Bike cut out and died. Think its crap in the carbs... Help?

Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Right, bike rode the entire way to work and back today fine.

Get off the motorway, brake for a roundabout, get back on the power and it starts burbling like its going on to reserve. Except it's still got half a tank.

I get in to a layby and it dies the moment I take my hand off the throttle.

Go to start it again, same thing, starts burbles and dies. Trying to rev it just led to more ashmatic noises.

However, with the choke on it started, shot to 5k and sat there racing away like it was about to take off.

Oil light was coming on when it cut off, but apparently this is normal. Wouldn't mind a second opinion though. Oil level seems fine, battery is fine, fuel is fine...

I had it clocked as airflow, carb flow or *shudder* oil seizure.

But what with the weird choke foible, and the oil level being fine... carb over haul?

Anything I could do with getting in to do it?
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RS2MATRIX · Spanner Monkey Joined: 03 Apr 2008 Karma :

yeah oil light will only go off when the engine is running (assuming there is oil pressure)
open the tank filler cap and try and start it. If it starts then clean the filler cap breather.

if not, i suppose you could turn the fuel off, drain the carbs out and turn the fuel back on. might flush any crap out?
Had the tank or anything off lately, might have got a kink in the fuel line? Air filter on properly and clean?

bound to be loads of other little things to check
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Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Wafer_Thin_Ham · Super Spammer Joined: 18 Nov 2005 Karma :

Don't worry about the oil light coming on, that's normal on the CBR when the engine goes off as it is a pressure light as oppose to oil level.

Could it be a vacuum line's come off.

Sounds similar to what my GSXR did when I forgot to put a vacuum line back on. It would start up fine on the choke, but would instantly bog down if you touched the throttle. Thinking

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Cigaro · World Chat Champion Joined: 28 Mar 2007 Karma :

Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Arse. Need a good list of things to try on my day of Friday if I want itworking before next week. Which I do. Trains suck.

So we have breather/general hoses so far. What about stripping the carbs... what would I need to do it? ie, new gaskets? What to clean it with etc?
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Vincent · Banned Joined: 16 Oct 2006 Karma :

I'd leave the carbs alone for now, although if it's easy enough to get one off, it might be worth removing a float bowl and seeing if it's filling up ok. Sounds like it could be the breather as mentioned. Easy to find out if it is, just open the cap. Have you an inline filter on the fuel hose - could be that blocked too. might be time to clean the inside of the tank of any crud that's collected over the years.
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Bikeless · World Chat Champion Joined: 27 Jun 2008 Karma :

I'd agree with that,take your inline filter off and back flush it with petrol.I f you strip the float bowls make sure you have an exact fit phillips screwdriver as CBR float bowl screws are very soft and easy to chew up.

Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

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MarJay · But it's British! Joined: 15 Sep 2003 Karma :

Similar thing happened to the MZ when the main jet fell out of its holder. It was running on the idle jet and would run on choke but wouldn't rev and would die once the throttle got over a certain amount.

Could be a blocked main jet.
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Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Just been to check with the spare key, bike still doesn't start Confused

Arse. Won't run with choke now either... Thinking

Any other options then stripping the rat bastard down?
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule...

Pie-Roe · World Chat Champion Joined: 05 Feb 2007 Karma :

I had a similar problem on a fzr600, a week after I bought it there was so much crap in the tank and lines and stuff. After it cut out, I just put a litre of redex in it, and let it burn the crap out. Of course this is no good to you because you can't get it started.

Obviously you've changed the fuel tap to reserve to make sure it's not just gunk in the 'on' pipey bits?

Pyro
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Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Ah, just took the battery off to charge and optimate reckons its a dead duck.

I'm going to leave it a bit more to see if it changes its mind, then pop down the road to the bike shops and grab a new one. See if that makes any odds.

Just to be certain, the ' Sad

' face indicator means buy a new battery doesn't it?
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule...

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Best stick it on here as well as facebook so I can look cool.

90% of carb problems turn out to be electrical, even though they really seem to be fuelling. Never ever even consider opening up a carb that previously worked perfectly without checking the battery and charging system first.

By charging system I mean the easy check - ~14volts across the terminals at 5000rpm, checked with a multimeter.

In this case the fuel filter was recently changed, the bike previously ran fine, and you haven't been buying fuel in Serbia. The battery is fucked, so change it before breaking other bits.

Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Open a float bowl drain screw and see if anything comes out. That'll tell you if anything is getting to the carbs.

Then I'd check the fuel tap diaphragm for holes, assuming it's a vacuum feed fuel tap, and check to see if the fuel tap is clogged up inside.

Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Visitor Q · $25 whore Joined: 30 Apr 2004 Karma :

Sorted. Well, I know what it is.

Pour petrol in carb inlet pipe. Starts but runs crap (not enough fuel)

Pour petrol in fuel pump inlet pipe, it starts (cos I'd filled the carb inlet pipe) but runs crap and the level in the pump inlet doesn't move.

Swap relay (I had a spare, no joy)

Connect pump directly to battery, no pumpage.

So, case closed for now.

Do need some advice on cleaning a gammy fuel tank though, as that is probably the cause. Especially as the last funnel I used for petrol had some horrible white precipitate on it of unknown origin (probably from the petrol). I've some out in my old sump to see what nasties are left.
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China traffic/travel bike vid - When I make a sweeping statement, please add the word 'statistically' in to the sentence before you bitch...
From September 2014 to January/February 2015 I will not be using any English, nor reading any. As such, I won't be on here. PM at will, but I won't be checking/posting unless in emergencies. Certainly not for the first couple of months. Please berate me savagely if I break that rule...