Sportster transmission
#1
Sportster transmission
I have a question regarding sportster trans oiling. Is the lubrication of the trans shared with the engine oil? From the service manual it appears when you change the engine oil that you are also draining the transmission too. If this is so than the primary housing is containing only oil to lubricate the chain and clutch assemblies. Please let me know if I am correct.
Diverherb
Diverherb
#4
I have a question regarding sportster trans oiling. Is the lubrication of the trans shared with the engine oil? From the service manual it appears when you change the engine oil that you are also draining the transmission too. If this is so than the primary housing is containing only oil to lubricate the chain and clutch assemblies. Please let me know if I am correct.
Diverherb
Diverherb
#5
Although some of the earlier "ironhead" Sportsters had something I think they called a transfer valve (or port) that allowed some interchange of oil from crankcase to primary, all newer Sportsters have isolated crankcase lubrication from the primary/transmission lubrication.
You change the crankcase oil by draining the oil tank. You change the primary oil by removing a drain plug on bottom of case, primary side.
John
You change the crankcase oil by draining the oil tank. You change the primary oil by removing a drain plug on bottom of case, primary side.
John
#6
The early sportsters had a dry clutch. They could have been like the panheads , they had a dry clutch as well. I don't think the big twins went to a wet clutch till 1984. and had a port that lubed the primary chain. It was a total loss system and had a drain in the bottom of the primary cover. That's where the tale that they all leaked got started,
Maybe not, Up to '69 they were damp clutches. Called dry but rarely so. Ran in an oil bath but had a dome on the basket covering the clutch mechanism as well as a seal in the hub nut.
Maybe not, Up to '69 they were damp clutches. Called dry but rarely so. Ran in an oil bath but had a dome on the basket covering the clutch mechanism as well as a seal in the hub nut.
Last edited by hexnut; 09-23-2016 at 09:31 AM.
#7
The early sportsters had a dry clutch. They could have been like the panheads , they had a dry clutch as well. I don't think the big twins went to a wet clutch till 1984. and had a port that lubed the primary chain. It was a total loss system and had a drain in the bottom of the primary cover. That's where the tale that they all leaked got started,
Maybe not, Up to '69 they were damp clutches. Called dry but rarely so. Ran in an oil bath but had a dome on the basket covering the clutch mechanism as well as a seal in the hub nut.
Maybe not, Up to '69 they were damp clutches. Called dry but rarely so. Ran in an oil bath but had a dome on the basket covering the clutch mechanism as well as a seal in the hub nut.
Since the BT has a(physically) separate transmission, I guess they could run a dry primary (belt?) or wet (chain?) like they do today.
John
Last edited by John Harper; 09-23-2016 at 06:44 PM.
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#8
#9
I believe 20/50 Amsoil would work fine in your primary, it's highly regarded oil. I use M1 75W90 gear oil in my primary. GTX 20/50 in the engine, at the moment. Harley black oil filter for me, although I think WIX (NAPA?) has some merit from what I've read.
John
Last edited by John Harper; 09-26-2016 at 07:12 PM.
#10
My '02 Sporty manual calls for one qt.(32 oz.) in the primary/tranny cavity.
Three qt engine oil. I usually do 2 1/2 qts. to see where the dipstick is at.
Too much oil will give you A/C oil blowback and it gets messy.
I can always add more if needed.
I use Sporty trann/primary oil.
It's designed for the trans/primary.
Dump in a qt. and you're done.
Unless you find a pool of oil under the bike, you don't have to check.
It doesn't have a dipstick like the engine for checking.
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