OK, break in..........The book says to use only 20% in the S-25 engine, after break in you can up to 25 or 30% it's up to you, but I just run 20% in mine and I use Trinity Monster Fuel (20%), the 1st tank you are pretty much going to just let it idle through the 1st tank, then you are gonna let it cool, after you run it out of fuel be sure the piston is in the BDC (Bottom Dead Center) position, or the piston is at the bottom of it's stroke while cooling, on the 2nd tank you are going to start to drive it a little, what you want to do is try to keep it in an oval and you want to only give it up to 1/2 throttle only for about 10 feet then let it coast for 10 feet, do this for the entire 2nd tank, then let it cool just as you did on the 1st tank. Now for tank 3, on this one you are going to increase your oval so you can get it up to but not over 3/4 throttle for 15 feet then coast for 15 feet, do this for the entire 3rd tank (I would alternate between 1/2 and 3/4 on this one, say go 1/2 throttle for 10 feet, coast 10, then 3/4 throttle for 15 feet and coast for 15) after you run this tank dry time to cool down again same as before, piston in the BDC position, ready for tank 4? On tank 4 you are going to run it in the oval and go up to but not over 3/4 throttle, this time throttle for 20 feet and coast 20 feet, and keep going up to 3/4 throttle, run this tank dry and.....yup, cool down again, same as before, I would run a 5th tank the same as tank 4, what you are doing is "Heat Cycleing" the engine and making the best possible fit for your piston and sleave, the reason for BDC at cool down is you don't want the piston to block the sleave from shrinkage durning cool down thus giving you best "pinch" or best compression for when you adjust the needles for more power.......now after you run the 5th tank dry and let it cool, it is FINALLY time to start adjusting things and making more power, fill the tank with fuel, start it and run it for about 2 minutes, after it has warmed up you can start leaning out the HSN, turn the screw clockwise about 1/8 to 1/4 turn at a time and run the truck for about 1 - 2 minutes so the needle can reseat for the adjustment, you'll know when you are getting close to the "sweet spot" while adjusting, just wait till it hits 2nd gear for the first time.......:ahh: Do you have a temp gun? If not I would recommend getting one, the run anywhere from $29.00 up to $50.00 for the small hand held ones, the Venom onboard cost $50.00, ofcoarse your LHS may have it cheaper......but a temp gun is going to be one of the most IMPORTANT investments you will make after getting your new Savage, temps should go no higher than 270!
