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Compression test the bike will not start spark plug appears to be working carb cleaned but still will not fire at all sky team st 50

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  • helen doyle
    helen doyle Nov 02, 2013

    have replaced piston and rings but compression still low and will not start

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  • Contributor
  • 20 Answers

Take spark plug out poor neat petrol in the hole put plug back in and watch if fire up., then trry and keep it running until fuel from carb gets thru

Posted on Oct 24, 2013

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: baja 90cc atv won't start. Not the Carb.

the valves may need to to adjusted.

Posted on Sep 05, 2010

heimlich
  • 1978 Answers

SOURCE: 2000 honda 1100 shadow spirit. Rough idle, little power.

Replace the spark plug caps and try again. On Honda's the cap is often part of the wire (a dealer part) NGK makes some inexpensive plug caps about $5 each. They should OHM out to 5000 anything above or below and you need to replace them. This should fix the problem.

Posted on May 27, 2010

  • 3 Answers

SOURCE: i have 1974 yamaha dt 250 enduro the bike sat

clean contacts on points with sandpaper (800 grit). located behind flywheel, will gurantee a fix. you can remove the side cover and get to contacts through holes in flywheel without removing it.

Posted on Nov 16, 2009

  • 1 Answer

SOURCE: will not start

Have you checked the coil to make sure it is firing?

Posted on May 26, 2009

  • 3567 Answers

SOURCE: dead pw 50 and sad boy.

Many things could cause the problem. Let me see if I can help out.
You have spark, but is it enough spark? A weak battery can rob power from the coil so only a weak spark is present. Get a new stock NGK spark plug to eliminate the possibility of a problem plug.

It is good that you cleaned the carb because that would be my second target. Reset the air and idle screws. 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. Clean or replace the air filter and be sure the bolts are tight on the carb manifold. INSTALL AN IN-LINE FUEL FILTER. Let the float bowl fill then start the engine. Set the idle speed with the idle screw.

Remove the cylinder head. run the piston down to the bottom of the cylinder. look inside the cylinder. On th carb side (intake) you will see an intake port > a large hole that lets gas into the cylinder. Now look at the exhaust port. It is possible the exhaust port is pretty plugged up with carbon. The intake and exhaust ports should be approximately the same size. Are they? If not then remove the muffler and take a screw driver and plastic hammer and knock the carbon into the cylinder, thus enlarging the exhaust port to its' proper size and allowing the exhaust gases to escape. Vacuum the carbon out of the cylinder. De-carbon the piston top and the cylinder head.

Get back to me and tell me what you find. If more is needed we will go further.

Posted on Apr 12, 2009

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1 Answer

Does a ***** boy 50cc have a reed valve? Bike


Hi first thing what is the bike second thing is the engine a 2 stroke, if it is 2 stroke it most prob. has a reed valve, check that the carb needle valve is working as it should, then drain the cylinder and crank of fuel check the plug sparks, leave the carb off and put a small amount of petrol in it, try and start it if it fires once or twice, then it should start with the carb on it, if not there is a problem with the carb. good luck.

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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

1 Answer

Fully charged battery on my 1996 cb500,choke out however wont fire up just does a little puff like sound


NO - SPARK
Check for spark at spark plug.
1. If no spark, test the wire to the coil with test light and see if you have power to coil.
2.If no power to coil, make sure your on/off button is on and working.Use test light.
A. Power at the switch but not at the coil indicates a broke wire from switch to coil.
B. NO power at the switch indicates ingintion switch is off or faulty and not sending power to your switch , make sure key is on. Use trest light.
3. If you have power to the coil but no spark from the coil - replace the coil

SPARK
Check for spark at the plug
1.If you have spark at the plug, but not starting - check that your carbs are getting gas.
2.Petcock Could be off, Fuel Filter could be clogged, Carbs could be dirty or clogged and your not getting any gas.
3.Pull spark plug - If no gas present then your not getting gas, if wet then you getting gas and your flooded. Make sure you have good gasoline, Bad gas won't burn.
or your bike is worn out and dont have any compression.

With Good gas, and Good Spark, and Good compresssion, the bike will run.

If your not getting gas to your motor through the carbs, pull carb off and thouroughly clean it.

Dec 03, 2010 | 1997 Honda CB 500 S

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

Hi i have a good spark on all cylinders and carbs are all set correctly but as you sit on bike and look down left hand cylinder is not fireing and keeps flooding


Just because a spark plug fires outside the motor doesnt mean its firing under compression. Start by making sure you have new spark plugs. If that doesnt help then do a compression test on all cylinders and compare.

Nov 23, 2009 | 1970 kawasaki Mach III H 1A

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1996 yamaha virago 535. no power on top end,50mph tops-- pulled rear spark plug wire off with eng. running and no effect. looked at spark plug- Black and smelled of gas. Please --- any suggestions??


1 st check compression on that cylinder by taking spark plug off and getting a compression tester and screw into spark plug hole then turn the engine over and if the compression goes over 100psi/7.5 bar then your ring are ok a picture below will demonstrate get back to me if the ring are ok i have more solutions d292560.jpg

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3 Answers

1979 suski 750,bike runs on 2 left side cylinders, 2 right side cylinders are not firing, new plugs, plugs seem to be firing, rebuilt carbs adjusted, raw gas com coming from exhaust pipes on right side....


Hi and welcome to FixYa,

With the indulgence of craigjamesbt...

A few additional ideas to consider:
  • it would be an electrical/ignition issue if 1 & 4 or 2 & 3 will not fire but not 3 & 4;
  • almost always, raw fuel on exhaust indicates a flooded engine. A flooded engine would most likely be a carb issue;
  • best way to determine if it is an engine concern is to do a compression test;
  • a way to test the right carb pair is to deliberately starve them of fuel by temporarily plugging/blocking the inlet port/seat with rubber similar in appearance as to those used for glue gun, not installing the needle and float. Assemble the carb and install. Start the bike and use/spray carb cleaner on the right side carb. Note if 3 & 4 will fire even intermittently.
Would appreciate a postback on results/updates on any developments.

Good luck and thank you for using FixYa.

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