GS850 smoking from 3 - 4 cylinder

[Guest]

hello, we are lightly restoring gs850g, after cleanup, carb reassembly and other few things the bike start smoking from connection pipe under engine.. but is start smoke only after warmup, its not smoking immediately after startup, only when it runs for a while.. you can check the video.

compression is ok, on both cylinders is around 100, which is limit, but I have only cheap meter.. If I drop oil directly into cylinder the compression is aroud 120.. so i guess maybe valve stems? or seals..? but bike is running great and Iam not sure if smokes before i pulled carbs out or not.. but we didnot touch the engine, just polished few head bolts( I will tighten them corectly tommorrow.

should it be head gasket..?

please chech the video

https://www.youtube.com/watch?v=EG9eiFGqb0s

the bike doesnt sound that bad, thats my microphone on my cheap phone

[Big T]

Not the head gasket
It would appear that the bike is missing the gasket on the connection pipes, as nothing should come out there
Did this bike sit unused for a time?

[ondrejcervinka]

yes, the gasket is probably bad. but there should not be smoke from exhaust.. I dont know where the smoke goes.. that is the question

[standswithabeer]

are the spark plugs wet w/oil on #3 and #4 ?

[Wingsconsin]

This can be fixed

Seeing a puff of smoke like this from my GS850GL was what helped me to finally chase down the noise I had --
I had a ticking sound I COULD NOT find --
Then one day my Son got on and when he started it -- PUFF -- same thing --
Once I figured out it was an exhaust leak my life got way better --
The gaskets connecting the header pipe to the exhaust box are likely bad (or missing)
New gaskets are available and once they are changed out the bike will sound better and no smoke.
It's a bit of a pain in the arse to do - but not difficult -
Take some time to clean and polish everything you take off before putting it back on ... my 2¢

ps: Mine was on the #2 pipe but all four got new gaskets