I remember that powered pogo as well & would definitely buy one now (at the original pricing) just to see how it was constructed. As a charter member of the "Danger Rangers" I'd probably try a ride even at my age, but that would certainly be ill advised. Some of that back page stuff had to be dangerous!
Butch I'm really looking forward to receiving the frame today and pulling together the design plan for the Cg 125 5 speed mated to a Flyer frame. I'm not aware of any build thread on such a combination and that rather surprises me. Forum members please correct me if I've missed such a thread. Wret built a dandy CG150 in a loop frame of his own design, other than that the use of the 5 speed CG Honda family of motors is scant.
These CG motors are vertical, with integrated 5 speed wet clutch and kick starting (electric option) ranging in displacement from 50cc to 230cc and have real charging for 12 volt systems, lighting & accessories readily available...designed specifically for this motor. Weight is about 55 lbs. not excessive and advertised power varies on the Cg 125 but 11 to 12 hp seems to be close. Cam is mild and my Simplex is happy to smoothly purr at 10 mph in 3 rd. & I could lock it in that gear full time as it pulls from a dead stop quite easily in third and have enough speed to get me a bad ticket even on county roads (40 mph limit). Engine requires room so loop frames or custom construction are necessary. Engine is 17" H X 14" L x 13" W. On the Simplex I increased height by 4" and lengthened it by 6" & it just barely fits. I expect that even the Flyer frame will require alteration, but since it's based on the classic frames it lends itself to "easier" motor mount solutions. The CG motor has 6 well placed attachment points located 2 forward, 2 aft, motor base & head. No need to use a head or case bolt for support as these are all factory supports designed for the purpose. Steve pointed out that the engine is a bolt on and use unit and that is basically a correct insight for the motor. Motor & pedal drive train design is a bit more work but no more so than using a Predator. If you can set up one then the other is a close repeat.
One thing that needs addressing is the proximity of the pedals for utilizing the shift lever & brake (if one uses a coaster as I do on the Simplex) left pedal down & level with the shift peg may require an adjustment of pedal length & or modification of the factory shift lever. On the Simplex I had to do both: shortened the pedals and lengthened the shift peg.
Overall I think the CG motor and the Flyer frame is good match and a build that doesn't require a great deal of skill to assemble into a really solid driver, one which can be built at reasonable cost of both time and dollars. Of course you can spend a ton of time and money tweaking any machine to suit, but a basic build shouldn't break the bank. Rick C.