Question about Harley Davidson Harley-davidson Motocyclette Hardwood Motorcycle

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I have a 1987 fxr, engine misses and backfires can't get the timing lined up , I tried cleaning out the carb. changed coil,plugs,ignition module,vacuam electronic switch then I found one stuck tapplet I replaced all of them and all the push rods and still have the same problom, can you help me, thanks Joe

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This will sound too simple but could you have your plug wires reversed? not sure what you mean by cant get the timeing "lined up" do you have the book out

Posted on Jan 03, 2010

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Intake leak?

Posted on Aug 17, 2009

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1 Answer

Yamaha Grizzly 600 backfires and doesn't want to idle


Did you line up the stator plate line with the notch on the cases? Sounds like your ignition timing is set a bit retarded. I would pull the side cover off and check the timing marks.

Sep 27, 2016 | Yamaha Motorcycles

1 Answer

I have a 05' brute force. It starts and idles great but when i drive it misses out and when i let off the gas it backfires. Any ideas why? I have cleaned the carbs and changed spark plugs


Do you have a multi-meter and can check your cdi? The cdi is known as an igniter. It's what actually sends the signal to the ignition coil to fire down to the plug. If you can test your cdi and let me know, I'll see if I can find the specs - also, are you able to check your timing?

Dec 25, 2015 | kawasaki 2005 Brute Force 750 4x4i

1 Answer

Good spark clean carb and tank. Wont even backfire or try to start.


Hi, Pete and the usual suspects are:
1. Fuel tank empty.
2. Fuel supply valve/petcock turned off.
3. Fouled spark plugs.
4. Engine flooded as a result of overuse of the enricher.
5. Vacuum hose to the fuel supply valve/petcock disconnected, broken, cracked, or pinched.
6. Fuel valve/petcock or filter clogged.
7. Discharged battery, 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.
8. Loose or corroded wire connection at the coil, battery or plug between ignition sensor and module.
9. Spark plug cables in bad condition and shorting, cable connections loose, or connected to the wrong cylinders.
10. Ignition timing incorrect due to a faulty ignition coil, ignition module or sensors (MAP, CMP, CKP, O2 and/or BAS).
11. Security alarm needs a reset.
Good luck and have a nice day.

Nov 19, 2015 | GAS Motorcycles

1 Answer

Missing backfiring


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 especially the ground cable at BOTH ends, 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 valve.
For a prime suspect please visit website below and good luck:
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

Jul 08, 2013 | Harley Davidson Motorcycles

1 Answer

86 el camino stalls under load


As mentioned above, engine could be starving for fuel; but
also consider ignition system - as engine makes more power, maximum cylinder pressures increase. A higher spark voltage is then needed to ignite mixture (at a few degrees before top dead center... top of piston travel).
If coil is weak, plugs fouled, or plug gap too wide, adequate spark may not occur. This may cause missing,
loss of power, sometimes backfiring (backfiring may occur if timing is off, or intake valve leaky, also). If you replace the fuel filter, 'kit' the carb, but problem remains,
look to ignition system.

Diagnostic process - put a fuel pressure gauge in line, where fuel line enters carb. Rig so can see gauge, while driving. Have a passenger watch fuel pressure as you drive; especially while accelerating. If fuel pressure drops during acceleration, then its either fuel pump or filter. If pressure remains stable, consider carb issue.
If possible, test with exhaust gas analyzer, while engine
under load (possibly at an emissions test place). If lean under acceleration, its a carb problem. If not, look at
ignition system (emission test diagnostics should help here, also). Oh, and one thing I did once.... forgot to release parking brake..... duh.

Best of luck !

Dec 28, 2012 | 1986 Chevrolet El Camino

1 Answer

I have a 1991 FXR Super Glide with a front cylinder that won't fire. I have replaced coil, plug wires, plugs, carb manifold and seals but she's still miss firing. Can anyone give me any...


You need to run a compression test on the engine. The cylinder pressure should be around a hundred pounds or more. There should be no more than 10% difference between the cylinders. If the compression is low enough to cause it not to fire, you probably have a blown head gasket.

You didn't mention what kind of igntion system you have in the bike. If you have the original ignition system, it's a dual fire system and both spark plugs fire at the same time every time the pistons come up to top dead center. This means that one cylinder fires on the exhaust stroke and this is called a "wasted spark" system. Harley has used this type of ignition for almost all their Bit Twins and Sportsters for many years. If your bike has an after market single fire ignition system, the ignition system could be bad causing the missfire. In this case, you would have an aftermarket coil as well with three primary connections on it.

Good Luck
Steve

Jul 01, 2011 | 1993 Harley Davidson FXR Super Glide

1 Answer

I have a 95 Road King that isn't running right, it


Backfiring out of the exhaust is usually an ignition problem. Unburned fuel is getting into the exhaust system because it's not being ignited in the cylinder. When the engine fires on that cylinder again, it ignites the raw fuel in the exhaust causing the pop that people call a backfire. I'd investigate the ignition system. Connect a timing light to each of the spark plug wires if it has a single fire ignition or either of them if the ignition system is the stock dual fire. Start the engine and watch the timing light to tell if the engine is missing as the light will miss a flash.

Good Luck
Steve

Jun 05, 2011 | 2000 Harley Davidson FLHR-FLHRI Road king

1 Answer

Missing and backfireing, while running


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 especially the ground cable at BOTH ends, 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 or intake seals.
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 valve.
For a prime suspect please visit website below and good luck:
Big Twin Carb EFI DTC Intructions codes Harley Davidson Forums Harley...

May 15, 2010 | 2003 Harley Davidson FXDWG Dyna Wide Glide

1 Answer

1981 Wide Glide Bike is missing and backfiring


open up the ignition cover plate and check the backing plate. it may have come loose and threw the bike out of time.
make sure your plug wires are plugged on tight and the coil wires are secure.
It is most definitely a timing problem.

Jun 05, 2009 | Harley Davidson FXDWG Dyna Wide Glide...

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