engine runs fine..... but smoke?

[56cbr600rr]

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1972 cb350. I took the bike for it's first interstate run. Seemed pretty well. Had it a little over 80.

Anyways, when not in motion you can see that the left exhaust has a light colored smoke come out at idle. Also, it seems the left exhaust puts out a little more pressure than the right. Also, it seem the left side is a little hotter as well. Also, it seems the left side spark plug is slightly "wetter" than the right side as well... When I parked it in the garage after the ride quite a bit of smoke comes out of the crankcase breather as well while idling.

Valves are adjusted perfectly and timing/points are perfect. Compression is 169 and 174. Bike has less than 6000 miles on it. I'm guessing something with rings maybe.

-Anybody have any ideas??? should i open the engine??? Or should I run it for the time being and not worry about it?

Thanks!

 

[renegadmonk]

i have the same prob on my left side but the plugs arent wet...i get smoke upon initial start up which leads me to believe maybe the valve guide seals.....i had already planned on taking the head off this winter and having it redone..valves and all. Gotta remember those seals are over 36 years old (on my 72 engine) and bound to be in need of changing.

 

[sclay115]

Fun little tid-bit:

CB350 twin has no valve seals! The valve shafts seal against the guides. Which is why it's uber important to check your guides and replace them if needed(ask me how I know!) My engine smokes on startup, idle, and right after a rapid decel. All of those situations cause a high amount of vacuum in the combustion chamber, therefore, the lack of seal becomes more apparent. I continue to ride the hell out of mine. I have to top of my oil, often, very often. But I'm too damn lazy to pull that engine out again.

Steve

 

[renegadmonk]

Fun little tid-bit:

CB350 twin has no valve seals! The valve shafts seal against the guides. Which is why it's uber important to check your guides and replace them if needed(ask me how I know!) My engine smokes on startup, idle, and right after a rapid decel. All of those situations cause a high amount of vacuum in the combustion chamber, therefore, the lack of seal becomes more apparent. I continue to ride the hell out of mine. I have to top of my oil, often, very often. But I'm too damn lazy to pull that engine out again.

Steve

thats why when i finally pull my engine out to get the head work done the season will definately be over....who wants to stop riding when there is still some season left...LOL.