Question about 2003 Yamaha WR 250 F

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Bike will not run...carb is clean, electrical is working, checked spark plug....

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1 does it have compression? 2 check your valves. 3 is it getting fuel?

Posted on Oct 18, 2010

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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

Bike starts onley running on back cyl. front one cold has spark on both and comp about the same ,wandering about front carb any ideas


check to see if your front spark plug is wet when you run the bike. If it is then your spark might not be strong enough. this could be a bad coil or ignitor. If your plug does'nt get wet then clean and rebuild your front carb. check to make sure your itntake manifold is not cracked or dry rotted and causing a vacum leak.

Aug 08, 2010 | 2002 Suzuki VS 800 Intruder

4 Answers

My 1974 Yamaha 250 Enduro wont start I have cleaned and redone the carb. I have changed the coil pack and spark plug. Any suggestions will help Im not a mechanic by any means so not sure where to start...


you need good compression ( at least 90 psi , kicking it with the throttle open) , good crankshaft seals for sucking the fuel/air into the botton end, proper point gap and timing set for spark ( spark should be big and fat,if not the source coil is weak,, this is a flywheel magnito ignition and it needs no battery to fire the plug) if you clean the carb, make sure you also clean the choke pickup tube or it wont choke. also make sure you have the slide installed in the right direction ( not backwards and the idle is not set too high at first...compression/****-good spark at the right time-proper fuel/air ratio and it will run

Jul 04, 2010 | 1974 Yamaha DT 360

2 Answers

I put diesel fuel in my bike. I have drained the fuel from the gas tank and put gasoline in but it will not start. It turns over but no start. I have not replaced the spark plugs. What should I do?


Its recommended you use a fuel cleaner and run it through the fuel pipes and clean out the carburettor otherwise it will still be sucking through some un-emptied diesel, Also take spark plug out and kick bike a few times or electric start for a bit so it spews out the diesel left on top of piston.

Jun 21, 2010 | 2001 Honda CMX 250 Rebel

1 Answer

HI My bike is not starting what could be a problem?


When a bike won't start, if it was running well last time you rode, there are three things to check spark, gas and air. First make sure you have a spark to plugs, also remove plugs and check that they are clean and not worn. Second check that fuel line is on and clear, drain carb bowls to get bad gas and water out. Third check that air filter is clean. If it still won't start and air and spark are good, go back and make sure carb jets are moving freely.

Please rate this answer for me. Thank you

Mar 26, 2010 | 1999 Suzuki RF 400 R

1 Answer

Bike seems as if its running on 2 cyclinders


r all the mufflers the same heat--make sure carbs r ok n gas is gitten to um--inspec plug wires n the rest of ign for wear and bad contacts--with an ohmeter n repair manual varius test can be done-sayonnara

Feb 02, 2010 | 1985 Honda CB 700 SC Nighthawk

1 Answer

Bike wont idle unless the choke is on.


Try cleaning pilot jets on carb or carbs. Also check for vaccume leaks like hose off of carb or bad carb boots.Spray carb cleaner around boots with bike running but be careful not to get it near exhaust or spark plug.

Dec 26, 2009 | 2000 Suzuki GSX-R 600

1 Answer

I have cleaned the carb and spark plug it is still not running


try squirting a tad off fuel in the inlet on the carb and see if it runs for a second and get back to me with results

Nov 02, 2009 | kawasaki KMX 125 Motorcycles

1 Answer

Bike has sat up for a year or so,wont start,cranks fine,has spark,maybe bad fuel ?


If no fuel stabilizer was added while the bike sat for a year or so.
It is most likely bad fuel with gum deposits.
This can can create some problematic symptoms for you.

It is vital the bad fuel to be cleared from tank/lines and carbs.
You may need the fuel system cleaned as the gum deposits can cause major headaches in the carbs and jets. If the system is not cleaned and even after you get the bike running, you could be miles away and have the fuel fowl jets/injectors, causing shut down.

Check the spark plugs carefully. Oil on the plugs may just need cleaning. Once you get the bike running the oil should burn off if the rings are still in good shape.

Motor needs clean Air, Clean Gas and a hot spark.

Good luck!

Oct 04, 2009 | 1995 Yamaha XV 535 Virago DX

2 Answers

Is it Possible Tha Carburator Dirty Could cause The bike no Star


Yes, a dirty Carburetor can stop the engine from running.

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. Is there any water in the gas? 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. 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.

FOR NO SPARK > Check the fuses. Next, check for spark but with a new spark plug. How good is the battery? Is the kill switch on? Does the side stand have a kill switch? Is it working properly? Tip-over kill switch on your bike? Check the operation of the ignition switch and all kill switches with a volt ohmmeter.

Check the wiring harness. Did a wire come unplugged? Are all wires clean and with solid connections? Any abraded or pinched wires? Is the bike in neutral and the neutral light is lit up? If no neutral light, check the neutral switch and neutral switch wire on center casing. If still no spark, get CDI system and coils checked at the dealers shop.

Please rate this answer. Thanks

Apr 14, 2009 | 1996 Suzuki GSX-R 750 T

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