Question about Yamaha XS 650 F Motorcycles

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Gas leaking thru carb on my 1978 Yamaha SX Special. Bike will start but gas leaks as soon as it is put in the tank. Where do I start looking for the leak.

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If the carb is leaking fuel and the leak is not at the hose fitting,

  • Either the float needle is missing
  • The float is not free on the hinge pin
  • The needle is being held open by trash
  • The float level is set wrong
  • The float is bad and is filled with fuel
The float should be light as a feather and with only air inside it. Please rate my answer. Thanks.

Posted on Aug 30, 2010

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I was riding my bike and came to a stop it shut down and started to leak gas out the air intake now it will not start. What do I need to check to fix this issue


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1 Answer

Yamaha 1978 750 Special Fuel Leaking Problem


These type of fuel shut offs do not have a manual off position. They are automatically operated by engine vaccuum when working properly. They have malfunctioned and allowed fuel to overflow into the airfilter box(the black box) untill repair time use a long piece of hose to connect the large outlet of each shutoff to eachother or plug the end of two short pieces. The carbs have a drain screw on the very bottom of each facing left , right or straight down. you could also drain the carbs however once the fuel supply is cut to them they should not leak any further. Leave the carb fuel hoses from the tank disconnected. You should drain the tank by siphon and the residual gas that is already in the air box can be drained from the hose on the bottom of the box. This is a mess but once you get all this drained it should stop leaking

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1 Answer

Bike spits and sputters at top end


Hi, Johnny and the usual suspects are:
1. Inlet system air leak.
2. Enrichener valve not seated or leaking.
3. Damaged or restricted fuel tank vent system.
4. Restricted fuel supply tract.
5. Dirty or damaged air cleaner element.
6. Plugged bowl vent or overflow.
7. Worn or damaged needle or needle jet.
8. Vacuum piston assembly malfunction.
9. Loose or plugged main jets or passages.
10. Improper float level.
11. Accelerator pumps inoperative.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have nice a day.
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YAMAHA YZ250 LC Owner Service Manual
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1 Answer

Yamaha vino 125 scooter leaks gas when i try to start it


carb will need cleaning as it sounds like you've got a stuck float valve...it only leaks when you try to start it as the fuel tap only flows when the engine is turning over.
When leaving a bike stood for a while with an empty tank you should put an oily rag into it to prevent rusting...although the correct method is to fill the tank right to the top and add fuel stabiliser.

Nov 20, 2012 | 2009 Yamaha Vino 125

1 Answer

I have a 2000 yamaha R1 and when i stared it up it leak gas i don't know much about bike what can i do


First you can look see if any fuel lines have become perrished or simply fallen off, lift up the tank and start up the bike the fuel tap is located at the rear of the tank and can be turned to off position. Try locate where the fuel is leaking, if it is coming fro. The carb breather tubes, or the overflow at the bottom of the carb float bowls if you are not up to scratch with the job you may want to employ someone to remove the carbs for you for cleaning-servicing

Sep 18, 2011 | 2000 Yamaha YZF-R1

2 Answers

My bike was starting hard in fact the last few


The reason it might be leaking through the overflow hose is probably because one of your floats are stuck. Reason it might be hard to start is because you might need a new spark plug or carb cleaned.

Jul 29, 2010 | 1980 Yamaha XS 400 Special

2 Answers

Won't idle without choke


The pilot jet controls the air/gas fuel mix at idle . If the jet gets plugged up not enough gas gets to the emgine at idle. You will need to remove the carbs and float bowls and clean them, paying special attention to the pilot valve. Count the number of turns to remove the pilot screw and replace the same number of turns then turn counter clockwise 1/2 turn.

A “very helpful” rating for this answer? Thanks!

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Jun 30, 2009 | 1993 Yamaha XV 535 Virago DX

1 Answer

Fuel leaking from bowls on Carb


is the leak coming from the overflow or just the seal around the bowls? if you take the bowls off (turn petrol off first) the floats may be getting caught open?

Jun 06, 2009 | 1978 Suzuki GS 750 E

1 Answer

Gas leak


so you have a hole in your tank somewhere. or leaky fuel **** gasket. firstly you need to find the leak. or is your gas just flowing right thru your carbs and out the overflow? shut off fuel to eliminate carbs. if it stops leaking then its probably gummed up carb floats. use Berrymans B12 fuel additive this will work into the carb and hopefully break down the gum. or strip and clean them by hand with a good spray carb cleaner. or remove air cleaner and spray directly into carb and let sit for a few days.
if it's a gas tank leak then you will have to get it lined, (liquid sealer) so long as the hole is not too big. if it is then drain and dry the tank, get it welded professionally or patch it with a filler or fiberglass and then get it sealed, i used my local radiator repair shop to het mine done.

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1 Answer

2000 Yamaha R6 leaking gas - coming out of winter storage. Ran perfect when put away. It seems that gas is leaking from upper half of the bike - the tank is extremely full of gas at this point. Any...


this is a carb model yes? if you stored bike with fuel tap on then it could be your carb floats stuck. there is nowhere on the engine itself that gas would be going. is it dripping from the tank? fuel petcock? fuel pump (probably under the tank) ethanol in gas can completely screw up pumps.

if it's a carb problem shut off gas, remove aircleaner let fuel in carbs evaporate for a week. get some Berrymans B12 spray carb cleaner and get a bunch of it in there, it will break down the gum/varnish from the gas. also get Berrymans B12 fuel additive and put some in the tank. re-assemble and see how it goes.

Mar 30, 2009 | 2000 Yamaha YZF-R6

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