Question about 1981 Honda CX 500 A

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Bike is stood with the petrol tap left on but petrol pours out of the over flow, stops when turned off . any advice please

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Your carburator float valve(s) need to be cleaned or replaced. wear, rust or other particles may be preventing your float valve(s) from closing. take the carbs apart and clean them out. Install an inline fuel filter to prevent the problem after the problem has been repaired.

Posted on Oct 15, 2010


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2 Answers

The petcock valve on the Bigboy TSR 250. What position must the valve handle be when driving. Please explain the 3 positions on the valve.

Is the tap vacuum operated? There will be a pipe from the carb to the tap if there is, and when the engine is running the vacuum from the carb pulls on a diaphragm and opens the flow.
If this is the case, the 3 positions are "PRIME", "MAIN" and "RESERVE".
Disconnect the pipe from the outlet of the tap, but be prepared for fuel to come out. If it does, then the tap is set in the prime position so move it to another setting to stop it. If it doesn't start flowing then the tap is set to main or reserve.
Main and reserve are self explanatory and are standard on most bikes, but prime is not on as many. Never ride on prime as this just allows fuel to flow freely and is only used to start a long standing bike or one that has been run to empty. It does what it says and primes the carb. Once running switch over immediately to main or reserve.

Oct 22, 2015 | Motorcycles


Storing your bike over winter!!!

when your motorcyle has been stood for a while like over winter..keep the battery charged up. if its got them out of petrol befor storeing. has petrol goes off in the carbs & gums them up. whitch then when you come to use the bike you need to strip the carbs & clean the float bowls & clean the jets out..has with a lot of problems i have seen on here when bikes have been stood they wont rev or even start because the petrol carnt get threw...if the bikes been stood a long time you need fresh petrol anyway as it goes off!!...

on Mar 06, 2010 | Motorcycles

1 Answer

On my Yz125 Petrol rapidly flows out of my over flow pipe. As soon I turn on fuel tap. But carb isn't flooding. What was cause this excessive flow.thanks

The float must be sticking, turn the fuel off lie the bike on it's side rattle and tap the carb and try that if it don't work carb needs to be taken off and cleaned

Oct 30, 2014 | Motorcycles

1 Answer

Which way turns the gas on

The tap bit that fits into yr fingers when turning it OFF and ON, should have a longer pointier end and a shorter blunt or more rounded end to it. With the Pointier end "DOWN" or at "6 o'clock" = petrol is ON and bike will run. With the Pointier end "up" or at "12 o'clock" = petrol is now reserve (1 to 3 litres left in tank, depends on the bike make etc) about 3.5 Litres on a VStar1100. With the Pointier end "VERTICAL" or at "9 o'clock" = petrol is OFF and bike will not run, petrol to motor is blocked.

Feb 19, 2012 | 2004 Yamaha TT-R 225

1 Answer

Problem with starting my bike

Sticking floats or worn float valve needles or incorrect float height, tap float bowls to see it overflow stops (sticky float), remove and clean float bowls and fuel inlet passage with carb cleaner and compressed air, check float valve for wear to the rubber tip. Reset float height by slightly bending the metal tab on the float to adjust the closing height of the valve measure from the carb bowl mating surface to the top of the float when fitted then re adjust 1mm at a time higher untill fuel doesnt over flow.

Jan 25, 2012 | 1989 Yamaha FZX 750

2 Answers

When turn on petrol and kick bike, petrol is running out of overflow pipe on carb and bike wont start, and bike sounds flooded.

You have a sticking float in the carburator, due to old gas, or dirt. The float moves a needle that turns on and off the flow of fuel into the carb bowl.

Mar 23, 2011 | 2003 Suzuki RM 125

1 Answer

No fuel coming from tank into carb

1) This might sound daft but check if there is actually fuel in the tank. Many bikes have been stripped down by the hard of thinking only to find the tank was empty...or the tap was off... or should be on reserve... 2) Assuming this is a gravity tap (one main pipe) and not a vacuum tap (one main pipe and one smaller pipe at the side) Turn tap to off and remove pipe from tap. Turn tap on and see if fuel flows. If yes, then replace fuel pipe (this should sort it, try again with the pipe off at the carb end and see if fuel comes out. If it does but the bike still won't start then the carb jets are blocked.), if it still doesn't flow then go to3)
3) If there is fuel in the tank then remove tank and pour it out into a can. Remove tap from tank by unscrewing with the correct spanner. 4) Examine the guaze filter, it is probably full of crud and muck. Clean with fresh petrol and replace.
Hopefully that should sort it.

Mar 04, 2011 | 2001 Sym Husky 125

1 Answer

Fuel coming (sometimes pouring) out of the airbox vent pipe when the engine is turned off. It will also continue for a time with the ignition off and then slow to a stop. But will sometimes start again...

Sounds like needle & seat in carbys could be sticking or float levels maybe to high when you turn your key on your fuel pump starts and this puts pressure on needle & seat and if floats are to high the petrol just keeps flowing Float is what stops petrol flooding the carbies, check minor things first like dirt in needle seat if you have a compressor give carbies a light blow out.

Jan 10, 2010 | Yamaha XJR 1300 SP Motorcycles

1 Answer

I am having a very similar problem (gsxr 750) 1993

It`s means that the crankcase it`s dot fitted propely and the screws are joking.Check!And then tell me.

Aug 25, 2009 | 1997 Suzuki RF 600 R

1 Answer

Exhaust comes realy orange

there is a excess build up of oil in the exhaust, remove the exhaust and pour some petrol inside the exhaust and light it, leave it for around 30 mins to let it burn away the oil. Be VERY careful when lighting as sometimes you get a little flame puff out of bith ends.
please rate this advice.

Feb 27, 2009 | 2003 Yamaha YZ 250 F

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