Originally Posted by
Nitrovein
I believe you're right aspeed, at least that's what I've heard as well. I think it was a couple of years after I bought mine that Magnum appeared and they looked like the TT that was sold then.
The carb is a nightmare, one click on the HSN in either direction and it's either lean or rich! 
My TT .25 carb behaved similarly - the transition from idle to WOT was sloggy and slow even with the idle set as perfect as I could get (I could get a 2000rpm idle with a 9x5 on 5% nitro) but it was just a slug both in manners and power. Mine was twin ballraced and had a Meehanite piston/steel liner. Piston seal was very very good...
It was advised not to run it real fast and not with a lot of nitro if you wanted it to last at all.