I am quite possibly the worst engine tuner in the world. No engine of mine that I have tuned with a tach and instructions has ever run worth a @#$% !!! In fact, usually after I mess with an engine, even the 70 year old men who have been in small engine repair for 55 years are baffled with what I've done with the engine and can only get it to run poorly. No needles is a blessing for me. I have a DA 50 that won't run for goodness sakes. Luckily, this engine mounts right up to the same holes and if it works as advertised, I'll be buying at least one more immediately.

BTW, I'm mostly deaf so I can't hear well enough to do much tuning. And using a tach just doesn't seem to tell the whole story well enough. I can hear burble and stumbling, but not the nuances. Basically I'm just a horrid tuner and EFI will help me immensely. Now, if we could just get rid of the servo moving the throttle arm, we would REALLY be spoiled!