Question about Harley Davidson FLSTF - FLSTFI Fat Boy Motorcycles

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Looking for best synthetic replacements for trans, engine and primary along with fluid weights for ohio bike.

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Its all a matter of opinion. Best to my Knowledge is Mobil 1 V-twin formula 20W50 Full Synthetic. Holds up better then even Syn 3 Harley Oil. But if thats not available then Stick with Harleys Syn 3

Posted on Apr 03, 2011

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Were do i add transmittion fluid on 2001 harley dyna super glide sport?


Your Harley has 3 oils in it. #1 is Primary, #2 is Trans and #3 is engine. If you're leaking oil down from you kick stand area it is more than likely that your Primary cover is leaking. There is a fill plug at the top of the cover, when you remove the plug while the bike is sitting on the kick stand, the oil should come up just touching the bottom of the clutch hub.
On a side note this oil should be drained every 10k - 15k miles.
You really should spend the $50 for a service repair manual for your bike. It's like a bible for these bikes. Also if you haven't found them already go to www.harleytechtalk.org It's a free Harley site, one of the best I've ever found. Just sign up. If you like it they work strictly on donations IF you want to donate, but it's not necessary.

Jul 25, 2014 | Red Line 57905 75w90 Synthetic Gear Oil 1...

1 Answer

2006 dyna street bob. mistakenly drained the primary like others. can i use regular oil in a pinch


Your bike came with H-D Syn3 20W50 engine oil in the engine, primary, and transmission. You can use most any oil you wish in the primary on a temporary basis but I wouldn't go any higher viscosity than straight 30 weight. The 20W50 oil is the same viscosity as a 20 weight oil when it's cold. When hot, it's the same as a hot 50 weight oil. The primary really doesn't need a specific type of oil. The "old timers" would put automatic transmission fluid in the primaries of their bikes. All it basically needs is something to lube the primary chain and sprockets. With the bike standing straight up, fill the primary until the oil is just up to the bottom of the outer clutch shell. Do not overfill or you'll have difficult finding neutral with the engine running and the clutch will drag.

Good Luck
Steve

Sep 02, 2011 | 2006 Harley Davidson FXDWGI Dyna Wide...

1 Answer

What weight oil do use in 2004 electra glide?


Your bike came from the factory with H-D Syn.3 20W50 synthetic oil in the engine, primary case, and transmission.

Aug 15, 2011 | 2004 Harley Davidson FLHTCUI Electra Glide...

2 Answers

Best oil for the primary and secondary?


I don't know what you are referring to when you say "secondary". The best engine oil is the H-D Syn3 20W50 oil. You can use most any oil you want as long as it has the proper API rating. I think Harley requires a "C" rating on their oil for use in diesel engines.

For the "primary" case and transmission, I use H-D Primary lube for Sportsters if I can find it. Harley had changed over to another name for the Sportster oil.

Now, there are several other manufacturers of lubricants that are suitable for use in your Sporty. Manufacturers like Amsoil, Royal Purple, Mobil, and a few others. You'll have to go to their websites to get a list of what to use where.

Good Luck
Steve

May 28, 2010 | 2000 Harley Davidson XL 1200 C Sportster...

2 Answers

I,ve got a 2008 Ultra classic, and want to change the fluids. It's got 8000 miles, and i dont have a owners manual. the oil, i can figure out , but the trans, and the primary I dont have an idea.


On the bottom of your transmission, there are two drain plugs, one for the transmission and one for the engine oil. The plug in the center is the transmission drain plug and the one toward the left front is the engine oil drain. The primary drain is a small pipe plug that takes a Torx wrench located at the bottom of the primary cover towards the rear of the bike.

Engine oil three quarts with filter. Then start the bike and let it run for a few minutes. Shut down the engine and check the oil level with the dipstick. The dipstick has two marks on it. "Full Cold" and "Full Hot". Fill to the full cold mark.

Transmission takes 20-24 ounces of oil and the primary takes 38-44 ounces of oil. Do not overfill the primary as it will cause your clutch to drag. All three sections take H-D Syn3 20W50 synthetic engine oil.

May 23, 2010 | 2005 Harley Davidson FLHTCUI Electra Glide...

2 Answers

What kind of oil do i put in to my 2003 1200 sportster transmission?


you can put the screaming eagle syn3 full synthetic 20/50 in your engine,trans,and primary

Apr 06, 2010 | 2003 Harley Davidson XL 1200 C Sportster...

1 Answer

Just need to know the specs for fluids (oil & gear) on my 02' Dyna FXD


On the '02 bikes, the engine, primary, and transmission came with Harley-Davidson SYN3 synthetic oil in all three areas. Three quarts of engine oil, 32-36 ounces in the primary, and 20-24 ounces in the transmission.

The SYN3 oil is a synthetic 20-50 weight oil with a "C" rating on it. Check the API code. It will say something like SJ-CG. The "Cx" is what you're looking for as this tells you that it has the high pressure additives in the oil for use in diesel engines. Harley has always recommended using "C" rated oils in their engines.

Sep 26, 2009 | 2002 Harley Davidson FXD Dyna Super Glide

3 Answers

What grade oil to use for tran. and primarry on 2007 harley flhx


You can use harley syn in all 3 fluid chambers, Primary, Oil Bag, Transmission. If you dont use syn, harley has a Primary and tranny oil same thing same bottle.

Jun 19, 2009 | 2008 Harley Davidson FLHX Street Glide

4 Answers

Changing fluids


Trans plug is under the Primary cover ( Left side ) and the Oil line is under the frame on the left side. Look for a oil line with a plug attatched to it. Run the bike up to operating temp. Primary and trans are the same thing ( Sport Trans fluid ) 1Qt in the primary ( fill throught the little cover on the side of the primary, and fill the oil through the oil tank. Put a little oil in the filter too, before installing, this will give the motor a little bit of oil until the rest of it makes it way through. You'll also need 1 p/n 11105 for the drain plug on the primary.

May 02, 2009 | Harley Davidson Harley-Davidson Motorcycle...

4 Answers

98 fatboy engine noise.


Harley's do run hot, anywhere from 220 to 240 normally, and a little hotter this time of year. I suggest running a straight weight oil, and a little heavier weight in the summer. I use Valvoline VR-1 30 weight most of the year, and 50 or 60 weight in the hot summer, and I use Lucas 20w50 primary/trans for the primary and tranny. I don't bother with the extremely high prices of the HD oils. For the whining noise, you need to determine which side of the engine it's coming from. Whining will almost always be in the bottom end. There's nothing in the top end that should whine, and if there is whining from the top, it's usually an air leak around the carb. Start by checking the fluid levels in the tranny, and primary. These are the two most common areas to pick up a whining noise. If it's coming from the left, it's going to be in the primary, and usually this is caused by low fluid levels. From the right, it's going to be either the tranny, low fluid, or the oil pump. The oil pump is a gear type system. If you're running a light weight oil, say a 10w40 or HD 20w50, when the engine heats up and the oil thins, it can cause the oil pump gears to whine a bit, especially in the summer heat. So, check the fluid levels, if they check good, then change the oil, since the summer is coming to an end, go with a straight 30 weight. This should clear up the whining noise. If it doesn't, get back to me with the exact location the noise is coming from, and we'll go to the next level of diagnosing the whine, but I believe that this will cure it.

Aug 22, 2008 | Harley Davidson Harley-Davidson Motorcycle...

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