What did you do to your Yamaha today?

Are you thinking about using the O2 sensor for just tweaking the idle mixture? Or are you thinking you will do some rejetting? Just curious.

Each individual header pipe has a test port of some sort - any way to use those so you can measure each cylinder individually??

Edit - I see you have an aftermarket header, so nevermind the question about the test ports on the stock header pipes. Although it did get me thinking about maybe taking some crusty old header pipes and having O2 sensor bungs installed on them.

 

Just want to dial-in the mixture as a whole using a wideband and to get a feel for what's going on during the 6k bog. Don't need exact numbers just a snapshot.

 

It's what I'm doing on my GS850
One bung just after the collector, Scorpion gauge and wideband Bosch sensor.
But... I'm only using a single carb. Doing it with multis is more problematical.

 

That's okay Ive been called problematical all my life.

 

Spent a couple of hours tig welding the corroded away threaded corners by the camchain tunnel on a set of xj900 jugs. Took a bit of sussing out and preheating. Now in the process of machining the blobs away to original shape. Before drilling and tapping.
Will it be worth the bother? It's likely to be 6 hours of workshop time, so not likely with the low cost of good replacements, but good to know it's doable.
Big thanks to @Franz for supplying them, the 900 engine I have is an unknown, so who knows if I will use these (they look to have very little wear).

 

The engine had 34,000 miles on it when I got the bike.

 

Got a pic here..

 

Looking a lot better already.

 

No riding in the Midwest till the roads are cleaner. Unless the bike has on/off tires. I am also on the upper end of the age scale, so if I went down, it takes longer to heal. You enjoy that ride, it sure is tempting.