I didn’t want to GPS it until I got a different spark plug. It was detonating with the protruded plug. Still stock gearing, getting all the miles per hour out of turning higher RPMs. It’s going flat on top, not fading away, which likely means I need to drive more heat into the pipe. So I will retard the ignition to drive some heat into the pipe. I have a bigger rear tire which should give me a couple MPH.
I am running a B8ES plug with an Airsal head, premium gas, I can still hear some occasional detonation, but with the switch to premium gas and the B8ES, I am not seeing evidence of detonation on the plug electrode. I have B9ES and B10ES plugs to try. Temperatures on the head are peaking at about 386F, which I know is high. I am using a Trailtech head temperature gauge from treatland.tv to measure the head temperature. I think I am going to experiment with E85 anyhow, so I will leave this combination.
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