I've had my STS .28 in my Savage a couple of weeks now and I'm very pleased with it, it has certainly got more power than my HPI K46 engine.

A couple of things worth mentioning, I ran the first few tanks of fuel through it with it mounted on my bench, started by the roto start I brought for it at the same time, the small gear inside broke up even though I had the glow plug loose every time I started it, but the good thing was the small gear is the same as the HPI roto start I used on my K46 so I simply put this in the STS roto start back plate and it worked great.

One of the head bolts came loose during the first tank of fuel but luckily I noticed this before the engine had got hot but worth checking before you run yours for the first time.

The roto start will not work in a Savage truck, the HPI version has the shaft input in the top left corner of the back plate for a reason, to miss the rear diff cross member. I am using the pull start that came with the STS engine and it is working fine, seems to be stronger than my org HPI version was.

All in all very pleased with the way this engine performs.