that and see if your problem clears.

If so check your vacuum pipe for splits and if its not that check the diaphragm in the fuel tap itself. Fuel tap rebuild kits are cheap on the bay

[sparkywilliam...]

Vacuum in fuel tank due to blocked vent?
Try opening it, might hear a 'sharp intake of breath'

been doing that.

Got a PRI option on the fuel tap?

Use that and see if your problem clears.


i'll run her on PRI and see if it happens again (will it harm running this for a while ?-what does that option do?-it thought you opted for this when the bike is hard to start?)
I'm thinking it might be the vacuum pipe as you said.

So no need to do Carb clean for now?
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[SuzukiTom]

[sparkywilliam...]

i'll try that cheers fellas.
after a search i've noticed lots with similar prob,must be common!
will run her on PRI for a while
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[Moxey]

Have you cleared the tank breather? Its actually located in the cap itself looks almost like a tiny jet on the underside of the cap when you take the cap completely out. Simple job and worth a check, mine was blocked but didn't solve the problems I had.

https://www.youtube.com/watch?v=1lG0M60mwxo (visual guide to what people are suggesting it causes)

Been looking at my plugs lately and found mines running lean again, took it out last night round my local bypass to about 60(ish ) and when coming back into town to my house the bike felt flat, poor throttle response and tickover was slightly lower (enough for the lights to be flickering due to low alternator revs).

So turned fuel tap to prime and shook the bike abit, revs climbed up and light stopped flickering, took bike for a spin around the block and it was perfect again, throttle response was instant etc.
So problem must be fuel tap on mine leading to fuel starvation when cruising at high speed/revs but I've already renewed most of the service items in the tap so can't comprehend why it still doesn't work properly on vacuum yet (filters are clean also).

Just saying you should check if its your fuel tap or cap thats in the wrong, I've narrowed mine down to the tap but no idea whats possibly wrong with it.

Running on prime should be fine as long as you check the Float heights are correct and valves are working! The CV carbs were not designed to be fed from a gravity fuel tap so when on prime they have a tendency to flood if theyre not pretty much perfectly set up at the float valve to prevent overflow etc.

(if you don't have a Haynes, Floats should be 17mm + 1mm)
____________________
Current: 02 FZS 1000 & 91 Royal Enfield Bullet 350 Some Bike Pics...
'I was too busy paying attention to pay attention'

[P.addy]

PRI is the prime option.

Basically a vacuum operated tap only works when its running/cranking.

If your bowls are totally drained, you'd have to crank over to fill the bowls. With PRI it just ignores the vacuum. What I do with PRI is use while im riding and when its parked up I set it to on or off... i've heard of it just continuing to flow fuel.

[sparkywilliam...]

Have you cleared the tank breather? Its actually located in the cap itself looks almost like a tiny jet on the underside of the cap when you take the cap completely out. Simple job and worth a check, mine was blocked but didn't solve the problems I had.

I've checked this visually and doesn't appear blocked.

Ran today on PRI and absolutely no problems

what next?

Shall i take tank off and check whether i have similar result as that Youtube video showing the petrol flow slowing and increasing once you remove petrol cap?

thanks guys
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[P.addy]

Either a vacuum pipe from the fuel tap is torn/worn/missing/disconnected ...

Or

The fuel tap diaphragm could have perished, fuel tap rebuild kit from ebay sorts it

[sparkywilliam...]

Right..
i have taken off the tank and tested the fuel tap such as in the youtube video.
When it's set to either 'reserve' or 'on' no fuel comes out but once set to 'Prime' fuel flows continually at a good rate regardless of whether the fuel cap is open or closed so obviously my problems running on 'On' do not appear to be linked to the tank breather problems people have had in the past.
i have blown through the vacuum pipe and that is clear (obviously i don't know how to check whether the valve is slides onto on the carbs is okay)


What does anyone suggest i do next to solve this?

thanks all
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[P.addy]

You taken the fuel tap apart?

When my GS500 only ran on prime, the diaphragm inside the tap had seen better days, rebuild kit from ebay and it was back to normal!

[sparkywilliam...]

i have done yes,but perhaps i should do it again to check..i presume i'm checking for a good seal? and no gaps?
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[Paxovasa]

Petrol should not come out of the tap when the tap is in the on position. They are vacuum fed.
____________________
Suzuki GSF600 K3 (in the fastest colour, black).

[P.addy]

[Paxovasa]

[P.addy]

To be honest...when mine did that.. I just swapped the vacuum tube and the fuel tap was rebuilt... I hate stuff that has more than 1 possibility... just fix them all

[sparkywilliam...]

''Shows how to test it etc, suck and hold tube etc.''

it didn't show that ...so is that a trick to check the vacuum element?
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[P.addy]

[sparkywilliam...]

Paddy...Thank You!
Just done that and fuel flowed out easily when on "reserve" & "On" so i can presume there's no need to take petcock apart.
so what next?

Just to fill you in on history of bike,it's always done this...-stalling when set to 'On' after pro-longed distance journeys...malarkey since i've owned her last year.I'd stop for a bit and then play about with the petcock/choke and then after 10 mins she would start again.I thought it was lack of fuel but could see lots in the tank-it seemed to run okay once she was filled up to the max.
She was laid up for 6 months while i was replacing the swingarm so i dunno if any fuel has got gummed up in the carbs?

Anyone's next suggestion of what i should do next please?
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[P.addy]

Check the larger "tube" for the fuel...possible you have a blocked filter or fuel tube.

Silly thing.. you do have enough fuel in there to test the ON option right?

[sparkywilliam...]

yes tank is up to the max.
The fuel filter is a brand new 'clear style' fitted correctly.
I'll take off the fuel line that goes to the carbs and check it now.
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[P.addy]

[quote="sparkywilliams"]yes tank is up to the max.
The fuel filter is a brand new 'clear style' fitted correctly.
I'll take off the fuel line that goes to the carbs and check it now.[/quote

Sometimes you get a fuel filter within the physical fuel tap also...not an inline one which I think you have?

[sparkywilliam...]

Got both on this one,and i checked the gauze in the petcock one when i dissasembled it.
____________________
Previously CG125,YBR125 Now GSF600 Bandit

[P.addy]

This is the tap.

https://i.ebayimg.com/05/!Bk5lr%20QCGk~$(KGrHqIOKiwEtkck%20vuWBLZdYKBQjQ~~_35.JPG

You might have a blockage on longer one..
Im not sure if these have a built in fuel filter... would assume so as my GS500 did and thats prehistoric.