lrp is sputtering

[Rebel Savage X]

I just got done with the sixth tank of fuel in the new lrp and started leaning it out. When it gets warmed up it will sputters between first and second and then die. I took it out to a big open area i thought it would help to bring it up slow but it still did it and now when it is warmed up and stalls it sucks fuel out of the carb back to the tank. When it is running I got it up to 237 on the temp that is the highest I have gotten it I thought that would be a good stopping point. So it any one can help please thank you.

 

[scrogathon]

richen it up, run some more tanks through it, the lrp breakin doesnt seem to be enough to open it up att all.

 

[Bankrupter]

+1 to the richen it up. If it sounds like the mill is turning off an on at WOT its too lean.

 

[X]

I made the mistake of over leaning my LRP once and it did the exact same thing. Give it a little more time with the break in process and then try tuning for performance again.