That's what I'm thinking. The only thing in common with my old engine and this one (which both have high readings) is the reed valves. I've used it on my 2 stroke piston port wheeler and my 4 stroke motorcycle with no problems.
A Reed will not cause high compression. It keeps the crankcase under pressure until the upper transfers are open and then the.cylinder fills. Overpressure in the chamber will bleed out the exhaust, and even with a pipe working in its ideal range won't force that much pressure into the cylinder before the exhaust closes.
That's what I thought, but I can't think of anything else. I guess it's just an inaccurate reading.
Or your phantom somehow has some hellacious carbon buildup in a very short amount of time.
You don't need a wide open throttle for the plug chop. If you know what speed you like to ride at, lets say 7500rpm, then ride at that speed for a sustained length of time. 5 minutes should do it, then kill the engine without throttling down. Now check the plug, that will give you the best info on your cruising mixture.
You should get your gage verified. Carbon build up will cause detonation because the carbon will glow red hot and ignite the fuel before it gets compressed.
Throttle position really doesn't matter with a proper plug chop anyway. You should be hitting the kill switch and pulling in the clutch at almost exactly the same time.
www.bicycle-engines.com
Doesn't that sound like the original "Trick or Treat"...lol...lol.
