As I just got done with a leak repair on my 81 G/S final drive I ran into some issues.
1) What is the correct amount of 80/90 gear oil to put in? The factory manual states .35 ltr or 350 milliliters however I found that the oil started coming out of the fluid level/inspection hole at the rear when I had about 275 to 300 mL in there.
2) The PO of this bike was really ham fisted and I have discovered the final drive fluid level plug/inspection plug at the rear of the drive is stripped. This is the 3rd stripped maintenance related threads I've found on the bike. What's best here? Helicoil or time sert? Do I have to split the drive open to fix this properly so as not to end up with filings inside or can it be done from the outside.
An Airhead buddy tells me I should never use that level plug (because they strip so easily and so many of them are already stripped).
He also said I should just put 320 mL of oil in there after draining even though the spec is 350mL.
I'm all ears on both subjects. What say ye?