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Harley flhs/1990 looses all power and then comes right back

Posted by Anonymous on

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  • Harley Davidson Master
  • 40,632 Answers

Hi Anonymous, and the usual suspects are:
1. Severely discharged or damaged battery.
2. Loose, corroded or broken battery cable.
3. Alternator not charging or below normal rates.
4. Failed ignition coil, ignition/electronic module.
5. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor.
6. Faulty ignition switch.
7. Water or dirt in fuel system, carburetor or filter.
8. Fuel tank vent system plugged or gas cap not venting.
9. Fuel tank empty.
10. Fuel valve vacuum line broken or carburator vent line closed off.
11. Restricted, blocked or kinked fuel line.
12. Failed fuel pump, pressure regulator and or fuel injectors.
Good luck

Posted on May 21, 2015

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Posted on Jan 02, 2017

wd4ity
  • 4565 Answers

SOURCE: i have 1990 harley flhs ..model flt 1340cc..when

It sounds like the jets in your carb are stopped up. It could be any one of several things but the problem is in the carb. Cleaning the outside of the carb makes no difference, you must remove and clean out the main jet and the slow speed jet. Also you need to check the operation of the accelerator pump. Even spraying carb cleaner inside the venturi of the carb does no good, the carb needs to be completely disassembled and cleaned. To be more specific, I'd need to know exactly which carb is on the bike, keihen butterfly, keihen CV, or aftermarket.

Posted on Apr 21, 2010

wd4ity
  • 4565 Answers

SOURCE: no power to bike/new charged battery/is there

The pre-2000 models came with circuit breakers instead of fuses. They look like little metal cans that are about 1/2" wide by about 1 1/2" long. When a short circuit causes the current draw to exceed the rating of the circuit breaker, it will break with a slightly audible "ping". After a few minutes, it will reset itself. If the short circuit is still present, it will simply start the cycle all over again.

Now, there is a main circuit breaker. Usually it's under the seat and it's rated at 30 amps. It could have been replaced with a fuse by a previous owner if the bike was purchased used.

Now, at the battery or the starter, you should have an additional wire that supplies power to the entire bike. The large battery cable connects to the postive side of the battery and then goes down to the starter. Your bike should have the Nippondenso type starter on it as the '88 year model was the last to have the seperate starter solenoid and Hitachi starter. At one or the other places, the starter or the battery, there should be a large single wire connected along with the battery cable. This wire is the what I call the "accessories" power wire. It must be connected or there will be no power to the rest of the bike. If you failed to reconnect it at the battery, this could be your problem.

If you will contact me directly and tell me you need a schematic for your '89 FLHS, I can send it to you e-mail. wd4ity@bellsouth.net

Good Luck
Steve

Posted on Jul 05, 2010

nedkelly900
  • 345 Answers

SOURCE: a 93 flhs loosing charge in less than 2 hour

sounds like your battery is not charging from the engine. Most likely the cause of this is, a faulty Rectifier.
I suggest you charge your battery up, put it in the bike and start it up. Using a Volt meter, check the reading, to see if charge is going into the battery, reading should be about 14V with a little rev of the engine. If the reading remains at 12V, then ther is no charge going in.
If you have charge going in to your battery at idle, 13.5 - 14Volts,
Then i suggest your battery is faulty.

Posted on Jul 08, 2010

  • 63 Answers

SOURCE: I have a 1990 Harley Davidson flhs. The air leaks

The leak most probably is coming from the seals at the "manifold" assemblies on the very top of the fork tubes. Replacement will require the windshield and speedometer to be removed for access to that area. Also check the hose that runs to the hadlebars are the might be a crack or small hole in it. BTW, while the system is supposed to be an "anti-dive" front end you will suffer no long term ill effects from having no air in it.

Posted on Aug 09, 2010

george_karas
  • 207 Answers

SOURCE: what causes a harley to backfire

Damaged distributor cap or rotor,Low Fuel pressure,clogged fuel filter, poor Carburettor Adjustment, Dirt or water in fuel, faulty valve lifter or spring,Valves need Adjustment,Worn Engine Valves ,Or sticking Valves,Poor Ignition H/T Leads ,Or ignition timing out.

Posted on Sep 24, 2012

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Hi Anonymous, and the usual suspects are:
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I have a 1990 Harley Davidson flhs. The air leaks out of the front suspension over a day. The fork seals are not leaking oil. The handle bar serves as the reservoir for the air. Any suggestions where the...


The leak most probably is coming from the seals at the "manifold" assemblies on the very top of the fork tubes. Replacement will require the windshield and speedometer to be removed for access to that area. Also check the hose that runs to the hadlebars are the might be a crack or small hole in it. BTW, while the system is supposed to be an "anti-dive" front end you will suffer no long term ill effects from having no air in it.

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A 93 flhs loosing charge in less than 2 hour


sounds like your battery is not charging from the engine. Most likely the cause of this is, a faulty Rectifier.
I suggest you charge your battery up, put it in the bike and start it up. Using a Volt meter, check the reading, to see if charge is going into the battery, reading should be about 14V with a little rev of the engine. If the reading remains at 12V, then ther is no charge going in.
If you have charge going in to your battery at idle, 13.5 - 14Volts,
Then i suggest your battery is faulty.

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I have 1990 harley flhs ..model flt 1340cc..when choke on bike runs and revs up ..take choke off bike idels but wont rev up ..it back fires n pops..i cleaned carb and it getting gas to carb..


It sounds like the jets in your carb are stopped up. It could be any one of several things but the problem is in the carb. Cleaning the outside of the carb makes no difference, you must remove and clean out the main jet and the slow speed jet. Also you need to check the operation of the accelerator pump. Even spraying carb cleaner inside the venturi of the carb does no good, the carb needs to be completely disassembled and cleaned. To be more specific, I'd need to know exactly which carb is on the bike, keihen butterfly, keihen CV, or aftermarket.

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