Question about 1979 Harley Davidson XLH 1000 Sportster

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If the brushes on my 79 sporty get oil on them will cause it not to charge

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I can't say that I have ever run into this problem before. The brushes are on the outer end of the generator from any oil and not readily available for oil to get on them. The bike would have to have a terrible rocker box leak and the protective band would have to be off. But, I guess it's possible for oil to prevent a generator from charging. It's simple enough to pull the end off the generator and clean up the commutator ring and the brushes. Make sure you polarize the generator when you put it all back together by momentarily shorting the armature terminal of the generator to the positive post of the battery.

Good Luck
Steve

Posted on May 25, 2011

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Odds are your alternator brushes need replacement.. Good bet here is to find a 79 up GM alternator (with the internal regulator) to fit the bracket an a minor wiring will solve this problem.

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Here are both a section view and an exploded view of the 79 to 84 clutch. Hope it helps. You didn't specify what year Sporty you have.

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79 XLH Ironhead Sporty runs great till I rev it above 3000 rpms.Could I have to much oil? I have considerd air fuel mixture not right , also timing , but it runs perfectly at low revs. thanx Tom Harley


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What gap are the plugs supposed to have ?


Depends on which spark plugs you're running and the year model of your Sportster. Please provide this information and I can help you.
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Oct 25, 2010 | 1979 Harley Davidson XLH 1000 Sportster

1 Answer

2006 sporster 1200 lots of valve noise has oil pressure.think it is colasped lifters. what your thoughts.or trouble shooting tips without breaking down the engine


If you're having that much valve noise, you have probably lost oil pressure for some reason. Take your oil filter off the engine and take the spark plugs out. Spin the engine with the starter and watch for oil to pump out of the fitting for the oil filter.

Now, you didn't mention how loud the valve noise was. If you have indeed lost oil pressure to your tappets, the noise will be quite noticable, not just a slight rattling. Your bike will sound like a pea thrasher.

The late model Sportster oil pumps are not like the older models that were so bad about shearing the drive pins. The late model doesn't have the pins. They have flat drive angles on the oil pump shaft. About the only thing that I can think of that would cause a loss of oil pressure on a Sporty is a piece of trash got into the tank and is blocking the inlet to the pump or the pump is air locked for some reason. Unscrew the oil pressure sending unit and spin the engine over long enough to pump out a few ounces of oil.

I've only seen one Evo Sporty lose oil pressure. Someone had tried to stop an oil leak in the oil tank by Creme coating the tank. Creme is designed for a fuel tank, not an oil tank. The coating cannot take the heat of the hot oil, becomes brittle and starts flaking off.

Good Luck
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1 Answer

I have a 2006 883 sporty( wifes) and this past summer it began it pass oil out the breather, not alot but enough to make a mess after a long ride and it puddleson engine when bike is on stand.Oil is not...


Most of the time the oil problem is caused by the little breater "umbrellas" in center rocker box section. Over time of heating and cooling, the little "umbrella" become brittle and fail to seal properly. Crankcase pressure then blows the oil out of the top of the heads and into the breater.

Most people purchase and install an aftermarket breather kit that reroutes the crankcase pressure. This is fine but it does not stop the oil problem, it just keeps it out of the breather and moves it somewhere that it is not as noticable. The proper fix it to remove the rocker boxes and replace the little umbrella seals.

Also, you say that the oil tank is not overfilled but I've see it thousand times on Sporty's. People will check the oil before a ride and fill the tank to the top line on the stick. Too much oil. The stick has two lines, the lower line is "full cold" and the upper line is "full hot". As long as the oil is between the two lines do not add oil to the tank. I've seen the oil filler plug blow out after the oil gets hot. The oil expands as it heats up. Check the oil when the engine and the oil is hot.

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The Ironhead Sportys have a tendency to do this when the Gerotor Gear Set is worn. These are the thin set of drive gears in the oil pump. HD Part # 26492-75. Do you have a problem WET SUMPING? This is when the oil drains from the reservoir into the crank case if the bike sits for a period of time and when you attempt to start it pukes oil from the breather tube. If so you need to check these gears. Gerotor Gear Sets inner/outer clearance should be .000 the shaft should have a clearance of .0005 and the feed gear height in the pump should be .011. Normal operating pressure when hot should be 4 psi at idle and 10-20 psi at 3500 rpm. The pumps generally have issues before the rocker bushings.

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1 Answer

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