running on one rotor
 

I have available to me a '93 tt RX-7 RHD but it only runing on one rotor. so my question is what is the average cost for a used motor or what it would cost to rebuild? Also what how much to modify if I had it rebuilt? Not looking to make a track car but I do have a heavy foot

Look for a rotary specialty shop close to you. Depending on what's wrong, it's usually less expensive to rebuild than to replace.
RHD cars originated in places where I suspect "routine maintenance" had a much different meaning. It's also my sense that their value is falling quicker than LHD models....so check the rest of the car carefully.

EDIT: it's usually easier to replace than to rebuild...You can get a reman with 1 year warranty not much more than the cost to rebuild and sometimes less. And it's been proven that high HP can reliablely be extracted from a completely stock engine, so no internal upgrades necessary.

Maybe I should have qualified my answer as my opinion. But I've seen some comments that suggest the the quality of remans isn't what it used to be. And it's always been crap-shoot as to how many new parts you'll get. Maybe new housings...maybe not. Maybe new bearings, maybe not. Some other stories like oil pick-up tubes plugged with sealant, mis-matched rotors etc etc.
For me and what I wanted a couple of years ago it was easier and less expensive to rebuild for a coolant seal. He also mentioned modifications and port work could be done at the same time.
Had I had a hard seal failure a reman might have been the way to go though.

Well put, I'd agree with this post :icon_tup:.

Personally I found a rebuilt used motor with lower miles on it and bought that, ended up being cheaper than a base rebuild and has turned out great. BUT again it's kind of a crap shoot and you really want to make sure you're buying from a reputable seller so you don't end up with a bad motor.

I sell "prebuilt" engines and build them to your preference and there is no core fee or core required. Price shipped to Canada would be around $3400.00 shipped and would be using new ALS seals, new bearings, pretty much replacing everything in the enigne with the exception of the actual Metal Oil Control ring scrapers.

www.rotaryrebuildstore.com

^If I was needing an engine today, this would be my second option after doing it myself. Certainly before buying a reman.