ORIGINAL: HerrSavage
My orange stock LST2 Mach engine was very good - especially on top-end. The teal/silver engine has a bit more power - it was the stock engine in the Muggy/8B/8T(if you ever find one for dirt cheap for some reason, buy it... Great all-round low-hassle engine.. - very close to LRP Spec 3 power, missing a bit of the grunt, but drinking a lot less fuel...)
In a heavy LST2, I found the orange Mach had a great top-end(with a cold OS A5), but not really the grunt down low for wheelies-on-demand.., with the LST2's wheels which weigh approximately 12,000 pounds each..
I have a Big Red 28 in my basher right now.. It's OK and for the price I'm happy with it, but the LRP Spec 3 is better - and IMHO the perfect engine for an LST2... - though it will drink twice the fuel of the orange Mach...
You seem to know how to tune well and set your stuff up, so just get it, run it, and enjoy it..(and post videos, of course....)
Don't forget a tiny dab of threadlock on the wheelnuts... Also, btw, you can find stickers to cover the white rims if you really don't like them..
I would get a gear cover too - same part for all the Losi MT's... Though maybe get the truck first, run it on pavement to see how it goes.. That way, if there's something wrong, you can order whatever else you might need once you've inspected and tested the truck..