Question about 2003 Honda Xr 250

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I have a honda xr 250 2002 that will not start. It has good spark, valves are are all adjusted correctly, compression is fine, and fuel is making it to the plug. I am having issues with fuel flowing out from carb drain tube. I did change the float and needle. Will not kick over or bump start.

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Kicking over is the action of moving the engine with the kick-starter. I will presume it kicks over but does not fire at all.

It really sounds like flooding.

Drain the carb, and disable fuel delivery. If the shutoffs are vacuum operated pull that line and put a golf tee in it. If manual, turn to off.

Remove the plug, and turn the engine over enough to be sure the insides are dry.

Out the plug back in, and give it a shot of starer fluid (careful with that stuff!), and try to start it. If it shows some signs of life, then you almost certainly are flooding.

Use a syringe to put a dose of fuel in the carb through the float chamber vent. Make sure it is not too much. Again, give it a little shot of starter fluid, and see if it will start and run sustained a little as it feeds on the gas you put into the carb. If it will, your float and needle change either was done incorrectly, or the float height was not adjusted right.

Posted on Jul 07, 2010

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93 Honda Civic dx will not start. new fuel pump igniter, has spark


sorry if you guess and guess wrong. really, must be expensive.



ok got spark (and timing is good, timing light test)

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then engine is bad, compression is checked, see near 80 not 150+ PSI , the timing belt has slipped. if not changed by the book

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cant burn fuel with no compression and spark. well with EFI it cant run right with bent valves either.



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Hi, Anonymous and the usual suspects are:
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
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4. 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.
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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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12. Ignition is not functioning properly (possible sensor failure).
13. Faulty ignition coil.
14. Valves sticking.
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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Hi, Andrew and the usual suspects are:
1. Spark plugs in bad condition or have an improper gap or are partially fouled.
2. Spark plug cables in bad condition.
3. Battery damaged or nearly discharged, should have 12.5 volts.
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5. Throttle controls not adjusted correctly.
6. Water or dirt in the fuel system.
7. Water or dirt in the carburetor.
8. Intake air leak.
9. Fuel tank vent hose and vapor valve plugged, or fuel line closed off, restricting fuel flow.
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11. Engine lubricant to heavy (winter operation).
12. Ignition is not functioning properly (possible sensor failure).
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1 Answer

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By "all timing marks seem to be right", are you talking about the timing marks on the alternator rotor or the camshaft timing marks? A 1985 model is a pretty old bike. If it has never had a timing chain or the adjuster guides replaced, you may need to address this issue. Not only do you need for the ignition timing to be correct, you need the camshaft timing to be correct as well.

In your problem line, you stated that you had fuel, and spark. You need three things to get any engine to run, fuel, spark, and compression. Do a compression check on the engine. If the compression is low, it won't start either. Three things can cause low compression. Bad rings, improper camshaft timing, and valves not seating properly.

If you want to get the bike running again, I would suggest you do a "top end job" on the engine. Pull the head and cylinder. Measure the cylinder for wear and bore for a new piston if necessary. Replace the rings. Have a valve job done on the head at a local machine shop. When you put it back together, do so using a new timing chain and adjuster slides. You'll be surprised at what a "New" engine feels like. Good Luck!

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1 Answer

The bike wont start! seems to have good compression, and fire. the timimg mark is lining up at tdc but with a shot of starting fluid i have gotten a flame thru the carb! oh, and the valves have been...


If your XR600 has ever sat for more than just a few months, there's a very good chance that the carburetor is plugged with fuel varnish. This means that the carb will have to be disassembled and cleaned.
A big four cycle engine like your's may "feel" like it has good compression, but it may not have what it takes to start and run. Check the compression. With the throttle wide open and a few good kicks of the starter, you've got to see at least 140 psi of compression. Anything below that and it isn't going to start or run reliably. If the compression is low, the first thing to do is re-check the valve tappet clearances. Insufficient tappet clearance will cause low compression. Also make sure the kickstart-actuated compression release is not hanging up and causing compression loss after the kick start lever is returned to its parked position. If the valves are properly adjusted and the compression is still low, then internal engine repairs are needed.

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2 Answers

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