Question about Yamaha WR 400 F Motorcycles

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WR400 - W reg (2000) - has a spark - but not big fat spark - fuel ok - wet plug - loads of compression - new plug fitted still no start friend suggested regulator / rectifier ? Ran fine day before went for 30 mile ride - put in van took to other location out of van ....nothing ! Any ideas ?

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  • Yamaha Master
  • 42,952 Answers

Hi, Intergrateav before testing any electrical component in the Starting System it is "IMPERATIVE" that you have a fully charged battery of 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a preliminary reading of 12.5 volts or more but little or zero amperage, the battery is faulty and must be replaced. AGM type batteries fall into this scenario more so than lead acid batteries.
1. Ignition Switch not in the "ON" position.
2. Engine Run Switch in the "OFF" position.
3. Check the battery terminals for damage or corrosion check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter.
4. Bank angle sensor needs a reset or is faulty.
5. FOB battery low or dead.
6. Faulty ignition switch.
7. Faulty starter button.
8. Faulty kickstand, clutch, neutral safety switch.
9. Security alarm needs a reset.
10. Starter relay, solenoid, starter have failed or circuit wiring faulty.
11. Starter armature or field coils have failed.
12. Main fuse or circuit breaker may be blown or faulty.
13. The electric starter is working but starter clutch has failed.
14. Check for engine trouble codes.
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.
98 WR400 won kick start HELP
What to Do Check When Dirt Bike Won Start
YAMAHA WR400F Owner Service Manual
OEM parts for Yamaha
http://mybikemanuals.com/yamaha/yamaha-wr-owners-manuals

Posted on May 31, 2017

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Posted on Jan 02, 2017

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  • 64 Answers

SOURCE: Honda xr 200 will not spark/fire...

You broke the stator, inspect it for damage.

Posted on Jun 23, 2009

  • 1 Answer

SOURCE: the battery continues to die it will not recharge

it happened to me and it was the light bulb. someone had changed for a super bright blue. make sure there is no non standard electrical equipment on the bike. Also you only get a year to 18months out of a battery for this bike.

Posted on Apr 14, 2010

  • 5370 Answers

SOURCE: vulcan 1500 classic 2000 year

Either the pickup coil is bad (triggers the coils) or maybe the ground is bad .
Or maybe they are both bad at the same time.Also check the ignition switch.Remove the ignition switch wiring harness out.Disconnect the wires, then clean them and reconnect and then check voltage to the wires, if all is perfect, then try to start, it will give spark, if still no spark and coils are new and replaced, then its short in ignition switch issue.Check the ignition switch wires, any of the wire is crimped/pinched and got cut in between or got loose from its connection.--------------Or its a bad ground issue.-------
This should help.Thanks.Helpmech.

Posted on Jun 03, 2011

ahlidap1961
  • 81 Answers

SOURCE: Batteries won't recharge while riding,

hi, you must do 2 types of readings: using a ohmmeter, in DC mode and 20V range, chek the batterie voltage with the engine running (over 1500 rpm).
Then make another reading with your meter set to AC current , juste before your rectifier
The you'll know !! But my opinion goes to the rectifier.
Good luck

Posted on Sep 18, 2011

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1 Answer

Spark plugs getting wet from fuel, compression ok, not starting, timing ok, spark ok, new spark plugs, changed fuel pump in tank,


Check fuel pressure regulator. The actual pressure with a gauge the clean injectors. I'd double check the timing. It also can be the throttle body. Only so many fuel problems the take a good look at the distributor. Small crack or bad wire gives off spark but might not be enough small 4 cylinder for their pecission motors need to be precise check fuses and main busses those are easy and cheap fixes

Jan 01, 2015 | Mitsubishi Cars & Trucks

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Whats the proplem ifthe spark plug is wet with petrol


If the plug is wet with fuel, it is an indication that the plug is not firing properly. Possible causes? Distributor cap, rotor, points/inductive pickup, spark plug wire or the spark plug itself. If you or a friend, relative, etc. has or has access to an inductive pickup timing light, connect the light to a power source and the inductive pickup to the plug wire of the "wet" spark plug. Start the engine and observe if the flash from the timing light is relatively constant in its frequency or is it erratic and sporadic. If the latter is true, check the distributor cap, rotor, distributor points/inductive pickup and plug wire. If the former is true, remove the spark plug and check the compression against other cylinders. If compression is good, replace the spark plug with a new one. If compression is lower than others, the air/fuel mixture in that cylinder is not being compressed engough for combustion, leaving the spark plug "wet". To learn the cause, put a teaspoon of motor oil in the spark plug hole, and recheck compression. If it doesn't increase, you probably have a valve or head gasket problem. If it does rise, you probably have a piston ring problem . Good luck

Oct 04, 2013 | 2006 Chevrolet Aveo

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Car will crank but will not start. New battery and new starter installed. Gas line to carb. has gas and all 4 plugs have spark.


