Pt2: Vintage 1981 Honda CB900C Engine issues diagnosis 6600 original miles, tear down begins

[@Joe_Not_A_Fed]

Same thing happened to a 1981 CB900c of mine...a chip off the old exhaust valve. The gasket looked fine with no sign of being blown, as did the other valves. No damage to the cylinder. I don't think mine was running overly lean, judging by the color of the spark plugs...and the smell of the exhaust when going down the road. I have the Hondaline fairing and bags, and that gives me a whiff of the exhaust on occasion. It definitely had that 'more rich than lean' odor. Most of my exhaust valves were too tight, tho all had some gap.

[@thedragon2299]

I found out it actually melted and didn't break off. Check out update kzbin.info/www/bejne/n6fZoHaZiLOjb68

[@Joe_Not_A_Fed]

@@thedragon2299 I'll check it out. Thanks.

[@rodofsteel6662]

Kaplan cycles always say they have to micro drum the jets because those bike always run lean. My 81 cb900c is lean and valves might be a problem. The Rpms hang around 5000rpm and slowly go down if I rev the bike a couple time, now this only happens when I have the clutch pulled in at a stop.

[@thedragon2299]

Yeah, I have heard many stories about burnt valves in these bikes. Yours does sound like a lean situation there.

[@fabieneldridge3414]

Good video. Looks like you might have got lucky. If the heads are okay you’ll be rocking from the looks of things.

[@thedragon2299]

kzbin.info/www/bejne/n6fZoHaZiLOjb68 You may have seen this by now, but the owner decided to go with a better head.

[@milk_420]

watch out for that starter