This may be a stupid question but is the shaft on the OS-21RG-X(P) a standard size to match my existing Tmaxx clutch bell? Will I need any additional items to install the Clutch and Bell on the shaft besides what I have on my Tmaxx motor. There is no data on the OS site that states the diameter of the shaft. Also no tuned pipe recommendations for these type motors. Thanks for any info you can provide...

Xtreme,

You'll have to contact Traxxas about which of their parts will fit the engine.

The threaded part of the pilot shaft crankshaft is 1/4x28, the standard size for most small to medium sized engines.