CB650F Help needed for left crank cover case leaking

[capenha]

Hi everyone,

I have a 2015 Honda CB650F that is persistently leaking oil from the bottom of the left crankcase cover.

I tried searching online to buy a replacement paper/rubber gasket, but it seems that for this specific 650 engine platform, Honda does not use a physical gasket for the left cover. The parts catalog shows nothing, and it seems it relies strictly on a liquid sealant (liquid gasket) which I've replaced twice already.

An official workshop has already attempted to fix this twice by applying sealant, but it keeps leaking from the exact same spot at the bottom after just a few days of riding.

My questions for the community:

Can anyone confirm that there is indeed NO physical gasket available for the left cover, not even an aftermarket one (like Athena)?

What is the absolute best liquid sealant to use for this specific cover? Should I look strictly for Hondabond 4 / ThreeBond 1207B, or is Permatex Ultra Black/Grey good enough?

Are there any specific torque specs or curing time tips I should follow to make sure it doesn't leak a third time? I suspect the workshop didn't let the sealant cure long enough before putting oil back in and starting the bike.

Thanks in advance for the help!

 

[Brammers]

Grab the service manual from the resources section. That has all the details you'll need.

I have resealed my 2024 generator cover for the same reason.

Can confirm it uses an RTV sealer and no "gasket".

I used threebond and it worked perfectly.

The left side has to real oil in it, but give the threebond 24hrs to cure before running the engine to be safe.

Use a wooden scraper to remove old sealant. Don't use anything that could scratch the metal engine parts.

J

 

[ghehen]

Both crank covers on the 650 series are prone to oil leaks around the areas where the electrical wires and sensor wires pass through after some time of use.

I replaced the 650R clutch assembly on my 650F, and while I had the crank cover removed, I applied fresh ThreeBond sealant around those areas. Since then, it has been rock solid and completely dry with no signs of oil leakage.

 

[Pete Croney]

Use Hondabond and follow the curing times.
Basically screw up finger tight and leave for an hour.
Torque in a star pattern but don’t start the bike for 24 hours.
It’s an easy job.