RE: Thinking about putting a new motor on my savage .25
Mach 427. Cheap, powerful, user-AND-DRIVETRAIN-friendly... Ideal Savage engine.
Also, look for a Sportwerks 26. They are identical to the Mach, more or less(better carb..), but have a pullstart. With the Mach you might need a Losi Spinstart... (which is better than HPI rotostart anyway..) If you get a Mach and want to use a HPI Rotostart, get the backplate for the XTM 24.7.
Sounds like a hassle. But it's worth it..