Question about Honda XR 400R Motorcycles

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I have a Honda XR400 dirt bike and am having trouble starting it, its got compression, spark, have fully stripped an cleaned carbareter, has fuel have tryed crash starting it an it does want to fire any ideas?????

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I have a 2003 XR 400 that I bought in 2005 nearly new (seller was more of an MX guy than trail guy). Thing was HARD to start no matter the conditions; hot day or cold day, sea level or 7000', dry or wet. Once I tired myself out completely and got it running, it would restart ok, but still always a challenge. After months of gritting it out, I followed the advice of everyone online. I bought a pumper carb. Don't even screw around with getting just the right jets, or all the other stuff you've already done. You bolt on the carburetor that the bike should have shipped with and you'll be one or two kicks from a nice run/idle/ride. I ride literally from sea level to 5000' with zero issues. I ride at 7000' no issues. Seriously, It was the best ~$350 I ever spent.

Posted on Dec 11, 2010

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Posted on Jan 02, 2017

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1 Answer

2005 Honda CBF 500 ABS will not start


Hi, Anonymous and the usual suspects are:
1. Fuel tank empty.
2. The fuel tank has old dead gas.
3. Fuel tank bottom contaminated with ethanol sludge, dirt, water, rust, etc.
4. Fuel supply valve/petcock turned off.
5. Fouled spark plugs.
6. Engine flooded as a result of overuse of the choke.
7. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
8. Fuel valve/petcock or filter clogged.
9. Fuel line to carburetor or throttle body pinched, kinked or blocked.
10. Carburetor float stuck.
11. Fuel injectors clogged.
12. Fuel injectors stuck open.
13. Quick disconnect check ball stuck.
14. Compression below 75 PSI.
15. A stuck-bent-burnt valve.
16. Severely discharged or a damaged battery should have 12.5 volts or more and be able to pass a proper "LOAD" test if necessary, you may have a cursory reading of 12.5 volts or more but little or zero amperage the battery is faulty and must be replaced, AGM batteries fail in this scenario more so than lead-acid batteries.
17. Check 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 if necessary.
18. Loose or corroded wire connection at the coil or plug between ignition sensor and ECM module.
19. Spark plug cables in bad condition and shorting check for spark leakage in the dark, cable connections are loose or connected to the wrong cylinders.
20. Ignition timing incorrect due to a faulty ignition coil, ignition module or MAP, CMP, CKP, O2, TPS, ETP, IAC sensors.
21. Faulty neutral, clutch, kickstand safety switch.
22. Faulty fuel pump or fuse or relay.
23. Faulty or corroded run/stop switch.
24. Tilt sensor needs a reset.
25. Security system not disarming alarm needs a reset.
26. Check for engine trouble codes.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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https://www.partsfish.com/page/oem-parts-for-honda
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e

May 20, 2018 | 2005 Honda CBF 500 ABS

2 Answers

My 1988 Honda cbr 1000f keeps backfireing every time i try to start it and wont start


how old is the fuel in the tank ? fuel goes off after 5months !! or it dould be contaminated with water or dirt etc , recomend cleaning the tank and removing the carbs and stripping and cleaning the jets etc !!
has the bike been unused for a long time ?
check that all spark plugs are sparking and check the compressions of each piston ! 100 psi or more is correct for each one , if less then the rings or the valves need investigating !
if you have any more information it will help me !
thanks Paul ...

Apr 15, 2015 | 1988 Honda CBR 1000 F

1 Answer

My CR2004R dirt bike was running but now I cant get it started back it has a blue spark out of the sparkplug and good compression what could it be.


First thing to check is spark if O.K try fuel drain tank clean out carb re-fill with fresh fuel try it again good luck

Oct 13, 2014 | 2004 Honda CR 125 R

1 Answer

Can't start my yz250fp dirt bike


Have a trained tech service and properly jet the carb and set idle and idle mixture.
If you have spark, compression, and the valves are adjusted properly the only thing left is the carb. The FCR carb is as complex as the entire engine!

Apr 04, 2014 | 2003 Yamaha YZ 250 F

1 Answer

1997 rm 125 won't start why should I do?


For your dirt bike to run you need 3 things:

1. Fuel (gas/air)
2. Compression
3. Spark

Start trouble shooting through these. Make sure your gas is turned on, and that it flows through the carb; if you tilt the bike does fuel run through the overflow tube in the carb? Make sure you have good spark; take out the spark plug from the cylinder, still connected to the ignition wire touch the threaded end to somewhere metal on the engine and turn the bike over. You should see a spark. Finally, do you have good compression, how hard is it to kick over etc.

These are the first things to trouble shoot, I would look on youtube if you don't know what you're doing, there are plenty of helpful videos there. You can also try putting a thimble full of fuel into the cylinder and then kick it over to help it start if it has been sitting a while.

Dec 09, 2012 | Motorcycles

1 Answer

I hav a 1995 honda cr 125 it has spark and is getting fuel and wont start but back fires the odd kick, ive replaced ign control, cdi box, rotor and generator, coil and plug


check compression, the valves may need adjustment. also make sure that the carb is clean and that there are no air leaks or you will have trouble. From my experience, 80% of old bike troubles come from the carbs being dirty/clogged. Pull the carb off, disassemble any plastic/rubber parts and BOIL in lemon juice for 20 minutes then rinse and blow out the passages. Reinstall and give it a try. If the valves are out of whack then the piston wont compress the air/fuel mixture and the spark will not ignite the mixture or will ignite it erratically thus getting an occasional backfire. Check valve lash and retry.

