Great job Jamerson!! It happens with servos. When they wanna go,..they will go.
As for the tuning, I'd start with the factory defaults. Which Savage do you have? Do a search on Google or even the HPI website, or check this Forum for the post that has the manuals. They will have the factory settings which you can use. Start from there. When tuning, it's vital to take your time and don't rush it wanting speed quickly.
Adjust in 1/8 small increments on the needles...drive around abit and tune again. Tuning won't have a difference just sitting there.
Also read up on the slipper clutch setting in the manual. You may as well remove the Spur gear and have a look at the slipper pad to see if it's still good or needs replacing.
Personally, when I get a used truck/buggy, I strip everything apart, clean, regrease and re assemble. This way I can check everything from plastic parts to screws for damage, warp, strips, etc and replace if needed. I then set the engine back to defaults and tune as if I just finished a break in period, running the engine slowly without anything over the top. God knows where and what the engine has been through in the past!! I also seal the engine with High Temp RTV especially good if it's a used engine. In the end the truck feels like new and it's as if I built it up knowing what works and what may cause issues. A new glow plug as well and even replace all the hoses. It takes awhile to do this but it reduces the troubleshooting process when something doesn't work well. Diagnostics are easier.
Keep the post coming in and let us know what youve tried. As long as your running rich and temps are reasonable you can't do any harm to the engine. A temp meter is a good thing to have...tho you should tune to performance and sound more than temps. Running on bumpy ground makes it harder to hear or ascertain a good tune. Find a flat surface....a car park works well.
