Rough idle followed by no start after oil change.

[Zack]

the float that I took off doesnt move the same as the others now.
The others you can gently push and feel it compress, but this one swings freely for the most part now.
Also the screws on the bar that holds the carbs together wont come off even with my impact driver, at this point I may have to just conan it with the carb cleaner and hope for the best.
I dont think those screws have come off in 44 years..

EDIT Testing by pouring carb cleaner into main fuel T I get dripping out of all 4 carbs, with the strongest stream in carb 2 and 3. Those are closest so that makes sense. If I spray it hard it will come out of all 4 so I think we are good to atleast test it. Fuel is able to get to the bowels.

[Zack]

Put everything back and got it started, and it idles!

[kjsamm]

[QUOTE=Zack;2062845]Hello, so after a lot of work I was down to my last few things that my 1980 GS850 needed.
I drained the horrible oil last night and let the loctite for the drain plug to set overnight. I also changed the oil filter.
This afternoon I put new oil in ( a little over 3 and a half quarts of 20w50 valvoline) and a new choke and clutch cable.
After everything was back together and tight I started the bike, and it would not stay on without some choke or throttle and then proceeded to die after a few minutes.
It wont start for anything now and makes a noise I haven't heard before..
The bike was NOT started before I had the new oil in.
I'm at wits end here, after everything the last thing to do before I could ride it and now it wont start!
It started fine with the old nasty oil, sheesh..(wasnt ridden but would start and idle fine)
I'm hoping it's something stupid but I haven't figured it out yet. Please help [/Q

Am I the only one that caught that?

[The Artful Bodger]

Might be an obvious suggestion but................... Is your vacuum pipe for the fuel tap (petcock) ok. If it's off or split this will give you a strange noise (air puffing) cause strange running and the bike will stop running when the carbs run out of fuel?
Colin