If you have spark, compression, and fuel, it should start.
Have you checked the compression or do you know for sure the timing belt is ok ?
Are the spark plugs wet or dry ?

Jan 08, 2013 | 1988 Ford Festiva

1 Answer

Got fuel and spark but it wont start


If it is the 4 cyl engine, have you checked to see if the timing belt is ok and the engine has compression ?
If it has compression, and the plugs are wet, they could be fuel fouled.
I would try a new set of plugs, check the fuel pressure to make sure it is within spec, and check all plugs for spark.

Dec 08, 2012 | 1998 Ford Ranger

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Bike been laid up for 5yrs....have stripped and cleaned carbs, cleaned fuel tank out. Plugs sparking ok but bike not even attempting to fire.


Have you any compression? If not, pour a few ounces of motoroil in the spark plug hole to place some oil on top of the piston and let it soak for a day or so. Fit an old spark plug and check compression. It should be good now. Turn the engine over a few times to blow the excess oil out and fit a new plug. After checking the petrol and oils is mixing OK and the carb is "wet", try starting again.

Make sure the gear box has fresh oil and any hydraulics have fresh fluid.
Hope you get it going.

Dec 14, 2010 | 2001 Hyosung GV 125 Aquila

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Won't start .is 70# compression enough. Spark and fuel ok. Took off carb and cleaned it. Doesn't even fire with small dose of starting fluid


70psi compression indicates it's rebuild time; the compression should be double that. You can confirm what the compression should be with good rings by putting a few drops of oil in the spark plug hole and testing compression "wet". That figure will be what a new saw would have.

May 20, 2010 | Poulan Pro 42CC 2 Cycle Chainsaw, 18"

1 Answer

1994 camry, won't start. Engine turns over freely, good spark on new plugs, Injectors switching ( tested with light bulb) plugs wet with petrol, checked timing belt, but ok and timing marks line up?


if you have spark and fuel and it is on time it should run if the compression is high enough was this car flooded really bad if so make sure your oil is OK the do a compression check dry and wet you may find when you you do your wet test that it brings the compression up enough to git the car started that would mean that your cylinders were washed out with gas causing the compression to go down

May 03, 2010 | 1994 Toyota Camry

1 Answer

I fitted a new sensor and my bike does not start at all after fitting. Before I fitted the new sensor, I took it to Truimph and they had it on the dianostics and they told me to fit a new sensor.It also...


Thanks for your feedback. When you say "It also smells madly fuel when I start the bike." does the bike start?
I'm going to assume not.
I don't know much about Fuel Injection but there is three things motors need to run - compression, fuel and spark. It sounds like you have compression and fuel, so we need to check for spark.
Chances are the plugs are simply fouled with gas. You can simply buy new plugs (esp if they're old) or check the existing ones for spark.
CHECK FOR SPARK The best way is to remove all of the sparkplugs, re-connect them to their wires, rest the threads against a good ground. Turn the motor over and look for a good fat white spark.
If no spark, make sure all 'safety' switches are in a start position (side stand up, neutral, kill switch on etc.)
Good lcuk & let us know!
Be sure to put a dab of neversieze on the sparkplug threads when re-installing.

Dec 11, 2009 | Triumph Daytona 955i Motorcycles

1 Answer

Intermittent starting


hi if an engine has fuel /compression and a spark it will run you have compression ,you have fuel (wet plug ) so no spark before you buy a coil check the air gap if that is ok then replace coil and it will run hope this helps

Jul 30, 2009 | Campbell Hausfeld Wall Mountable Air...

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Dead front cylinder


3 things to check 1 / check for fuel at cylinder is spark plug wet with fuel if so go to 2 . if not check carbs butterfly / jets etc ?.
2/ compression .. remove spark plug and fit compression tester should attain between 120 t0 150 psi or be in green for none numbered meters .. if not suspect valve seatings or cylinder head gasket ?. or compresion rings . if ok
2 check for spark at plug place plug in cap and place on side of engine turn over and look for good spark ( some plugs spark when out of cylinder but break down under preassure I am sumising you tried a new plug first ) if no spark check ignition /distributor cap and rotor arm clean and refit or replace . if all fails then can only suggest that you take to garage and have a tune test performed .. hope this helps.. Regards vortash

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