Originally Posted by mugenb46

Do not do full throtle breakin, and add the shim so it's the one sitting on top of the sleeve, then pull it out after 3/4 gallon or so.

Use foil on the head to help the heat penatrate the entir motor, get to about 240 on the first tank, this will make the first start up of gthe .25 easy, and get to 220 for tanks after that.

idle 5 to 6 tanks on the box and then put it on the ground and start giving throttle in puts from idle to 1/2 throttle and let off, don't keep constant rpm for long. do about 4 tanks like this, keep the foil on the head during this process, the motor may reach a high temp like 250 260, thats ok the needle setting are still fat, the idea is to keep the metal pinch reduced during this point.

After 4 tanks, go another 3 to 4 tanks from idle to full, and again don't hold high rpm for long

During this you will want the LSN set 1 fill turn in from flush, and the HSN Flush, set the LSN so you have a good idle but close to loading up if it sits to long, and lean the top 1 hour, at the end of all the tanks you are ready for race tune.

Set the hsn so you can hit about 235 240, once your there, fatten the top back 2 hours and lean the bottom end needle so you have a good hit from bottom and good transistion to top with good smoke, once you have a good feel from bottom to top and a good race temp of 230 to 250 set the idle so it will sit with out loading up, and you should be able to stab it with a very slight fatness and it take off like crazy. Good luck