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Posted by IRONDOG on January 6, 2008, 1:20 am
Bruce Richmond wrote:
>>
>>An outboard motor is a motorcycle engine? If that's the case then lets
>>lump some other 2 cycles in here, too. Be aware that Rotax two-cycle
>>snowmobile engines with Bosch energy transfer ignition (points) had
>>mechanical advance mechanisms as did any other Bosch equiped snowmobile
>>engine I have ever seen. And to be specific my 1976 Rokon 340 MXII has
>>aforesaid advance mechanism- and it *is* a motorcycle with a two stroke
>>engine.
>>Jerrywww.snowmobileswapmeet.comwww.dirtbikeswapmeet.com
> The key word here is magneto. Inductive ignition with points and a
> coil is a different animal. Magnetos do not generally use anvance
> mechanisms. Not sure but I think the reason is that it takes a lot
> more force to turn since it is the rotation of the mag that creates
> the electrical spark. With the points setup it just has to turn the
> cam that opens the points. The electricity is provided by the battery
> or the charging system. The higher force required by the mag
> overpowers the little counterweights of the advance mechanism.
>
> Bruce
Sorry Bruce, but all the examples I posted above (Rotax with Bosch,
etc.) have magnetos and also have advance mechanisms. It's not uncommon.
Jerry
www.snowmobileswapmeet.com
www.dirtbikeswapmeet.com
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