Leaking fuel when start. Wheel wont go on either.

[ProXimaCore]

I'm working on my bike today. I've spent an hour trying to get the back wheel on. It's not for happening. It wont fit by 1mm. Pain in the arse. Not to mention you need 4 arms to try and get the thing on while holding the bits in place and then knock the bolt through. But that's not my main concern just now...

To make things even worse, I just tried starting the bike. It's got old fuel in it so i figured it wouldn't go. It did start eventually after 10 mins. When it did start, all this fuel started pouring out the bottom of the bike from somewhere. I mean loads of it! Quickly turned the bike off and it slowly came to a stop. There's still some fuel in the tank. No idea what happened. It's just been sitting there all winter, I haven't touched any of that part. Any ideas what caused that?


____________________
Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing

[cc123]

Any chance of a cracked fuel line or something with the cold?

I have no idea wot I'm talking about!! ^^^^

Have you tried to drain the old fuel from the carbs? Maybe the screw is slack or undone causing the fuel to pour out??
____________________
Old bikes >>> https://www.bikepics.com/members/cc123/

[Scotsman37]

Either the fuel hose has split open or it's not connected properly. What you need to do is to check every connection and tubing from where it starts coming from the fuel tank and carbs until it reaches the engine itself to eliminate any possibility there. Have you checked to make sure the fuel is not a finding a way down from the outside the engine from above to end up dripping from the bottom? Does your bike have two hoses and are they both connected to the fuel tank?

P.S. Don't light a match or create spark any where near your bike until you've washed away the fuel from around the bike - Boom !

[Git]

I will take a guess and say there may be a bit of cack playing silly buggers with the needle valve possibly.

[AcIdBuRnZ]

Fuel hose may have perished over the winter?

Happened on my NSR couple years ago.

Bugger to hear that Dave
____________________
Past: Honda NSR125R >> Kawasaki ER-5a2 >> Kawasaki ZZR-600e1 >> Suzuki GSXR-750Y >> Honda VTR 1000 Firestorm
"Chickity China the Chinese Chicken..."

[catgate]

I once had a similar problem some years ago. It turned out that there had been a small amount of water in the float chamber when the bike was labandonded for a few winter days. This froze and expanded and gave the float a severe crunching. Result...no shut off of fuel by float ..cos it was holed.
____________________
"Always remember you're unique, just like everyone else."

[Guest]

Cracked hose or sticking needle valve as suggested, not a lot else to go wrong.


Back wheel's are notoriously tight to get in on some bikes, it's often best to get another pair of hands even if only to knock the spindle through while you're holding the wheel in. As long as all your spacers are in the correct place it's just a case of forcing it into the swinging arm. The cush rubbers in the sprocket holder are the usual suspects, you need to stand on the sprocket to get it seated right in - a squirt of WD helps and stops the rubbers creeping back out.

[AcIdBuRnZ]

Just remember Dave that the wheel has been in there for years, it came out so it'll go back in!!!

Have you been able to trace the fuel leak?
____________________
Past: Honda NSR125R >> Kawasaki ER-5a2 >> Kawasaki ZZR-600e1 >> Suzuki GSXR-750Y >> Honda VTR 1000 Firestorm
"Chickity China the Chinese Chicken..."

[cc123]

Hey David, any joy in getting your wheel and fuel leak fixed??
____________________
Old bikes >>> https://www.bikepics.com/members/cc123/

[ProXimaCore]

I just noticed something. The fuel tap was on prime for over 3 months. Would this have caused the problem?

Wheel is still being a bugger. I need someone to help me. But they're all complaining it's too cold to go outside.
____________________
Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing

[instigator]

Hmmm, fuel tap on prime...for three months....hmmm.

My kwacker manual warns never to leave this on for more than a night.

"the engine may become flooded"

Have you taken the tank off yet and checked the pipes? They CAN, through age, harden and crack.

Jump onto 400greybike.co.uk and see if theres any tips/tricks to getting the rear wheel back in.

[Git]

If the leak is coming from a perished hose then surely the fuel would continue to leak out no matter what the engine is doing, especially if it has been left on prime?

Not sure why but i'm being drawn to a problem in a float bowl.

[ProXimaCore]

[cc123]

Hope you get it fixed in time for sunday
____________________
Old bikes >>> https://www.bikepics.com/members/cc123/

[ProXimaCore]

Well I got the wheel on after great difficulty.

Tried bumping the bike down the hill. Engine didn't even make a sound. Just locked the wheel. What should I do from here?
____________________
Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing

[cc123]

Can you not use jump leads rather than bump it? Might be more successful getting it started? How long has it been sitting?

My mate started up his Bandit only 2 weeks ago after sitting for 2 months, took at least 10 mins to get fired up and running. Started using jump-leads tho....??
____________________
Old bikes >>> https://www.bikepics.com/members/cc123/

[ProXimaCore]

[cc123]

Have you not found out where the leak came from then?

I dunno. I'm no mechanic...

Simple things but don't take offence.....
Check the fuel tap is back to on?
Any chance maybe you've bumped the kill-switch to off and not noticed?
____________________
Old bikes >>> https://www.bikepics.com/members/cc123/

[ProXimaCore]

Crap, I'm just making this worse. Took the tank off. There's 4 hoses on the underside. 3 of them on the tap, and one just over a bit on it's own. When I took the tank off I accidentally detached the hose that's on it's own at the bike end instead of the tank end. I don't know where it came off the bike though. So now I'm stuck. Does anyone know what this sounds like it came from?
____________________
Honda NSR125R -> Suzuki GSXR400R GK76a -> Kawasaki ZX636 B1H -> Honda CBR400RR NC29 -> Nothing

[Kickstart]

Hi

Normally prime allows the fuel to flow when the engine is stopped on bikes with vacuum fuel taps, while on and res will not allow fuel to flow unless the engine is running.

I would have said that you have a needle valve problem, or possible a broken / displaced fuel line. However if it was left on prime then both of these would dump the fuel out whether the engine was running or not (depending on where the breather and overflow hoses go).

As such I would guess that maybe the bike has dumped a very large amount of fuel through the carbs and into the crankcases. When you have started the engine up it has pumped a load out of the crankcase breather hose. To check for this, check the oil level. If it is high or stinks of petrol then change it immediatly (and do not try running the engine until you have done so), as petrol is a very poor lubricant.

I had a similar problem on the Bandit just from leaving it on prime overnight. It dumped about 3/4 of a tank of fuel through the carbs and into the engine and airbox due to a sticking float.

While you are playing check the carbs over carefully and also the fuel hoses.

All the best

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

[Kickstart]

[ProXimaCore]

[cc123]

So you can fix it?

Don't want you missing out, looks like valver ain't coming, can't get a clutch lever for his bike ....
____________________
Old bikes >>> https://www.bikepics.com/members/cc123/

[ProXimaCore]

[Kickstart]