motor bike boffins
Submitted by dakka on Sat, 2013-01-12 07:51
another question for you motor bike boffins out there.
why does fuel leak from bike, when bike turned off ?? turning off fuel tap stops it, but there must be a reason why, when fuel is on and bike stopped.
i am new to m/bikes so am still learning what to do to help my 2 boyz out.
i/ we have 2 bikes now a 125cc atomic bigshot for 15y old and a 250 honda ballistic for 17 year old, besides patterson rd off road area, is there any ware else around rockingham area we are able to go legily to ride.
thanx
dakka
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"If we all fish for the future now there will be fish in the future"
dakka
Posts: 275
Date Joined: 05/03/06
i googled it and it says it
i googled it and it says it could be a stuck fuel float, i might have to take the carby off and check for that.
"If we all fish for the future now there will be fish in the future"
allrounder
Posts: 1853
Date Joined: 10/11/08
Get yourself some carby cleaner
Give it a once over while you have it off
So tell me have you got your info from years on the water or hours on the internet?
Andy_b
Posts: 633
Date Joined: 19/10/11
i use to ride heaps at tomas
i use to ride heaps at tomas road but they closed that area down, and it was becoming harder and harder to find places to ride, and soon enough both my bikes got stolen from my house, brand new yz250 and a yz250f dowgs pricks
makai
Posts: 459
Date Joined: 28/10/08
Also check hose between tank and carbie
Many Chinese made bikes use vacuum hose for their fuel lines, which doesn't last long with fuel through it. It gets brittle and cracks. Could simply be a leaky hose (which obviously won't leak if the fuel tap is off). Otherwise the carby is the likely culprit as mentioned above. Take off, pull apart carefully - take note of what goes where and beware of the spring inside the slide launching itself across the shed if you take the slide off the throttle cable - clean with carby cleaner and reassemble carfeully. You'd be surprised what grief even a small amount of grit (usually not even visible) can cause in a carby. Don't be tempted to drill out jets if you think they are blocked. Use a bit of very fine wire to run through them, but never a drill bit.
Dustymongrel
Posts: 13
Date Joined: 05/03/11
Check the Needle and seat
When you have the carby apart, have a look at the needle (small pointy bit attached/slotted onto the float), if the pointy end has a ring around it it will not "shut off the fuel" when the carby bowl gets to the right level.
Can you tell where the fuel is leaking from, as in before the carby, out of the air filter etc?
Take photos at each step when you are taking the carby apart, including when it's still attached to the bike, and that will help when re- assembling.
And definetly, as makai said, check the fuel lines cos then you won't have to take the carby off at all.