After giving my savage a complete overhaul (list of parts is way to big to mention) i wanted improvements too, 1 of which was i wanted to sort out the jelly tyres, for something that will give much better handling, lighter too so less strain on running gear, didnt need to spend much on these...
id make sure the running gear is all good, gearbox, spurgear and slipper pad,diffs, cups and dogbones, might look clean but that means nothing if the running gear is mashed up
sorry youve lost me, we have gone from engine screaming yet only moving about 10mph which is a sign that something could be slipping, then you say you cant go past half throttle and it cuts out, now you can rev it while holding it to full throttle and back to idle and the temp is 300f
thats why...
what would help is a brief video of your truck running, that would help us a lot, we could hear and get a better understanding of whats going on with your truck
so does the engine dies now
from your first post you made out like the engine would scream and yet the truck don't move very fast, about 10mph
of which if thats the problem
i would take engine out, check the clutch bell bearings and clutch shoes, then i would check the spur gear slipper pad...
if your unsure if clutch on engine or slipper pad on spur gear is worn out and needs replacing then post pics of them both, that way we can advise you further
diagram for spur gear slipper pad http://www.manualslib.com/manual/454156/Hpi-Racing-Savage-X.html?page=22#manual
diagram for 2 speed set up with pics of them 2 grub screws http://www.manualslib.com/manual/454156/Hpi-Racing-Savage-X.html?page=23#manual
diagram for your clutch bell and clutch...
very true, so best to take engine out that way you can get to the spur gear to undo the middle nut, take off and check slipper pad on back, then you can take clutch bell off engine to check bearings and clutch shoes
i don't think its your gearbox, its your slipper clutch / spur gear, most likely needs new pad and / or tightening down
the 2 grub screws you fiddled with, grub screw on top is a screw shaft that needs to be tightened with loctite then it has a small locking grub screw on top of that you don't...
i was very surprised at how well made the charger is, i wasnt expecting much as i bought it for cheap, its easy to use too, most of all it works well
look it up on youtube ... :)