I have a LM-1 it is a great tuning tool. It gives me a/f ratio, rpm and can give me many other types of data such as TPS and CHT. You can use it to data log engine pulls and download the data to your laptop. You can overlay data graphs to compare differences your motor changes made to previous runs. You can also compare time to rpm point to see if the engine is rev faster, and making more power. Of course that only works if traction can be controlled, say a 3rd gear pull on pavement. It is the closest thing to a dyno. It does cost a lot, but dyno time cost money too. How many dyno sessions does it cost to reach $535? That is what I paid for the LM-1 with the rpm kit and exhaust adapter.
I have used it mainly on my stroked drag Raptor and my YFZ. I have not used it on my Banshee, mainly cause it is not yet running, it is in the beginnings of a 7mm Cub project. I does work on 2 strokes, and any fuel you can think of...gas, gas w/nitrous, diesel, alcohol, methane, nitro etc. They all just have different stoich points. I am going to get a seperate wideband sensor just to use with the two stroke, mainly for consistancy and oil does shorten life of the sensor. I will have to weld a bung on my banshee as the exhaust clamp is too big to fit on most banshee pipes. I'll probably get my pipes steel weld the bungs and then send them out for chrome.
Here is some info I got from Innovate concerning using the LM-1 on 2 strokes:
"The critical item is the mounting of the sensor. Oil droplets thrown at the sensor cause rich spikes of several seconds while they burn off from the sensor. They can even cause the LM-1 to error out with a 'too rich' error. We found it best to mount the sensor on the inside bent of a header. Centrifugal force tends to keep the oil droplets on the outside of the bend and the sensor is hit less by them. Also a longer bung is of advantage, designed such that only the very tip (rounded tip with small hole) is in the exhaust stream. Because of the oil the sensor lifespan is reduced."