Dec 05, 2010 | Honda CR 125 R Motorcycles

2 Answers

1986 Honda CR80 quit running


C A R B U R E T O R .. have a qualified professional take a look at it....

your bike only needs THREE things to run,,(assuming the insides are good),,
1. A timed spark
2. Adequate compression
3. Proper fuel/air ratio

Start with one... eliminate one at a time until you find out which one is NOT happening!! (This is how a professional would trouble shoot your bike)!

Sep 24, 2017 | Honda Motorcycles

1 Answer

2004 Honda XR 400R has not started for a long time


Hi, Jpearson808 if your bike has been sitting idle for weeks, months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will not idle unless the choke is full on and run poorly then stall, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition and in the future pour in a bottle of fuel stabilizer and injector cleaner for you FI folks at least 2 times a year and before storage.
1. If your battery was 2-3 years old when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging the battery remove the leads and let it sit for a couple of hours then check the battery voltage with a voltmeter, you should have 12.5 volts or more, any readings in the 11 volt range you need to do a proper "LOAD" test on the battery and replace as necessary, you may have 12.5 volts or better but little or zero amps, any readings in the 10 volt range you have a dead cell and the battery needs to be replaced.
4. Drain and flush fuel tank if it rusty there is a cheap and easy fix. https://www.youtube.com/watch?v=fUYr_7SwGms
5. Remove and inspect your air cleaner paper elements that are not oil soaked can be cleaned with a soft brush and low pressure compressed air, oil-soaked elements must be replaced. Gause mesh and foam elements can be cleaned by soaking them in a container big enough to completely cover them with a solution of 1 gallon of water and 1 oz. of Dawn dishwashing liquid for small and medium size elements, for monster size double the formula and let soak for at least one hour then rinse with warm water shake off excess and let air dry, "WARNING" do not use compressed air as this will embed micro-sized dirt and road grime and destroy the mesh pattern and stretch foam elements out of shape just squeeze it like a sponge and let air dry, use a fan if you're in a hurry. When completely dry spray a very fine mist of air filter oil evenly around the whole element.
6. Remove the carburetors, disassemble and decontaminate with a "CARB DIP" or if you have EFI remove injectors and clean with carb spray and compressed air
7. Check intake manifold and seals for leaks and craks.
8. Remove fuel valve and filter disassemble and clean as necessary, remove, clean, and inspect fuel and vacuum lines and replace as necessary.
9. Replace spark plugs with new ones and check for spark.
For more information about your issue and valuable "FREE" downloads that you will need for viewing or printing please click on the blue links below. Good luck and have a wonderful day.
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Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/gregg_c0ec1df182c7330e



Dec 23, 2009 | 2004 Honda XR 400R

2 Answers

Motorcycles wont start


Your bike needs 4 things to run-Fuel, Spark, Air and Compression. One or some of these are missing.

1) Crank engine over several times to start. Remove spark plug. If plug is wet and smells like gas then it is getting fuel.

2) Check for spark
Put spark plug back into spark plug cap and lay spark end along side bolt or part of unpainted head making contact and crank over engine as if to start. If no spark then is electrical problem. Try changing spark plug. Check grounds. If not plug or grounds then purchase a shop manual from your local dealer and ohms test all electeical componet resistances as shop manual instructs. Be sure components do not meet specks before purchasing.

3) If has spark and plug was wet upon removal then gas has water or just old gas. If you drained the carb via bottom of carb screw into a clean clear container and see stuff at the bottom then carb is dirty with water and or dirt.

If your bike has been sitting along time condensation will build explaining water and or gas will loose its kick after sitting too long. If you think it has been sitting a long time it is best to dispose of old gas and refill with new. Water can also get into tank from gas can when fully tipped upright so dont dump every last drop into the tank...most ofter the last couple of cups are water.

If bike has been sitting for a few days and was running fine before that, turn off gas, drain carb via bottom of carb screw, close off screw and turn gas back on. This will refresh the gas in carb.

If none of these are the case and you have good fuel, good spark...check air filter for air flow. If all this is good then you need to do a compression check. A simple way to do it is to stick your finger in the spark plug hole and hold it in there with some force and have a friend try to start the bike. If it blows your finger out then it has compression. If it doesnt want to force your finger out then you have no compression and is a piston and ring problem. The only way to test compression for sure it to purchase a compression tester from auto parts store that has an adapter for your size plug hole and do a proper test. I hope this helps.

Apr 08, 2009 | 2002 Honda CR 125 R

1 Answer

Honda 650 2002, starting problem


Hi there and thank you for using FixYa!

Yes this is a common problem with bikes having dirty spark plugs and poor fuel quality. What you do is to remove the plugs, clean it well.. or better, replace it with a new one. Then if it still doesnt start, pull the choke knob for a while. start it.. if it still doesnt start. Open the carbs to check if there are any dirt blocking the jets. Blow the holes with compressed air. Assemble and replace it back. Start. if it still doesnt work, check for the cable, make sure it has current firing to the spark plug.

let me know if this helps..

Mar 23, 2009 | 2001 Honda Vigor FX 650

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