Never had one, but I have had 5-6 Zens and just broke in my RCMK Evo today. I run for 5 minutes each time and mix Mercury Marine Quicksilver at 8 oz per gallon for break in.
1st run- I work in the low to mid range Rpms never staying at the same throttle for more than 4-5 seconds. I leave the needles a little on the rich side....Decent bit of smoke. Bring in and let the engine cool for 15 minutes
2nd run- After checking the plug, I run again in the low to mid rpm for 5 minutes. Maybe a couple high end rev's. Bring in and let cool for 15 minutes looking everything over, especially the cooling lines.
3 rd run- Start to work in the mid to high RPMs. 5 minutes, bring and let cool
After that, I will lean the needles and run in the high RPM range. After 5 bag of gas, I will let it go WOT for 4-5 minutes.
At about 3/4 gallons of gas through the engine, I switch to Honda HP2 oil (sythetic) and let the engine loosen up over time. Hope this helps.
