during break in is it okay if it was driven gently and smoothly at almost full throttle but the rpms remained low because i was real rich?

it depends how low...and how far you are in the break-in.

lets say... about second tank, half rpm of what its capable of... would that be okay?

Well it shouldnt be that rich that you have to use more than half throttle to go faster than 5-10mph. It shouldnt be choking on the fuel, yet it should be spitting a small amount out

Bliping the throttle is fine, but dont run it at that for an extended time until its broken in unless you need to to get it up to 200 degrees.

well its already done with break in, but what i did was okay and wont hurt it? when it came out of the box it was so rich that it couldnt even engage the clutch at 3/4 throttle and was running very cold so i did lean it out before the end of break in, but i just went slow and dindnt hold it on power for any more than 4 seconds so i think it was broken in well. it was rich, about 190-200 degrees, 4 second gentle acceleration. how does that sound to you guys? do you think it will last long?

Did you break it in according to the HPI manual or did you use the heat cycling method? the Heat cycling method will allow your engine to see up to 10 gallons with excellent performance, maybe more.

The break-in according to the manual will not allow that longevity..I should not say that really, my very first K4.6 I broke in according to the manual and it ran until 10 gallons, but its performance dropped to that of an S25 at about 7 or 8 gallons.

well, i idled it for the first 1/2 of a tank, then drove it at 1/4-1/2 speed for 4 seconds on power, then at the end of the third tank i used that same method but with 3/4 throttle, then at the 4th tank i used full throttle but i was still gentle and it was still pretty rich. do you thing it will have a good lifespan with that method?

I drive my cars pretty much all the way through breakin. On OS, SH, and RTR engines, I make sure the temps hover around 200 for the first tank, applying the brakes with some throttle applied too, for a bit of a load. after that, I drive em

so do you think my engine will have full power with a good long lifespan?

absolutely

ok cool. thanks!