crankcase gasket

[dreambike]

I have a 1966 CA-77 305, I had to take my crankcase cover off to access the clutch, and upon placing it carefully back on with a new gasket, it leaked. I never had a leak before. I spoke with the Motorcycle shop about it, assuming since they were handmade by this shop, and that I never had a leak, that this gasket was faulty. I called back, and ended buying a second gasket, this one leaks as well. I can't get any response from this shop. So, does anyone have a good reliable source for this gasket?
Thanks

paul

[G-Man]

There's not much that can go wrong with a gasket.

You need to carefully check both joint surfaces to see if there is any damage or burrs. Did you clean off all of the old gasket from both surfaces before putting in the new one?

Where is the leak?

These are genuine Honda Gaskets.....

https://www.davidsilverspares.com/CA77- ... art_51139/

G

I have a 1966 CA-77 305, I had to take my crankcase cover off to access the clutch, and upon placing it carefully back on with a new gasket, it leaked. I never had a leak before. I spoke with the Motorcycle shop about it, assuming since they were handmade by this shop, and that I never had a leak, that this gasket was faulty. I called back, and ended buying a second gasket, this one leaks as well. I can't get any response from this shop. So, does anyone have a good reliable source for this gasket?
Thanks

paul

[DJM]

As G-Man has suggested check carefully that the joint faces on the crankcases and the outer case don't have any damage, also that all traces of the old gasket have been removed.

Also check that the leak is actually from the gasket and not from the oil seal where the gearchange shaft come out.

At the factory these crosshead screws are put in really TIGHT, and it's difficult to get them that tight with normal hand tools.

When I fit my cases I initially assemble them using hex socket bolts (allen screws)and tighten them up really tight using a decent sized allen key, leave overnight for the gasket to 'settle' and then retighten them.

Having done this I then remove the socket bolts, one at a time and replace them with the normal crossheads and tighten these as tight as I can get them with a proper T handle screw driver.

This works for me, it takes a bit longer but I don't get any leaks, if you are just using a conventional screwdriver you may struggle to get the joint oil tight.

A bit of gasket sealant will help but shouldn't be necessary if the joint faces are all good.

Just as an add on, the 6mm tapped holes in the crankcases are quite deep and you can usually use a crosshead screw one size longer than quoted in the parts book, this gives the 50 year old threads an easier time and will help to get a good result.