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My 4.6 has tons of power after tuning it. Buy a temp guage.

Get a temp gun first, then tune it. You need to be around 250°

On my savage I went from a 17T Bell to 15T bell and from 47T Spur to a 52T Spur and it now has a slower top end, I had to adjust my 2nd gear shift point. Reading the manual with a 15T Bell and 52T Spur it is easier on the engine, less strain. The 17T Bell and 47T Spur definitely worked the...

Buy bell clutch bearings, inexpensive but well worth it when they go. Blue Loctite Possibly Spur gear since it is plastic Some extra glow plugs, just be sure of the temperature plug compared to which % fuel you use from what I have read.

Just trying to think outside of the box, sometimes it's not the obvious. Just thought something might be loose.

Is the frame twisting causing the linkage to pull more one way than the other? Or something hitting the linkage?

If it is rust and you get it to break free or clean it I am sure the surfaces will have corrosion on them. I can't see the engine lasting too long, something is going to wear out faster.

As for the Spur Gear I just bought the Savage X4.6 and it does wobble. I watched the video about adjusting the gear mesh in the thread about what to do before running a RTR car and even in the video is shows the Spur gear with a wobble so I figured this must be common. I am surprised the...

HPI is sending a new set, I called the shop and they said $2.40 each so I think I will pick up a set from the store instead of waiting and when the extra set comes I will have it on hand just incase. Thanks

I had a set already gernade, it seemed premature but I am positive the backlash was set improperly from the factory which in turn being new to the hobby I did not know it should have been checked before the first run. It went about 5 tanks of fuel before they were adjusted (it was too tight) and...