No need to buy the relined cone clutches. Reline them yourself or have a local brake/clutch shop do it.
I just finished a total restoration of a terra tiger this past spring. lots of body work, every bearing and bushing was replaced, re-lined clutches, new comet primary, new robin Subaru 14 hp (I got it dirt cheap). I will say unless your dead set on a Terra Tiger find another machine. By the time I was done just in parts I had way way way more than I ever wanted to spend not to mention a lot of lot of work. Im and Allis Chalmers guy so that's why it was worth it to me and I love projects. But as stated it dose have drawbacks, no reverse-it can be heavy to push, and without a frame there is a lot of flexing of the body, despite my best efforts of re fiber glassing and using evercoat fiber tech filler I am starting to see some cracks in the gel coat once again. But in the end it was worth it. A few tips I have found; if your machine is an earlier model and dose not have keyed sprockets ditch the groove pins and use grade 8 Allen head bolts and lock washers to secure the axles. Check all your axle flanges for cracks if your going to use adaptors such as those from adair argo, I have broken three wheels off my TT and had to re weld them on and add braces behind them. Also if you decide to use a newer style 4 stroke such as a Honda,Subaru,Harbor Freight etc, don't plan on having anyone but a kid ride shotgun, there is no leg room left since the head sticks out at an angle. And AWLWAYS ALWAYS ALWAYS make sure your chains are tight. I have a couple different parts books and made notes of all the new bearing and bushing part numbers along with other various parts so you can get the from your local bearing house. If your interested in a copy or any other info please inbox me Id love to talk Terra Tigers.
That's really good advice Andrew. The TT can be a fun machine if you remember it's limitations. Just keep it in the fields and on easier trails .....Think of it as owning an old ford model "T". It is a piece of history.
If you really want to hit the hard trails and mud holes, find an inexpensive MaxII or Attex.....you will be much happier.
Remember this is not even a true Allis-Chalmers design,possibly if it had been then things would of been more thought out and heavier duty.