Question about Harley Davidson FXST Softail Standard Motorcycles

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Gas coming out the oil vent line and gas in my oil on my 1990 FXSTC

At start up I had gasy oil coming from crake case vent then it stoped and the motor started. it sounds good and runs good. then while running I pulled the oil tank cap and had pressure blowing out and have gas in oil so I stoped the motor

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  • Harley Davidson Master
  • 448 Answers

Sounds like either the carburator float is stuck, or there is a piece of dirt between the carb needle and seat, or the rubber on the bottom of the needle is cracked. The bottom of the carb (float bowl) must be removed to check the float level. Instructions for doing this are in the service manual. With a carb this old, a carb rebuild wouldn't hurt. The kit for this isn't very expensive and if you are mechanically inclined, can be done at ome. Good luck!

Posted on Jan 23, 2013

  • 9 more comments 
  • Scott Ford
    Scott Ford Jan 24, 2013

    Thanks Brett, that's sounds like it could be problem. but would that have put pressure in my oil tank. anyways I put new oil and filter and it's running fine atm.

  • Brett Drew
    Brett Drew Jan 24, 2013

    Yes, this would have caused pressure in your oil tank. The gas leaking from the carb would leak into the cylinders, past the rings and into the crankcase. The scavenge side of your oil pump would then pump the gas into the oil tank, overfilling it and causing the pressure.

  • Scott Ford
    Scott Ford Jan 24, 2013

    ah, ok Brett thx again dude.

  • Scott Ford
    Scott Ford Jan 26, 2013

    Brett I jope your still there man, lol. Ok I changed my oil again just to be sure to get all the old gasy oil out. With my filter out and my plug wires off I turned the motor over two times to get the oil out the crake case and on the third time notting happen, it was like my battery was dead. anyways I put all new oil and all back checked my battery and it had a full charge. still i will not turn over and no lights or anything comes on. I put the charger on it and then tried the lights and they come on but when I hit the horn it just makes a buzzing like sound and the starter just ticks, also I have an electric tach and with the charger on when I turn the starter switch on the tach pegs out. but with the charger off notting works or comes on. I got it to start one time and rode it arouind the block got back home turned it off and notting again. I thought maybe my IGNITION switch was bad so I got a new one but still does the same, plz help......

  • Brett Drew
    Brett Drew Jan 26, 2013

    How old is the battery? If you don't know, take it out of the bike. If it's a Harley battery, there will be a date code on the side. For example C6. This would mean the battery was made in the 3rd month of 2006. Anything much over 4 years old, we recommed replacing, but I have seen them go as long as 8 or sometimes 9 years if a Battery Tender is used all the time. Before removing the battery, make sure all the connections are tight, at both ends of the battery cables. If the batter is newer and the cables are tight and not corroded, replace the main circuit breaker.Also, it's possible for the battery to show a full charge, but not have enough cold cranking amps to crank the bike. The battery would have to be load tested to find out if that is the problem. Do that as a last resort. Let me know how it works out!

  • Scott Ford
    Scott Ford Jan 26, 2013

    thx man, i'm putting two pics to see if this is the main breaker, also cables are tight and battery is 2 or 3 yrs old but I can get it load tested if u think thats it. I mean it shows full charge at almost 13votes but on lights are notting comes on unless I have the charger hooked up to it, thats whats puzzsles me. well heres the pics you will see the starter relay and behind it or on the side is a breaker.



  • Brett Drew
    Brett Drew Jan 26, 2013

    That may possibly be your problem. The nut and threads are corroded, so the guts probably are too. I routinely replace the ones in my \'91 bagger ever 4 or 5 years. Replace all the circuit breakers while your at it, cheap insurance. Two or three years old for the battery should be ok, but if all else fails, get that thing load tested. Harley dealers have a new tester that charges the battery while testing it. It\'s pretty slick and will tell you if the battery is good or not. I was playing with ours (been keeping it in my office) and I\'m very impressed with it. Don\'t know what, if anything, your local dealer will charge you to hook it up.

  • Scott Ford
    Scott Ford Jan 26, 2013

    ok dude thx, the HD shop in Houma Louisiana is closed, but I'll go get the breaker monday and let you if thats it man, thx again dude

  • Scott Ford
    Scott Ford Jan 27, 2013

    Ok Brett, I was able to get a breaker today. I put it on and the same thing happen as before. So I tried something new. I took my jumping cables and hooked it from my truck to my Bike, I didn't start the truck. I turned on my switch on the bike and the lights came on, I hit the starter and she turned over. So I turned everything off, took off the cables and then turned back on the bike switch and eveything was on again, so I hit the starter and started it up, I ran it there a while, stopped it then stared it again. then took it for a 30min ride in town. got back home stopped it and started it again. all seams find now. do u think It just need a jult from a stronger battery to reset the switch or do you think I should still get my battery load tested ?

  • Brett Drew
    Brett Drew Jan 27, 2013

    Replace the breaker and see what happens. It's possible the battery was just low because of all the cranking you did. Full charge should be 13.8-14.2 volts or so. Ya did good by not strarting the truck before jumping the bike. You could have fried the bike's electrics with the extra voltage the truck's charging system was putting oout. When jumping a bike with a vehicle, never have the vehicle running, unless it's another bike. Keep me posted. If the problem continues, get the battery load tested. And if you don't already have one, get a battery tender. You can plug it in and forget about it. It won't overcharge the battery and the battery will last much longer.

  • Scott Ford
    Scott Ford Jan 27, 2013

    well the old breaker is trashed, the threads were so rusted when I tried to take the nuts off the whole post came out, lol. And yes I was told a long time back about jumping when a truck or car not to start it, thx. the battery is at 12.95 to 13.0

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Posted on Jan 02, 2017

wd4ity
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SOURCE: High Idle On Start-up.

Most fuel injected motorcycles do start up in a "fast idle" mode. Although I don't know much about fuel injection on Harleys (H-D will not tell you much about it unles you are one of their technicians), I don't think the system is equipped with an engine temp sensor. Since the crank case sensor get it's pulses from pockets cut into the outer edge of the left side flywheel half, the sensor will have oil on it.

Posted on Sep 24, 2009

v2iper
  • 150 Answers

SOURCE: High idle on start-up

Its your idle senser sits on top of the manifold u will see it looking at u when u take off air filter cover. Little black plastic.plug in.

Posted on Dec 20, 2009

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