ORIGINAL: Supercheap
I use a starter so it always starts in the right direction. It can hand start, just got to make sure you give it a good flip. I will check the ring gap. I have another echo engine, I am not sure of the displacemennt though. Does anyone know what this engine is? I have a couple engines that could use some new rings. I have heard a lot of good things about Bowman rings. Does anyone have his contact info. Thanks
That looks like an older 21cc engine to me.
The Echo engines usually have a decal on the block, stating a model number. A "2000" or "2100" is a 21cc engine, a "2400" is a 23.6cc engine, a "2500" is a 25cc, etc. The older 23.6cc engines are the best, but they all run well.
If you don't have a decal for some reason, you can easily measure the bore and stroke and then use this formula:
(bore x bore) x stroke) x .7854 = displacement
If you measure in inches, that will provide you with the cubic inches of the engine. If you want to know the "cc", just divide the cubic inch result by .061 to get "cc's".
AV8TOR