My current build is nearing completion. All components are mounted and the drive train is mostly debugged. It's nicely rideable as an ultralight motorcycle, no pedaling needed in most situations. It pulls away from stop easily in 1st , and top speed in 4th is around 32 mph, plenty for local traffic. Lack of neutral is annoying at stop lights.
The motor is a 2009 Skyhawk2 "80cc", box-stock except for mounts and carb. Reliability is more important than performance at this stage of development. Once it's stable, I'll probably add a big-fin head and better exhaust.
The most serious remaining problem is a violent chain oscillation and surging in 5th gear, which I think results from that specific set of sprocket ratios. There's no trace of this issue in the lower cogs, and I've locked out 5th and higher for now, to prevent damage.
I'm also having to deal with the usual chain stretch/adjustment with the SBP shifter kit. I just-received a 1G8 chain for the jackshaft, which should help. I also need to add some reinforcement pieces to the SBP frame, because the metal they used is mild steel and shows some bending distortion at the mounts.
Comments welcome..
The motor is a 2009 Skyhawk2 "80cc", box-stock except for mounts and carb. Reliability is more important than performance at this stage of development. Once it's stable, I'll probably add a big-fin head and better exhaust.
The most serious remaining problem is a violent chain oscillation and surging in 5th gear, which I think results from that specific set of sprocket ratios. There's no trace of this issue in the lower cogs, and I've locked out 5th and higher for now, to prevent damage.
I'm also having to deal with the usual chain stretch/adjustment with the SBP shifter kit. I just-received a 1G8 chain for the jackshaft, which should help. I also need to add some reinforcement pieces to the SBP frame, because the metal they used is mild steel and shows some bending distortion at the mounts.
Comments welcome..
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