Ram500 starts are problematic. Once you get all the parameter settings dialed in it may start fine for a while, then all of a sudden it won't start. The settings are sensitive to the weather, how much pressure is in your gas canister and the ECU battery voltage. The gas pressure changes based on outside temperature, how recently you filled it and how low your Powermax can is getting. The other issue is that Ram's quality control was poor and any two engines don't necessarily act the same.

From your first post it appears that yours is lighting off fine, then you're getting too much kero too soon during the fuel ramp phase. It is difficult to get the gas just right. It seems that when you have it set for consistent light-offs you don't have enough to heat up the combustion chamber prior to ramping in the kero. If you increase the gas to get it through the ramp phase then it has too much gas for light-off.

After playing with mine way too much I found that the best way to start it is to keep the Powermax can connected during starts. Let it light off, when the kero starts ramping you will notice the rpm will sag a bit. At that point give it a shot of Powermax. One shot is usually enough to heat things up enough to get it through fuel ramp and start.

Always start with a fully charged ECU battery, leave the Powermax can connected, connect the data terminal so that you can watch rpm and EGT throughout the start. That will help you determine how much extra Powermax to give it.

Good luck,
Joe