For the sake of sharing for those on the fence about engines ....

I like what I got so far ! I have been breaking in a B5 pro on a x ray xt9 truggy and I am to the point where I am letting the temps get above 220 Dg and things have gone great . Starting to see the power potential in this lump. This engine has only flamed out 2 or 3 times early in the break in process, 4 stroken fat as a cat on the box for the first tank or two. It has not burned or fouled any plugs. It has always started first try on the settings I left on it from the last session. It stays running well upside down for plenty of time and doesn't flame out when you finally get to it to flip it over . It doesn't hunt for a idle. It restarts easily after running out of fuel and refilling it . Even running fat its good power for my truck. I'm just digging this thing so far.

When its cold though , the bump box cannot handle it without a heater of some sort or backing the plug out . But I guess that's to be expected.