Topic: wideband O2 working! or is it? it is!

[PeWe]

Dyno with A/F meter make it easier. I found the needle setting of my TMR32 with help of a dyno run, slowly increasing throttle on 5:th gear from 2000- 6000 rpm.
Way too rich so I knew what to change. 1 step felt better but still wrong, 1 step further leaner and it felt right. Verified at another dyno visit

I verified main jets earlier this year when I changed from 4-4 to 4-2-1. WOT (around 200 kmh), slowly reduce throttle from WOT, if it  accelerate, more fuel 
I was very close to enter a car from behind so Dyno is better!

I have struggled with pilots and fuel screws for a while. Replaced coils fixed it so I could start over with various pilot jets.

[maxheadflow]

Some if the HD guys put these block in the head pipe to sample cylinders.   They drill a small hole and use a rivnut in the hole. The screw holding the block in place has a hole through the center of it.. IIRC these are called Herko blocks after John Herko...

 

[Don R]

 That's awesome. I'm not willing to drill my 4-4's but would be willing to on any of a number of 4-1's I have. Given the limited amount of time I've spent on it I know my #1 carb is way rich as evidenced by the O2 meter and the gas fouled plug. (2 in a row).
   First off, I'll prove the #1 fuel level is correct, these carbs have haunted me for a long time between hanging floats, grit in the gas and etc.  Earlier I dried the tank and inserted a leaf blower through the gas cap and a reducer, then cleaned the float valves and bowls again. I'm confident any grit is gone with the wind.

[turboguzzi]

might apply to you... was chasing for a long time some intermittent bad running on my kz750 with VM26. At one point it started fouling fouling plug nr2, still couldnt find the fault, was driving me crazy. turns out the grub screw for the choke arm for that carb was a bit free so plunger was not returning fully when i closed the choke. sorted that, gave all choke plungers  a nice greasing, runs sweet now....

[Don R]

https://photos.app.goo.gl/XqtRoDuGNnbNyXDH7

 Crazy animation of the rich #1 cylinder. I since adjusted the float level and it appears to be cured.