Question about 2002 Yamaha TT-R 125

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HARLEY DAVIDSON 125TX WILL NOT START

HARLEY DAVIDSON 125TX .SPARK PLUG FIRES, CARB HAS BEEN REBUILT .STARTED ONE TIME LOTS OF SMOKE WOULD NOT STAY RUNNING AFTER SEVERAL KICK STARTS AGAIN RAN A FEW SECONDS MORE WHITE SMOKE.
COMPRESSION GOOD .HELP

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Replace plugs also on carb there will be a mixture screw the person probably adjusted this you need to turn this out and see if it improves 1/2 a turn if not screw it in 1 turn if still no difference fiddle with it also replace/clean air filter this may help good luck bud HARLEY DAVIDSON 125TX WILL NOT START - df7e911.jpg

Posted on Sep 09, 2009

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Posted on Jan 02, 2017

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I have a 2003 Harley Davidson 1200 sportster,


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If carb looks like an leak at the Oring manifold .Try to start and spray any carb cleaner to the manifold close to the cylinder ,.any change on idle would be an air leak!

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2001 1200 sportster cranks and backfires, carb and fuel good, could it be crank sensor?


Wasted spark system. If fuel and electrical is all good/correct it is often the case in these symptoms that motor cycle spark plugs that although looking good and firing outside of the engine are breaking down and will not fire under compression pressures on a power stroke but will fire unburned fuel on the unpressurized exhaust stroke when the plug again fires in a wasted spark ignition system and when so firing the result is a backfire, usually quite loud.

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1999 harley davidson softail standard won't start back fires


You have a wasted spark system and you are getting fuel. Probably you need new spark plugs as even if the old ones look good and might spark out of the engine it appears they will not spark properly under compression pressures and the fuel that remains unburned is ignited when the spark plug fires on the exhaust stroke when there is not pressure and therfore teh backfires.

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98 harley fatboy turns over but wont start


some after market ignitions don't spark on the first couple of turns but first take off your air cleaner twist the throttle and look to see if gas is spraying in the carb if not give it a little starting fluid if it fires but then dies then its carb issue. now other thing to check is if you have three posts on your coil then its single fire and your plug wires might be going to the wrong spot switch um around.

May 09, 2014 | Harley Davidson FLSTF Fat boy Motorcycles

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Back fires and blows carb out of manifold


Hi Anonymous, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
For a prime suspect please visit website below and good luck:
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

Nov 14, 2013 | 2003 Harley Davidson FLSTS Heritage...

1 Answer

Harley softail back fires and on start up runs rough


Hi Anonymous, and the usual suspects are:
1. Spark plugs in bad condition or partially fouled.
2. Spark plug cables in bad condition or leaking.
3. Spark plug gap to close or to wide.
4. Faulty ignition coil, module and or sensor.
5. Battery nearly discharged.
6. Damaged wire or loose connections at battery terminals,
ignition coil, or plug between ignition sensor and module.
7. Intermittent short circuit due to damaged wire insulation.
8. Water or dirt in fuel system, carburetor or filter.
9. Fuel tank vent system plugged or carburetor vent line closed off.
10. Carburetor controls misadjusted.
11. Damaged carburetor.
12. Loose or dirty ignition module connector at crankcase.
13. Faulty MAP, CKP, and or CMP sensors.
14. Incorrect valve timing.
15. Weak or broken valve springs.
16. Damage intake or exhaust vale.
For a prime suspect please visit website below and good luck:
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

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1 Answer

I have 2003 roadking ,it has 15204 miles and it will not start. i checked the spark plugs and there is spark ,put not wet with gas. used starting fluid and it did start for 5 sec. had the carb rebuilt in...


If it started with starting fluid, it sounds like a fuel delivery problem.
start from the tank and work your way down.
check pet ****, fuel filter, and carb.

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1 Answer

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Start by narrowing it down to fire or fuel problem. Pull a sparkplug, ground it to the head, and crank the engine. If there is no spark, then test the plug wires, coil, then ignition module in order down the line until you find where the power stops. If you have spark, then check the petcock to carb for fuel. If there is no fuel from the petcock, then it will be the petcock filter or the petcock is bad. If you do have fuel to the carb, but no to the cylinders, then the carb may need to be cleaned and/or rebuilt. Try these and let me know.

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2 Answers

Older harley


at what throttle position? check basics first , spark plugs air filter fuel filter and plug wires

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