I see alot of engines being replaced on here and I've only been on for roughly a week or so. I had the one engine in my Speedster done a few times and all three times it burned down the MAG piston. So on the fourth time I did the rebuild. I lost trust in everyone. The only reason I paid to have it done in the first place was money was easy to come by at that time and I was working a lot of hours. I'm a service engineer by trade---I fix machinery for a living and am mechanically inclined, so I wasn't afraid to rebuild the engine at all. Now with kids, money isn't as easy to come by and my influx for toys has gotten worse. I could be on "My Strange Addiction". If gas is required to run it--I'm into it.
Here's my twist on the whole remanufactred engine VS. build your own. This is based off you have all the proper tools, manuals etc.....
I'll preface this by saying that by know means am I bashing SBT, Fullbore or SES. I know SBT, Full bore, and SES are an alternative but honestly if you shop wisely you can put together an engine with OEM parts for close to the same price or cheaper. The most expensive part to the engine is the crank. I'll only use OEM when it comes to that-PERIOD. I just bought one for my build for only $75 bucks more than an SBT crank and I know I'm getting top notch name brand bearings and seals from Bombardier. I see sooooooooo many places that will not accept an SBT crank as a core---because it's welded after it's trued. And if your crank is good you can subtract that from the cost of the rebuild. So just doing a top end is dirt cheap. You need to determine what caused the failure in the first place.
You can do a 787 Carb'd engine all OEM rebuild (reman OEM crank, new OEM pistons(standard bore OR first over size), OEM wrist pins, OEM wrist pin bearings, OEM Circlips, OEM RAVE boots(green), OEM full engine gasket set, for just under $790.66. A standard SBT 787 is $845. Remember that is all OEM parts, no aftermarket. SBT is not using OEM parts. The bore job will probably run you $45 per hole ($90 for both) so you'll be over the price of an SBT engine. But you'll also know that you have a stout engine when your done all with OEM parts.
There are a lot of special tools you'll need that may put you over the edge, PTO removal tool, Torque wrench, seal drivers, and a block off plate pressure testing. Now, if you like to gamble you can skip the pressure test, I for one will not as that is where I found why the last three rebuilds failed--there was an air leak at the base of MAG cylinder, so I assume the last two places who rebuilt the engine NEVER pressure tested it. Also, if you break a screw, your screwed, you'll have to pay to have that taken out, adding more to the cost. There definitely are pluses and minuses to both sides and ultimately you need to make the decision. If you lived near me I'd be happy to help.