Got another longer ride in today. Took a trip down 60th street heading south (Karl will know) and rode past the scrap yards and made a loop back around. Maybe 5 or so miles in total. Still didn't give it the beans or test it on any steep hills, just taking it easy and enjoying the ride. It happily runs along at 30mph at around half throttle and 5500rpm-ish according to my bikes GPS speedo - which I verified it's accuracy with my car and phone. Still have a touch of 4 stroking that pops in and out at part throttle. Hard to tell if it is from being a bit rich or if I need to mess with the ignition timing. I got home and let it cool off and retarded the timing with the slop in the magnet to see if that will help, but then the rain clouds are starting to roll in.
Observations. This is definitely a hot running motor. The thermostat on my tachometer, assuming it is accurate, peaked over 300 degrees at the head at one point and I wasn't pushing it too hard. Ambient air temp was about 70 degrees. I didn't help things by removing a base gasket to decrease the squish gap. I do know that it will run a hair hotter than normal during break in, but even if it started running cooler after break-in is over I would want to be cautious about pushing it hard on a hot day for sure. To its credit, it did maintain a decent temp while holding a steady speed of 20+mph, so at least while cruising along at higher speeds it seems to do alright. Definitely not a good motor for puttering around at lower speeds.
I will say this. Even during break in, and at part throttle, this motor is easily 2-3 times more powerful than the first motor I built those years ago. Very different animal. I love the power for sure. I just hope I have managed to work in some reliability with that power.
Observations. This is definitely a hot running motor. The thermostat on my tachometer, assuming it is accurate, peaked over 300 degrees at the head at one point and I wasn't pushing it too hard. Ambient air temp was about 70 degrees. I didn't help things by removing a base gasket to decrease the squish gap. I do know that it will run a hair hotter than normal during break in, but even if it started running cooler after break-in is over I would want to be cautious about pushing it hard on a hot day for sure. To its credit, it did maintain a decent temp while holding a steady speed of 20+mph, so at least while cruising along at higher speeds it seems to do alright. Definitely not a good motor for puttering around at lower speeds.
I will say this. Even during break in, and at part throttle, this motor is easily 2-3 times more powerful than the first motor I built those years ago. Very different animal. I love the power for sure. I just hope I have managed to work in some reliability with that power.