You guys mention the MAX9924.
I thought the VR conditioner uses the MAX9926
Using scope, like JHolland said:
You need change the voltage range so you can see the amplitude properly
Mess around whit settings until you get a nice picture on the screen.
I post a picture of one of mine scope screens, it is a dual channel but focus on the green channel.
What is the value of your tuning potentiometer ?
I now you like the bike be sequential on its fuel settings.
But it might be better to focus on the crank sensor only and if it works right change to sequential.
I still think your bike could be running on whit an vr sensor.
Do you use a screened cable to the speeduino ?
And where did you connect the screen ?