Grime in Valve Cover

[Rich82GS750TZ]

Good. I could be wrong on this but but I don't think there should be any pressure at all in those vent tubes / Ts that gang the carbs together. The tubes are, after all, left open in still air. Someone may have a better idea on that.

Orings: If you bought new orings to rebuild your carbs from anyone other than Nessism, I'd definitely hit him up and get yourself a set.
If you didn't follow the tutorial written by the same when you disantled/rebuilt the carbs, you may want to have a look.

https://gsarchive.bwringer.com/mtsac/~cliff/storage/gs/Mikuni_BS-CV_Carburetor_Rebuild_Tutorial.pdf

[Rob S.]

Well it may be time for me to throw in the towel. 2 weeks and many a dollar on tools, chemicals, and parts later I'm actually at a worse place than where I started.

Hey - we don't allow any towel tossing here!

And you're certainly not in a worse place than when you started. Aside from the lovely new tools, nifty chemicals and new battery, you've got experience. And "it's always darkest just before..." something or other. You get the drift. Hang in there.

I can't type anymore, it's too dark in here.

[stossboss_gaming_and_news]

Thanks everyone for your help & encouragement. I replaced those o-rings and noticed one of the needle jets wasn't properly seated so I fixed that, double checked all the passages and float heights, the 2.5 turns on the air-mixture screws, changed oil (i was happy to see people deem rotella 15w-40 worthy as thats what my 190d uses too ), prime -> choke on -> it started right up, not even any need for starter fluid. It even idles well without any choke, which was never possible since I purchased the bike. A lot of smoke coming from the front of the exhaust which I think is from debris after sitting out all year without that part well covered.

I do think what @Rich82GS750TZ said was right in suggesting those vent o-rings probably weren't the ultimate factor (although I could have misinterpreted) but that and reseating the one needle jet is all I really changed within the carbs - so most likely it was air-mixture screws?

Next I'll be adjusting air-mixture and tuning as it feels to be revving quite high, although I can't actually investigate without a working tachometer - I dont know what you would call the part, but the sleeve that houses the inner tach cable and connects to the tab in the valve cover appears to have compressed (possibly by me when removing it) which damaged the cable, so gotta get that but all-in-all I'm quite relieved. and also - fork oil, brakes, and fixing my horn button contact and it should be good to ride

And thanks again!

[Rich82GS750TZ]

Awesome. Great job!

[Rob S.]

That's what we like to hear. Aren't you glad you didn't do anything foolish with that towel?

See if next time it will start without prime. It shouldn't be needed every time (though the choke generally is).

[rphillips]

Congrats, doing good