crankcase breather

[motobroker]

Does the CL77 have any crankcase breathing outlets besides the one at the top of the engine?
It seems kind of small. Are there any mods to help with better breathing?

[LOUD MOUSE]

That is it and it worked for 1,000's of them. ............lm

Does the CL77 have any crankcase breathing outlets besides the one at the top of the engine?
It seems kind of small. Are there any mods to help with better breathing?

[G-Man]

Motobroker

The CL77 is a 180 degree crank engine so piston pumping is cancelled out, unlike big british twins which generate a lot of pressure pulses in the crankcase (both pistons moving together). The small breather at the top of the engine is sufficient for these engines in normal use.

Earlier versions of the C72 and C77 had a breather tower at the back of the top crankcase cover which breathed out onto the final drive sprocket but this was deleted around 1962, in favor of the later arrangement even for the 360 crank engines.

G

[mrken305]

There's a picture of an aftermarket racing crankcase breather in the Forum if you search for the keywords 'Whistling Wanker'. They were made by Webco back in the 60s. Since they are rare and somewhat odd looking, this info may not help you much.