RE: ST 40 Gasoline CDI Ignition
The weather in Houston/Spring was absolutely beautiful today. I flew the Sportster 4 times each lasting about 11 or 12 minutes. It ran perfect and the only adjustment was one click in on the main needle as the temp warmed up. It was 44F when I left the house and in the 70's by 1:00. The last run was around noon and I leaned it slightly for that flight. That was the only time I touched it. I did learn it is a little cold natured when the temps are that cool. It took 8 flips with my finger on the carb to choke before it would even burp. Two more with the ignition on and choking and it fired. It died almost immediately and rechoking it got it going again. This time every couple of seconds it would start slowing down like it was wanting to die so I would place my finger over the exhaust for just a second and it would pick back up. Two or three times of that and it stayed running and I slowly increased the throttle to about mid and let it warm for about 10 secs. After that it throttled nicely and started easily and ran great the rest of the day. If it sat less than 10 mins between runs I didn't have to choke it to restart. It is running very strong and not making any unusual noises so I think the teardown and inspection will come later. It's hard to justify when nothing appears out of order. I ran it wide open almost the entire flight each time and running this way it uses more fuel than the earlier flights but still very little compared to 15% glow. All total today I burned 14 oz. The plug still looks great and is apparently in good shape since I have easy starting and no misfiring at high rpm's. With the recent increase in glow fuel prices this is not going to take long to pay for the cost of the ignition system. Gas and oil have cost less than a dollar so far (I have burned less than a quarter gallon at 2.75 per) and on 15% glow I would have burned close to a gallon by now costing about 20 dollars.
Pe, if you are still following this thread, it requires adjustment when the temp., baro pressure, or humidity changes significantly. It's not as consistant in that respect as a good walbro or zama (such as on my G26) but it's certainly no worse than when it was on glow.