Air leak on right side of engine, near spark plug hole?My scrambler had this problem for 15 years after a "professional" rebuild. After I broke a ring and decided to rebuild the top end I discovered the fire ring was missing. I had new barreles bored and pressed into my old head and bought a nice Cometic head gasket. After reassembly, the oil skull leak was gone. I suppose your problem might be the sleeves dropped allowing oil and pressure to escape past the fire ring. I don’t know if this is a possibility but maybe you could try a re-torque on the head bolts.
'67 CL77 (337, gears X'd)
'65 CB160 You ran it with that problem for 15 years? How? My right side plug is white, I suspect from an air leak, is it really just oil leaking? Seems like you shouldn't be running it like that.... I can hear the leaky cylinder, must be some lost compression here. What's the "fire ring" and what does it do? Is it possible to salvage the aluminum cylinder and head/valves and just replace the iron casting inside these parts? That would make a replacement much easier I suppose. I'll try a re-torque I guess. Whatever, couldn't hurt, right? Mine was the 3rd type with bubbles. I never saw puffs of smoke but noticed smoke when I stopped with the engine up to temp. I guess I wasn't losing enough compression to make running conditions dangerous to the engine.
I tried the pinging with a center punch but that didn’t seem to help. Let it be known that although I don't currently see any seepage, I have only put on less than 100 miles since the rebuild so I'm still crossing my fingers so to speak. The fire ring is the metallic ring on the head gasket that compresses as you torque down the head, closest to the combustion chamber. BTW, in 15 years I maybe put 1500 miles on it. Some in the mountains though and I ran the snot out of it no problem up to timberline anyway. '67 CL77 (337, gears X'd)
'65 CB160
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