85 Honda Big Red...whats the best gear oil?

[BigRedRider85]

I want to flush the old gear oil out of my 85 big red and freshen it up.....is the pro honda hypoid 80w90 ok to use?

[honda4h]

yes that's good hypoid is what is called for

[dustrunner]

ya, thats what i use... never had any problems...just keep the water out of it....

[Thorpe]

Thats what's in my sx and es....

[tri again]

I've been putting pencil eraser sized 'neodymium' magnets
on all my drain plugs to catch metals.

It's only 3 point three ounces so easy and cheap to change that oil.

[cosmohawk]

Just remember to not over-tighten the rear-end filler cap on the diff.
I snugged mine up a bit too much and it cracked. Never understood these Honda caps...same ones used for the valve inspection covers on the dirtbikes of the same vintage. VERY flimsy...and tend to fail.

Have considered having a new cap machined out of aluminum...something beefier.
Anyone out there know where to get a stronger cap (if one exists)?

[BigRedRider85]

thanks for heads up cosmo

[dustrunner]

Never understood these Honda caps...same ones used for the valve inspection covers on the dirtbikes of the same vintage. VERY flimsy...and tend to fail. = so we hafta buy new ones..