Question about 2000 Yamaha FZX 250 Zeal

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Misfire bike came in running bad. removed carbs fully clean reisntalled. bike is misfire bad #4. Gets the right spark rhythm when you spray starting fluid over #4 runs fine. could this be a bad valve or A severe vacuum link im hoping its common and you guys will know

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Sounds like a bad valve to me.... have you checked the compression? that would be the first step.

Posted on Nov 10, 2008

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On this cart, I have cleaned out carb twice. Battery good. It runs shortly then dies out. Micro switchesx4 has been replaced. Spark plug good. Gas is good and getting to carb.


Determine if it is running out of fuel or no spark.
If it stalls but will run on carb spray or starting fluid
sprayed in carb opening then the fuel has problems.
If it will not run on the starting fluid then the spark is weak
or failing due to bad wiring or coils. Once you isolate
the problem to fuel or spark then you can probe those areas.
Be sure compression is good also. 100 psi at least.

Mar 09, 2015 | GAS Motorcycles

1 Answer

Bike not starting at all. sometimes it starts after continous kicks but no use .agian the same problem.


I would suggest that you cleanyour carburetors.
To tell if they need cleaned, spray carb clean in the back of the carb and the kick it over, if it starts right up, then you need to clean your carbs., Drain your gas tank and install a new fuel filter, and put new gas in the tank too.

If it doesn't start right up on the carb cleaner, then check to see if you are getting spark.
If you have spark, then test your compression.
Compression should be at least 125-145 psi but not less than 100 psi to run.

If you don't have spark, pull power wire off coil and see if you have power to the coil.
If you do have power then your coil is bad.
if you don't have power, make sure your on/off switch is working. check wires

As long as you have good compression, good fuel and good spark, that motor will start.

Pull out the plugs and see if they are dry, or wet or , black and sooty.
If dry - no fuel
if wet - no fire or misfire
if black and sooty - clean & check gap or replace with new ones.

Nov 30, 2010 | 2006 Hero Honda Passion Plus

1 Answer

1980 Yamaha XS 400 Special First, How do you tell if it has an electronic ignition? Second, Can't get it to start. Have put gas in spark plug holes. Didn't hit. Bike has been setting on a dirt...


First, you need a good battery. The bike does have electronic ignition. Soak the carbs in denatured alcohol for two hours after removing the float bowls, then clean with spray cleaner. Spray into every large and small hole you can find. Remove the rubber diaphragm from the center of carb prior to cleaning. New diaphragms are $196 each. Check all fuses. Put in new spark plugs, NGK-BP7ES. Clean the air filter. Get a can of spray starter fluid and spray on the air filter. The rubber mounts for the carbs are likely to be a problem once it gets running. It looks like they are still available at Babbitt's, $53 each. If un-carburetored air can get into the joints it will lean the fuel mix and cause uncontrollable high idle.

Before you sink a lot of money into the bike, check for spark. If spark is present, coast the bike down a good sized hill without any spark plugs being installed. Put the bike in 3rd gear as you go downhill then let the clutch out to turn the engine over. Now ( using the clutch lever ), shift through all the gears then neutral. If the bike will not shift properly it likely has a bent shift fork. I can't find any forks avaiable. With a bad tranny I would put it back in the dirt floor building and find a newer bike. Here is a link to Babbitt's. Please rate my answer. Thanks.
www.babbittsonline.com/pages/parts/viewbybrand/default.aspx

Aug 13, 2010 | 1980 Yamaha XS 400 Special

1 Answer

After cleaning the carb it backfires in the carb and exhaust now. I use started fluid to test bike to c if i got it running right.before i clean carb it running ok with starter fluid be spray in carb. but...


How did you celan the carbs?? Need to strip and dismantle all parts / blow out with compressed air / Check float adjustment etc./ reassemble, ensure there are no air leaks.

Mar 17, 2010 | 1996 Suzuki RF 600 R

2 Answers

2003 Yumbo Dakar Motorcycle -only 527 miles - will not start!!!


  • Nice looking bike. Yumbo Dakar is not a bike I have ever worked on but I will try to help.Remove the air filter and look into the carb as you twist the throttle. Does the slide open and close as it should? Open the slide and spray starter fluid into the carb bore as the electric starter is used. Not starting? NEXT >
  • Drain the carb just to see that it is filling with gas.
  • Remove the flywheel cover and put a timing light on the bike. Use the starter button and see if the timing marks are on. The CDI could be bad or the cam chain could have jumped.
  • Remove the cylinder head cover. Turn the flywheel to TDC compression. Look at the OHC gear. There should be two marks positioned parallel with the head surface, (or an '0' at the top of the gear and in line with the centerline of the crankshaft). Are the valves in time?
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Aug 14, 2009 | 2004 Yumbo Dakar 200

1 Answer

Engine shuts down while still bike is running. and low thrust from the engine. is it clutch problem or engine problem ??


It is not likely to be a clutch problem if pulling in the clutch lever fully dis-engages the engine. If the bike wants to pull forward in first gear even though the clutch is pulled in all the way, then the clutch is not fully dis-engaged. Adjust the clutch cable. If the clutch is working properly then there is an engine problem.

If an engine problem, start by draining the carburetor. There should be a screw on the lower side or bottom 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 idle screw and the air screw 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 adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster 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.

Aug 09, 2009 | 2008 Yamaha Gladiator SS

1 Answer

I have a kawasaki 125 dirt bike it gets fule and sparkes but will not run pull started it and sat and kicked for hours what could be wrong


Bottom line is it needs some attention. Remove the tank and flush out the rust, water and any trash in it. Remove the fuel valve assembly from the tank and clean the wire mesh filter screen. Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then thoroughly clean and 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 idle screw and the air screw 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 adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster 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 top rate this answer.

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Jun 28, 2009 | 1976 kawasaki KE 125

1 Answer

Bike won't start


Check compression ratio and valves clearance.The carbs leak any fuel from their o-rings.Spray through the air box with a carb cleaner spray while pressing start button but little bit at a time.Don't twist the throttle too much and always use choke until she fires up for good.

Jun 03, 2009 | 1996 Honda CBR 600 F(3)T

1 Answer

Loss of power


This sounds like some water in the gas.
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. Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there 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 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 into all the little airways and fittings in the CARB. Remove the idle screw and the air screw 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!

Apr 17, 2009 | 2001 Yamaha XVS 125 Dragster

1 Answer

Dt 125lc 1987 back misfires and does not pick up on acceleration


I am going to have you do a series of things to clear up the problem. First come the basics >

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 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. Don't be cheap, use a lot of cleaner. 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 and dry the air filter and install the carb. 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 unless other problems exist.
Let's say that the bike is no better >
  • How good is your battery?
  • Carb, head, intake manifold and carb mounted tight?
  • Does the carb intake manifold have reeds? What condition are they in?
  • Remove the flywheel cover. Take hold of the flywheel and, without turning the wheel, lift the flywheel up and down then left and right. Any movement or was the flywheel rock solid? If movement then the crank bearings need replaced along with the crank seals.
  • Speaking of crank seals, how old are your seals? The bike ain't gonna run with bad seals.
  • I don't recall for sure, does the bike have CDI? If so, have the dealer test the CDI and the coil.
  • If no CDI, when was the last time the points and condenser were replaced or points filed and set? Get the coil checked.
  • How old are the piston and rings? You could have problems there. What shape is the cylinder wall in? Scared up, low spots (you will not see the low spots without running a cylinder hone through the bore).

There isn't much more to do. You just rebuilt the engine.
Please rate this solution. Thanks!

Apr 02, 2009 | 2004 Yamaha DT 125 R

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