2020 Superjet stock the plugs looks lean

[pioui1]

A friend came to the house with a 2020 Superjet with with low hours , he wants me to take a look at it, the compression is good at 170 on both cylinder, it runs great ,I decide to make a few spark plug test from low speed to high speed and I have a very good spot to check them, so I run for 700 feet at same speed and then I stop the engine ,

The stock Superjet seems lean, the pictures are not very good, I did not have my glass when I took the pictures ,
there is no adjustment screws on these carbs coming from the factory, the pictures are from the mid range, but the Superjet is running very good

 

[kevbo]

It probably is running higher than ideal combustion temps. This should be okay as long as good fuel is used and the exhaust is stock. Any modifications will require you to remove the adjuster caps for tuning.

 

[pioui1]

It probably is running higher than ideal combustion temps. This should be okay as long as good fuel is used and the exhaust is stock. Any modifications will require you to remove the adjuster caps for tuning.

thank you I will have better pictures over the weekend

 

[spinyard]

those plugs look perfect to me