Primary lube
Dirt don't hurt
Joined: Jan 2011
Posts: 21,065
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From: Haslet Texas
Barnett says don't use synthetics with their clutch plates but if you aren't having any problems then I wouldn't worry about it.
Personally I think you are overspending for your primary fluid but hey your bike your choice.
Personally I think you are overspending for your primary fluid but hey your bike your choice.
Road Master
Joined: Sep 2016
Posts: 1,048
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From: Heart of Georgia
Yes. It’s bad. There are no gears in your primary so there is no need to use gear oil in there. It’s too thick. There are plenty of primary chaincase oils on the market that will do a much better job.
Outstanding HDF Member
Joined: Sep 2011
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From: No where near you, OH
Hate to hijack a thread but I have to replace the primary gasket sometime this weekend because of excessive leaking so I'll be watching this discussion
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Outstanding HDF Member
Joined: Sep 2011
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From: No where near you, OH
I went to a Harley dealership and got formula+ primary and chain case lubricant. Not synthetic. My opinion is that gear lube is made for gears not primaries. If I were you I'd drain yours and replace it with the right stuff at risk of destroying your clutch
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Joined: Jul 2015
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From: Alaska
I have a home machine shop and use a lot of atf as cutting fluid, it's cheap, plentiful and I can get it anywhere.