ORIGINAL: armody
6. Last question does break-in apply to all the 2 Stroke engines same way.
Nope
Engines come with piston/liners of 3 basic types SEE [link=http://www.mecoa.com/faq/abc/abc.htm]CLICKY[/link]
An ABC or ABN or AAC Engine needs to be at normal operating temp ASAP
A ringed piston engine can get by with cooler operating tempretures but needs the ring to get bedded in over a period of time..
A lapped cast iron piston running in a steel liner needs a longer period of running in then either of the above.
Please note that running in practices often result in very heated arguments amongst modellers. There are some long threads on RCU about this. A search should give you an evenings entertainment.
Do note though that ONE LEAN RUN resulting in a higher operating temp can ruin a piston and liner. Get your local engine guru to alert you to the sound of a lean run and a "sagging" engine on its way to an early grave.