Yes my Magnum 120 FS operates OK but simply lacks power. Have checked everything from timing to valves, fuel lines, glow plug etc. Have passed 2 gallons of fuel through it till now.

I have broken it in as per instructions and now enjoys tons of compression. Is is really impressive how well holds compression as turning the prop by hand. It idles also all day long at 1,800 rpms. But as for peak power it only gives 7,900 - 8000 on MA k-type 16x6.

It is also oil messy (spitting fuel from the carb) while YS 110 is the cleanest engine I have ever run.

Stelios