90 sportster 1200 fluids
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Cruiser
Joined: Jun 2024
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From: Fort Lee
90 sportster 1200 fluids
Hi All, Going to replace trans oil and brake fluid. I'm seeing all different weights and brands recommended. What's the correct oils for (trans and brake) for a 90 sportster 1200. Thanks V
Stellar HDF Member
Joined: Sep 2013
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From: USA
The info you're looking for is in the owners manual.
99466-90_en - 1990 All Models Owner's Manual | Harley-Davidson SIP
I don't think the Sport - Trans Fluid (page 135) is available any more. I use Formula+ in the trans now.
99466-90_en - 1990 All Models Owner's Manual | Harley-Davidson SIP
I don't think the Sport - Trans Fluid (page 135) is available any more. I use Formula+ in the trans now.
Grand HDF Member
Joined: May 2014
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From: florida
for the trans, Formula+ is what the factory now recommends, I however dont like it. there are several aftermarket brands that offer the fluid, its called sport trans oil(or lube) Belray's product is good and Spectro's STL is great.
Brake fluid is
DOT 5 silicone,,,,,,,,,********^^^^^^important********** ****Dot 5 silicone is NOT the same asDOT 5.1*******************
engine oil, good quality motorcycle oil at 20w50
m
Brake fluid is
DOT 5 silicone,,,,,,,,,********^^^^^^important********** ****Dot 5 silicone is NOT the same asDOT 5.1*******************
engine oil, good quality motorcycle oil at 20w50
m
Thread Starter
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Cruiser
Joined: Jun 2024
Posts: 118
Likes: 15
From: Fort Lee
Bel Ray 85W-40 good? I was thinking....not sure what brake fluid is in there now(just bought the bike)...how can I tell so I dont contaminate anything and wind up with a gel in my brake lines. V
Last edited by Vza; Jul 13, 2024 at 02:46 PM.
Seasoned HDF Member
Joined: Aug 2006
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From: Pennsylvania
1. As above, you cannot go wrong with the fluids recommended in the owner's manual.
2. The primary & transmission are common to each other and use the same fluids.
3. The type of brake fluid should be labeled on your front & rear master cylinders, I think the 1990 Sportsters used DOT 5.
4 If you are going to work on your Sportster, a good investment is a H-D Service manual.
NOTE:
The above information, while credible, is worth what you paid for it and should not be considered gospel.
Do due diligence, research and have a H-D Field Service Manual before working on your bike.
You will probably have many opinions and suggestions presented; make sure you research the person providing the helpful information as there are some who provide good information that is useful and some who speak out of other orifices with gibberish. You will figure out this quickly.
2. The primary & transmission are common to each other and use the same fluids.
3. The type of brake fluid should be labeled on your front & rear master cylinders, I think the 1990 Sportsters used DOT 5.
4 If you are going to work on your Sportster, a good investment is a H-D Service manual.
NOTE:
The above information, while credible, is worth what you paid for it and should not be considered gospel.
Do due diligence, research and have a H-D Field Service Manual before working on your bike.
You will probably have many opinions and suggestions presented; make sure you research the person providing the helpful information as there are some who provide good information that is useful and some who speak out of other orifices with gibberish. You will figure out this quickly.
Stellar HDF Member
Joined: Sep 2013
Posts: 3,492
Likes: 610
From: USA
DOT 5 - page 142 of the owners manual. You might want to read it.
On a sportster the primary fluid and trans fluid are the same. They are not independent like the big twins are. See chart on page 156.
On a sportster the primary fluid and trans fluid are the same. They are not independent like the big twins are. See chart on page 156.
Last edited by 14GuineaPig; Jul 13, 2024 at 03:08 PM.
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