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What Primary Oil is your Choice
#121
i dig my redline mtl. gives much better clutch feel than the grabby 'ol formula plus. before i was always thinking my clutch needed adjustment. now, despite the weather and how long i've been in stop and go, it stays ultra consistant.
#123
Yes, the primary and transmission on Sportsters share a common sump and use the same oil. This limits your choices. You don't want to use a GL-5 gear oil, and you don't want to use ATF. Harley's Formula+ is probably the best all around fluid for the Sportster transmission.
#124
As far as the combination primary/tranny on the Sportsters, many that I know (including myself) run the Mobil 1 75W90 gear lube without any problems at all.
Some of these bikes have well over 50,000 miles on the ticker, and no one has experienced any problems at all with the clutch pack.
Mobil 1 75W90 synthetic gear lube does have a API GL-5 rating.
Also, many think that 75W-90 gear lube is much to "thick" to use in a primary, but as you can see from the below chart viscosity of motor oil and gear lube is rated differently.
75W90 gear lube has about the same viscosity (thickness) as 20W50 motor oil.
Some of these bikes have well over 50,000 miles on the ticker, and no one has experienced any problems at all with the clutch pack.
Mobil 1 75W90 synthetic gear lube does have a API GL-5 rating.
Also, many think that 75W-90 gear lube is much to "thick" to use in a primary, but as you can see from the below chart viscosity of motor oil and gear lube is rated differently.
75W90 gear lube has about the same viscosity (thickness) as 20W50 motor oil.
Last edited by OldFenderGuy; 02-22-2009 at 09:38 AM.
#125
It's no wonder the clutch is so grabby with Formula+ at cooler temps. I'm dumping it out of my primary next chance I get.
Last edited by Gary7; 02-24-2009 at 10:31 PM. Reason: typo
#126
#127
got amsoil in both holes in the sporty, come the summer i will be switch it gear lube for the primary since its connected to the tranny and it gets hot as haties down here in FL during the summer