ORIGINAL: bjr_93tz
I'm just struggling with the idea that a slow flip on this OS engine would result in the CDI not sparking, I can understand this if the CDI is programmed to see a couple of pulses, calculate the rpm, then start firing which would mandate the use of an electric starter, but I'm not sure how the OS cdi knows it's going too slow from a single flip, not unless it measures the pulse width as well as frequency?
Anyway, not wanting to hijack a very interesting thread, I hope things sort themselves out as the more options we have in pattern the better.
No, no, it's not really the issue with the 33GT. Even a 95 pound weakling can flip the prop fast enough to fire the CDI....... 100 rpm equivalent flip speed is very low speed. The only time it will not spark on purpose is when one just turns the prop over or bumps the prop through a partial turn.
I had no real problem seeing the spark when I removed the plug and flipped the prop. Sparking could be seen with the SAP CDI, DLE CDI and ZDZ CDI in addition to the standard OS. That was not the problem.
After the first couople early great runs, it simply refused to pop when flipping by hand, with any CDI attached. I went as far as making an adapter for a different carb and changed the carb to one I knew worked great, and still nothing. Then Ed assisted me with a starter and we finally got it going, but it had no power acting extremely lean. Obviously something else was wrong. I really hope hobbyservices pinpointed the problem with the alleged finding of a cracked backplate.
How they were able to make the engine run great, twice, with a cracked backplate, is beyond me!! But I am patient and I'll see for myself how it works once it's returned. Folks, I tell you this much, this is by far the strongest engine in this size I have run (I've run the SAP180, Mintor 38, ZDZ40, and have seen the DLE30 run)....that's why I am still so interested and frustrated at the slow progress