Main Motorcycle: 2004 Thruxton
Join Date: Jan 2008
Location: Grand Rapids, Michigan
Other Motorcycle: 1954 BMW R25/3
Extra Motorcycle: 1971 CB350
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The LM2 has the ability to record rpms, throttle position (if you want to), and so on.
I started using the rpm feature, but in the end just went with fixed throttle openings, which is more important really. I did have some difficulty logging rpms, which can be very noisy on the LM2, it was a common complaint for a long while, but I haven't checked the innovate forum for a long while.
So this is why I say that the more simple gauge is every bit as good. I have datalogged some rides, just to look at how the a/f ratio changes during normal riding conditions, it's quite useful for that, but to set the carbs up you need to know what throttle opening you are at anyway. I'm not nearly as thorough as pieman, but thorough enough, I suppose.
Well, to be blunt, I'm stubborn and cheap. Until fitting the big-ass D&D full system, I was fine with the A/F readings I was getting from my local dyno and the power curves confirmed what I was seeing on the A/F plot. Now the bloody exit holes on the D&D pipes are so big, the sniffer-up-the-bum method used for EGA on the dyno no longer gives me the right story...backflow into the system is skewing the A/F readings.
So now I either need to measure A/F at the O2 sensor ports using an innovate-type setup or work in the dark and go entirely on power output on the dyno....the latter of which works fine for main jet sizing, but gets dicy when trying to figure out part throttle conditions.
Anyway, more than you probably wanted to know or read!
Cool. Thanks for the full story, Prop. I was leaning towards getting one of the DB gauge kits with the LC-1 controller and just wanted to know if I was leaving anything I needed on the table by passing on the LM2 unit. In my case, I like being able to mount the unit up like a permanent install...though I likely will only keep it on the bike until I've gotten the carbs sorted to my satisfaction.
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