Question about Yamaha YZ 250 Motorcycles

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1989 YZ250 wasn't getting gas to the cylinder. Removed bottom of the carb and blew it out. Put back together and when turning on the gas, gas pours out of lines?

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  • Yamaha Master
  • 43,838 Answers

Hi, Mat and the usual suspects are:
1. Damaged or restricted fuel tank venting system.
2. Loose float bowl screws.
3. Damaged float bowl o-ring.
4. improper fuel level in the float bowl.
5. Worn or dirty inlet valve or seat.
6. Damaged or leaking float assembly.
7. Particle contamination in inlet fitting cavity.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day.
http://www.proride.com/smfforum/index.php?topic=70358.0
Carburetor Carb Leaking Gas How to Fix Repair it Motorcycle Honda DIY...
Yamaha YZ250 Owner Service Manual
OEM parts for Yamaha
Yamaha yz250 2015 Owner Manual

Posted on May 01, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: gas not getting to carb. Blew out all lines gas, new gas filter

fuel line cracked in shroud just fixed one just like it check fuel line from filter to carb

Posted on Apr 08, 2009

bulldogchief
  • 388 Answers

SOURCE: Blower will not start, will not fire

Doubtful. Clean the bolts and re-mount but I doubt that'll fix your problem. Check spark with an in-line spark checker. Be sure you have the right oil/gas mix...or you will burn it up. How did you check compression, what is the reading? Anything less than 100 means the piston ring is stuck.

Posted on Sep 05, 2009

  • 143 Answers

SOURCE: Troy Bilt Chipper/Vac 47282

There is a blockage in the outlet from the fuel tank, there is a filter in the tank and it is dirty. Try it anyway. Stephen.

Posted on Sep 21, 2009

ollie reece
  • 1167 Answers

SOURCE: i have a 1991 yamaha yz 250 it starts then shuts off

change the pkug first buy a br8eg plug off ebay and see how this goes get back to me also are you using the choke on start up

Posted on Sep 29, 2009

  • 10 Answers

SOURCE: rear cylinder carb on 85 xv700 virago wont accept gas

The float needle valve has probably stuck in the closed position, probably caused by fuel gum. Worst case scenario is to take the carb off and clean it. Easiest scenario is to remove the fuel line and squirt carb cleaner into the valve area. Leave it overnight. Sometimes carb cleaner and tapping the carb will move it. Low pressure air can help. Once it's clear add some injector / carb cleaner to a tank of fresh fuel ( double or tripple the normal doseage won't hurt.)

Posted on Mar 23, 2010

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1 Answer

Gas leak threw bottom of carb and building up in cylinder


Pinch the fuel line then take the carb bowl off then reopen the gas line and press the floats upward and see for yourself if they are shutting off the flow.

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I justgot a 95 kawasaki 500. i just cleaned the carbs and put in a fuel filter. i put bike back together. there is a black tube running out the back of the bike starting from after the carberatuor an


Its probably the crankcase vent. The carbs have more than likely been pouring gas inside the motor,to the point of overfilling the crankcase oil with gasoline. Drain the oil and change the filter. And while youre draing it,..look inside the carb bodies,and see if gas is still running into the cylinders.If it is,then your float height is not set correctly..(too high)...or the needle valves need to be replaced. (valve that hooks onto the floats).

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1 Answer

Gas pouring out bottom of carb won't ping out


Hi and welcome to FixYa,

Gas pouring out is an overflow. The only reason there would be an overflow is when the float activated valve does not close the fuel inlet port. This could be caused by dirt, sand, rust or any foreign material. Fix would call for a carb pulldown, soaking non-rubber parts, and cleaning.

Good luck and thank you for asking FixYa.

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Sounds like you have a float problem their is a needle and seat the lets gas into bowl of carburetor if its bad it will not stop letting fuel in the carburetor causing your problem (Be sure to change oil before ing engine over or you could damage engine (with this problem you get gas into case which will remove oil from engine parts inside !

