15Tooth clutch bell should get you the low end you want.
This is from chubbysuncle from another thread Hope it helps. Looks like it will have to be a single speed only.
Are you talking Tornado XL? If so I don't know if there's a 2 speed clutchbell available that will fit. I believe that for the single speeds an HPI clutchbell will work. I will do a test fit on the Volcano next time the engine is out but the 18 t spare that came with my Savage looks like a perfect fit. FYI the #'s are HPI A990 for 15t and A993 18t. Those are standard bells. The HD racing bells are 13t #77103, 14t #77104, 15t #77105, 16t #77106, 17t #77107, 18t #77108, 19t #77109 and 20t #77110. These are start outta the Savage parts list. Single speed only!
OK clutch spring broke on the Volcano 2nite....SO....18 tooth HPI clutchbell just fits. I believe that this has been posted before but I can verify! . Bell does rub upper support a little but it works. The truck flies! Check the vid thread!