UPDATE - Bandit now starting, running rough - Video

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Had a couple of problems so far as you can proabably see from my other threads but this one has me stumped!

I started the bike in the usual way, bit of choke, and set off. Seemed a bit stuttery going down the road and a minute later it just refused to rev and just cut out. It would then start but only stutter at about 500 revs before cutting out. Cue me pushing it home.

Anyway, just went back out to try and start it about 20 mins after bringing it back and it wont start at all now. The started motor just goes over and over but wont start the bike.

One of my mates said it might be flooded, another said that it might have been left for a while and crap from the fuel tank might have blocked the carbs.

Any help really appreciated!
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

spiderwheels · Two Stroke Sniffer Joined: 20 Feb 2010 Karma :

It sounds like running out of petrol. You can try unscrewing the drains on the carbs and check fuel flows out. Smile

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Petrol seems fine though. Looked in the tank and there is plenty in there.
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

spiderwheels · Two Stroke Sniffer Joined: 20 Feb 2010 Karma :

but is it getting through to the carbs?

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Yup, just went and loosened that bolt, petrol was dripping out.
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Just had a look in the tank, and although the petrol seems ok, the level seems to be below some sort of nozzle sticking up. Im thinking it might be on reserve and may be a problem here?

Cue paint diagram:
https://img32.imageshack.us/img32/7166/tankpoblem.jpg
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Could just be reserve. From memory on the Bandit, tap pointing down is normal, tap pointing up is reserve and tap in the middle is prime. On and reserve will need the engine running for fuel to flow (vacuum fuel tap). Prime will allow fuel to flow whether the engine is running or not.

All the best

Keith
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spiderwheels · Two Stroke Sniffer Joined: 20 Feb 2010 Karma :

Yes, they'll be another nozzle a bit lower down that operates on reserve.

But you did say there was fuel in the carbs. Did you check all 4? If there is fuel in the carbs it can run for a few minutes even with the fuel tank disconnected.

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Hi, the bike won't start in any of the fuel petcock settings though. Ive tried it in reserve, but also prime as i didnt know fully what it did which may have made the problem worse.

I only checked one carb, assumed if one was getting fuel the problem must be elsewhere.

Cheers
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

I would be more inclined to suspect that it is flooding. Dirt in the needle valve.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

That would just dry the plugs, and they would be drenched again rapidly if you restarted the engine. You could probably take them out and give them a clean (burn the fuel off them with a blow torch).

Most likely causes of flooding would be a float height set incorrectly, float punctured, worn needle valve or a dirty needle valve. To check any of these properly means taking the carbs off (which is a pain on the Bandit, if you unbolt the airbox and slide it back there is only just enough clearance to get the carbs out). However if it is just dirt in the needle valve (probably the most likely thing to suddenly occur) then sometimes you can fix it by tapping the carb float bowl (use the handle of a screw driver).

Just don't leave the petrol on prime. Or you might land up with the 3/4 of the contents of the petrol tank draining through the carbs into the airbox and engine overnight Whistle

.

All the best

Keith
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Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Right so today i had a good look, took tank off etc. All the pipes seem fine, and i even filled the tank back up with a jerry can up above the main tank pipe.

Still no luck though. Really am confused. It just didnt want to start.

So i took off the fuel tap completley and there was some sediment in the reserve pipe. I assume this is what might have caused the problem but the bike still didnt start when the tank was filled back up, not using the reserve pipe.

Spark plugs also seem fine.

Really stuck with what to do now Confused

Cheers
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

spiderwheels · Two Stroke Sniffer Joined: 20 Feb 2010 Karma :

If you've found sediment then it is likely found its way into the carbs so filling up the tank won't help.

If you want to check if the float needles are closing correctly, get some clear tube that fits snuggly over the drains on the carb float bowls. Hold the pipe up and open the drain. The fuel should flow up the tube to be about level with the top of the float bowl - if it continues past that level your float needles isn't shutting and that's causing the flooding.

If it doesn't flow up that far then you have a blockage.

You'll have to check all 4 carbs.

If it is flooding a sharp tap on the float bowl might fix it.

Unfortunately it seems sediment from the bottom of the tank is getting through to your carbs. Are there no fuel filters on the fuel tap?

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Alright ill give that a go tomorrow, cheers.

Nope, no filter. The haynes manual says there should be one, but i guess that might be on the newer models, or the fuel pipe changed at some point.

If there was sediment, would this have gotten into all the carbs? Or just 1 or 2?

So hold the pipe like this and check the level?
https://img96.imageshack.us/img96/9639/carbprobelme.jpg

Cheers
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

spiderwheels · Two Stroke Sniffer Joined: 20 Feb 2010 Karma :

Nice diagram Thumbs Up

Seeing as you've got the Haynes the whole procedure for checking the fuel level should be in there - although millimetre accuracy in the fuel level isn't necessary to get it to start!

You'll have to check all 4 carbs. If it turns out that none of them are flooding the sediment has probably got through to the jets.

If you have to strip the carbs you will want to make sure you've got some sort of fuel filter in place before you connect your fuel tank back up - you will have to use the prime position on the fuel tap which probably feeds from the reserve where all the dirt is.

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Lol cheers. Ive ordered a fuel filter so ill get that fitted.

Was thinking though, to check for a blockage, can i drain the float bowls on all the carbs, then put the tank on prime to let the petrol flow to them.

If the float bowls do not fill back up this would indicate a blockage? But if they do fill back there could still be a problem?
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

Problem is probably not a blockage from the debris, more that the debris is holding things open.

If you are lucky then draining the carbs then sticking them on prime will flush it through (but put a filter in first to stop fresh debris just coming straight down again).

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Ok thanks ill try that. Dont really want to face a carb stripping. Would it likely be the case that all 4 carbs have been clogged with the debris?
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

Kickstart · The Oracle Joined: 04 Feb 2002 Karma :

Hi

No way of knowing really without checking them all individually.

All the best

Keith
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Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Its the taking off the bike part i assume will be the trickiest.

Just out of interest, how much do garages charge for a carb strip and rebuild? Id like to think im at least saving a bit of money doing it myself!
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

Forgive the guys english, but this will give you the right idea.

https://www.youtube.com/watch?v=3JOymZR_rUs&feature=fvw
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Some shite cruiser. Now with guns and FREEDOM!

temeluchus · World Chat Champion Joined: 01 Oct 2008 Karma :

Ditto · Nearly there... Joined: 26 Sep 2009 Karma :

Cheers for the video.

So i should expect to take the float bowl off, and find sediment from the fuel tank in the 'Needle Valve Assay', number 11 on this diagram?

https://img713.imageshack.us/img713/4316/carbdiagram.jpg

I owe you all a beer if this fixes it Razz

Cheers
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CG 125 > Bandit 600 > CBR 600 FY > Street Triple R