My post relied heavily on a link, but anyway-No link no posts
The problem is that there isn't a whole lot of space under the magneto cover to add much weight. Still, look how small and light the rotor is compared to those of typical small 2-stroke bike engines. It shouldn't take much extra weight to make some difference.I would start by getting some weights of existing flywheels.
Thanks for the input, RecycleBill. The same thought crossed my mind. The problem, however, is that then the flywheel would need to be much heavier if it came after the 4.1:1 engine-clutch reduction. The ideal place is on the crankshaft itself, for best effect.It might be that you could add weight to the clutch assembly and get the same effect as a heavier flywheel.
Thanks for the input, RecycleBill. The same thought crossed my mind. The problem, however, is that then the flywheel would need to be much heavier if it came after the 4.1:1 engine-clutch reduction. The ideal place is on the crankshaft itself, for best effect.
... Steve
Hello Tom. I'm not sure just how I'll do it yet, either, but I'm sure it's possible. I have a crude sketch for a first attempt attached. (Not scale or even in proportion.)I like the concept but I can't visualize how you will mount a larger rotating mass and still incorporate the magneto coil and core into the equation. I recall older 4 stroke motors with the flywheel being hollow on the inside with the magnets embedded into the inner circumference of the wheel and the mag coil surrounded by it. Is this what you have in mind? Brass would probably be good its weight to mass is high. Keep in mind also that the crankshaft diameter at the rotor is very small, about 5/16". Any unbalanced condition could seriously effect things there. Keep us informed.
Tom
Lucky boy!I already have fast acceleration with my bike and i have no bucking or surging and my bike runs smoothly. but i weigh only 120lbs.
That does look interesting. For test purposes, it's just what I need. (Beats buying a second std cover and modifying it, from a practical poit of view.) Not a bad price, either, at $20US. Trouble is, postage to Australia will add about $35AU to the cost - total about $58AU.LOL, I weigh about 140 and I don't have those problems either.
Are you thinking of attaching this flywheel under the nut that holds the magneto rotor in place? That is definitely doable, that is the way that pull start assemblies attach. Now that I think about it, the cover from a pull start assembly might be just what you need to give you extra room. Here is the only site I know of to get one, and they seem to be out of stock again. But you can see what I mean about extra room.
Actually, mine's about the same for bottom speed, 12kph, despite higher gearing, but it is a 66cc. (44T, stock NT carb, jetted down to #76 when speeds were last measured.)Yes, it would be nice. I remember when my engine was first breaking in and I was using the standard carb (I use a CNS now) I couldn't run smoothly below 15mph. Now I can do as low as 6 or 8. With an absolute top-end on flat ground of 28mph (48cc, 48T sprocket) I'd say that isn't bad, but having more speed range would be great. What interests me most is the clutch take-offs. I can do them now, but with a lot of clutch squealing and engine lugging to get up to running speed. I usually just peddle to get moving and save the clutch pads.