The $265 G62s have been on Ebay off and on all last year, sometimes as low as $239 way last year...Currently $265...Click on Ebay, go to Zenoah...The seller is Patmont Motors, maker of GoPeds...The G62s are NIB with no prop hub, maybe that's how he gets around Horizon Hobby.....
I have been converting G62s for 18 years, first with mechanical advance of my own design using a ball bearing mounted sensor holder ring behind the hub, connected to the carb with a link to advance the throttle...They weighed about 4 1/2 lbs..
Newer conversions use a lighter hub and syncro spark, weigh 4 lbs + a few ounces, depending on the lenght of the hub...
The engine runs the same with mechanical advance as it does with syncro spark, the weight difference comes from the stock hub and bearing VS the syncro spark and lighter hub...