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1 Answer

Wondering what the carb settings are for a 1983 yz250 my plug is fouling, i just put in a new one and it still fouled, its wet when i take it out, too much gas maybe? the bike smokes alot when i start it,...


The header says it is a 2004 YZ250F. That's a four stroke and gets no oil in the gas. Your 83 model is a two stroke. As far as the oil and gas mix, 32/1 is the proper mix. That's 4 ounces of two stroke oil per gallon of gas.
DO NOT USE STANDARD MOTOR OIL IN THE GAS.

Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Be sure the bolts are tight. Let the float bowl fill then start the engine. Set the idle speed with the idle screw. This process should get you back on the road.


Please rate this solution. Thanks macnevind!

Apr 04, 2009 | 2004 Yamaha YZ 250 F

1 Answer

Poulan 18' model 2000 chain saw, quit running , will not start.


If you have a compression gauge, check the compression. Anything under 90psi is too low.

Check your flywheel key. If it is broken the flywheel will move and not fire at the correct time.

Note: if it does not sputter with carb cleaner then it's not your carb.

Next:
Remove your exhaust manifold. Look into the cylinder with a flash light. You are looking for scratches. Anything larger then a light fingernail is definite proof you need a new cylinder/piston assy.

If it passes that test do the following:

Pour mixed fuel straight into your cylinder until 1/4 full. Slowly pull your saw over while looking into the cylinder. If you see bubbles after the ring/rings go by then you need a new cylinder/piston assy. On rare occasions if no scratches are present on the cylinder wall or piston, you may be able to change just the rings.

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1 Answer

NO SPARK TO REAR CYLINDER


Troy, the problem is probably not a lack of spark. More likely it is a lack of fuel in that rear CARB. Do what is shown and you will probably be back on the road in a few hours.

Drain the carburetors. There should be a screw on the lower side of each CARB float bowl. Remove the screw then replace it after the fuel drains. Any water in the gas? Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ). Install new stock NGK spark plugs. Remove the carburetors from the engine.

FOR EACH CARB > Remove the float bowl and clean the entire
CARB with a spray CARB cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the CARB. Remove the two screws on the outside throat of the CARB and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the
CARB back together, clean the air filter and install the CARB. Balance and sync the carbs.

This process should get you back on the road.


Please rate this solution. Thanks!

Mar 29, 2009 | 2003 Yamaha V Star 1100 Classic

2 Answers

My zx10b keeps stopping after riding a few miles after a while it starts again only to stop again


Drain the carburetors. There should be a screw on the lower side of each carb float bowl. Remove the screw then replace it after the fuel drains. Any water in the gas? Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ). Turn the gas back on and wait a minute for the carbs to fill with gas. Install a new stock NGK spark plugs and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetors from the engine.

FOR EACH CARB > Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.


Please rate this solution. Thanks!

Mar 29, 2009 | 1989 kawasaki ZX 10

1 Answer

Carb help


I'm new to the site and new to carbs. I bought a bike last week that had been sitting in a barn for a couple years the engine hadn't been running in over a year. I was able to get it running the first day after cleaning out the field mouse home occupying the air filter chamber and swapping the old gas for new gas. The bike ran and idled fine but the left carb (dual carb setup Keihin) poured gas from the tube coming out the bottom. I did some research and found out the floats may be stuck. I went ahead and ordered new floats and float bowl gaskets. I took the carbs apart apart as much as I could, using Berryman parts cleaner to soak all the metal parts I could get off. I put everything back together and put the new floats in yesterday. I started the engine and not only is the gas is still pouring out the bottom of the left carb, but now the bike is idleing very fast. The idle adjustment is backed out completely. When putting the carbs back together, I screwed all the jets back in all the way. I screwed in the Pilot Air screw, the one with the spring, all the way in, then backed it out 1 1/2 turns. Not sure if this has anything to do with the idle. As far as the floats go, does it sound like I need to replace the float valves too? ,The seats on the jets, or the o-rings on the needle valves that the floats control are probably leaking.,,,

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