Board index Flathead Power-Technical Questions, Answers, and Suggestions Big Twin Flatties oil level

oil level

Post Thu Apr 24, 2008 12:17 am

Posts: 42
Location: Finland
What is the correct oil level in UL oil tank.
My dipstick has only two markings. "danger" in bottom end and "Refill" closer top.
No other markings.
Usually its good to have air space over oil level (in british bikes which I am more familiar to).
So how much over refill mark (or under filler hole) is good?
Service manual only says "more oil, better cooling..."

Post Thu Apr 24, 2008 6:05 am

Posts: 641
Location: Wisconsin, USA
At the refill line you can add a quart. You need to leave the level just below the return/vent line fittings.

Post Thu Apr 24, 2008 7:04 am

Posts: 42
Location: Finland
Thanks for that info.
I had about half quart over refill mark (did not want to overfill)

Long project ,total overhaul, behind and doing running-in.
seems to working OK,,partially thanks to this FP-tech talk.

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