I'm hoping someone can give me an answer to an ongoing argument I'm having with a "know it all" guy I work with.

According to the guy who built my custom bike (1976 4-speed tranny), he told NOT to fill all the way... instead, fill the tranny about 1/4 inch above the bottom of the "splasher".

According to the guy I work with, it should be filled to the bottom of the threads. His school of thought is: If there aint a dip stick or a fill hole, then fill it all the way to the threads!

Any advice would be helpful.

Thanks!

 

Remove the allen headed plug on the side of the transmission cover and with the bike up right fill till lube begins to run out. Ben doing it this way for 34 yrs and always worked for me.
WUZFUZ

 

They take about 3/4's of a qt.
We used to run our AHDRA racer with about 12-14 oz. of Red Line Lightweight Shockproof. (green)
Never hurt a thing do to lack of lube.
Scott

 

I forgot to mention it's an open primary, so there is no allen plug to remove...!!!

 

My 65 and 84 I fill just below the bottom of the threads on the fill hole with the bike level. Been doing it that way since I got the 65 in 1970. Never heard of the "fill just about 1/4 inch above bottom of splasher"

That works well, but only if your bike has the allen plug on outer kicker cover.

 

the allen plug is on the kicker cover (when there is a plug, not always the case)

 

16 ounces

 

and 1 ounce of this in the tranny -- 4 ounces in the engine oil --- http://www.ebay.com/itm/Militec-1-16...0063e1&vxp=mtr --

 

Old style covers without the allen plug it is filled to the bottom of the threads. Later style cover fill until comes out of the allen plug hole. Both with the bike upright.

 

I have tried running my bike with a minimum of gear oil in the 4 speed transmission of my 1975 FLH and I have tried filling the transmission till it leaks out of the hole in the kicker filled by the allen plug.

The only thing running a minimum amount of gear oil accomplished, was to make me check the oil in the tranny before every ride.

I have torn down my bike for the last time to "fix" my oil leaking transmission. I am just interested in slowing it down, anybody have an idea about running 140 wt gear oil in the transmission? I currently run 75-90 wt synthetic gear oil.

I live and ride in Texas, and our winters are usually pretty brief and mild compared to the rest of the country. So cold temps affecting the heavy gear oil are not that much of a concern. If it gets that cold, the pick up truck looks pretty good.