I have noticed a few guy always have questerns reguarding break in all the time and they read the bible and still have issues

id just like to point out what i have learned for my self,our weather in australia is diffrent here manily realy warm and dry in summer.

if you dont heat the engine up prior to run in you can damage the rod it will stretch the big end

secondly i think too much theiory around how much juice to run through engines is stuffing peolole up

I run half a tank starter on box just anough to bring it up to temp then shut down arfter all shut downs i put piston btc

i then do this for another tank,then i fill tank up put on ground by this time i make sure my needles are close but 12 hrs out on lsn and then about 2 turns out on hsn then run it around i usualy do 5 tanks but each tank i lean 2 hrns on hsn

i then wack my car on the track basicly run like normal slowley leaning of hsn 2 hrs every tank till i get about 1tr on the engine(but dont over rev it) you will slowley will see the engine making more power as it gets loseer

I then give it full tune but what i do is when i get it right i back of the tune so its still a bit rich till i get some more fuel a race like this for a club day, then the next meet i run it a bit learner every time till im happy this actully takes the longest as
you wont it perfect and free before you realy lean it of,by rich i dont mean tune it up so its slow i mean i little rich but not on its proper race tune

thats how i run in my motors never had a issue yet one btta has 12 litres so far the other has 7 and my os has 27 on it these are my current engines ive been using since i was showin it ten years ago

oh use a new plug when you start to lean it of lol