BigBlue
Active Member
O.K.,
I have always wondered how the timing is advanced with the Happy Time/China Girl engines. I haven't seen a post on how the timing is actually advanced. I think the timing advance has something to do with the shape of the magneto.
Here's a video posted on YouTube demonstrating timing advance on a Happy Time/China Girl:
http://www.youtube.com/watch?v=8sKg6h9pDmw&list=ULFhvaNvT5NN4
I found an article on Silicon Chip Online about CDI modules for small engines written by John Clarke. The kit is sold by Jaycar of Australia:
http://archive.siliconchip.com.au/cms/A_110499/article.html
Figures 3 and 4 in the article explains how a stepped trigger coil can advance the timing of the engine. The stepped design is not the shape of the coil in the Happy Time/China Girl engines. However, it is the shape of the magneto. Rather than stepping magneto coil, the Chinese shaped the steps into the magneto to get the timing to advance. The engine case is just too small to fit a stepped magneto coil.
Here's a picture of a magneto and see the stepped design:
Of course I don't know if what I am saying is true or not. I am electronics illiterate and mechanically declined. Maybe I am seeing something that isn't even relevant.
Maybe someone with more experience can contribute.
Chris
AKA: BigBlue
I have always wondered how the timing is advanced with the Happy Time/China Girl engines. I haven't seen a post on how the timing is actually advanced. I think the timing advance has something to do with the shape of the magneto.
Here's a video posted on YouTube demonstrating timing advance on a Happy Time/China Girl:
http://www.youtube.com/watch?v=8sKg6h9pDmw&list=ULFhvaNvT5NN4
I found an article on Silicon Chip Online about CDI modules for small engines written by John Clarke. The kit is sold by Jaycar of Australia:
http://archive.siliconchip.com.au/cms/A_110499/article.html
Figures 3 and 4 in the article explains how a stepped trigger coil can advance the timing of the engine. The stepped design is not the shape of the coil in the Happy Time/China Girl engines. However, it is the shape of the magneto. Rather than stepping magneto coil, the Chinese shaped the steps into the magneto to get the timing to advance. The engine case is just too small to fit a stepped magneto coil.
Here's a picture of a magneto and see the stepped design:
Of course I don't know if what I am saying is true or not. I am electronics illiterate and mechanically declined. Maybe I am seeing something that isn't even relevant.
Maybe someone with more experience can contribute.
Chris
AKA: BigBlue