What engine t Rex 600 nitro?

[Spanner]

Or if you can find an Align 50, exactly the same engine as the OS, but spares are a fraction of the cost.

[debrooker]

i find you need to know what your doing alot more with 3 needle carbs over 2, thus if your newish to nitro then OS50. I've had an RL53 and that was temperamental also.

[waveydavey]

Never had any issues tuning any of the above. The hyper 50 tunes okay as does the 55 and the TT53. All depends what you want and how good you are at tuning, the 50 will run until you pox the ring. Then it's game over, if you can't tune you will wreck the 50 and everything else you run. Three needle carbs are no different to 2 needle carbs, in fact easier. Shut the mid down,closed, tune low and high and only then tune the mid.

There are loads of tuning guides for all the engines you mention,follow them and you will be okay