ORIGINAL: Tim_Indy
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Regarding kick back, it definitely could be a faulty ignition, but I've owned the BME 102, the 105, and now have a pair of the 110 Beemers, and the only time they have ever kicked was when I tried to start them and they were flooded (any engine will kick back in that case). You probably already know this, but that's the reason my starting procedure is to close the choke and turn the ignition ON, then flip the prop about 4 times until it "pops" or tries to start. It now has just enough gas in the cylinder to run so I open the choke and within 3 flips, the engine is running. Many guys choke their engine with the ignition off. That may allow too much fuel into the cylinder, flooding the engine and inviting kickback. My way lets the engine tell me when it has just enough fuel to start.
When I tested my BME 110 on the bench, I had a similar experience. I suspected I had a timing issue with this engine as well (see the link to the thread I sumitted in regards to timing concern). BTW those kick backs really hurt. I did not feel any pain on my hand, somehow the impact was received by my elbow tendons.
Tim remarks a good point, he describes the right way to start this engine.
[link=http://www.rcuniverse.com/forum/m_2956646/anchors_2956646/mpage_1/key_BME%252C110/anchor/tm.htm#2956646]BME Timing[/link]