Does anyone know the size nut that holds on the throttle camble butterflies?

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I don't know the size off-hand. If you have a local Auto Zone, take the TB with you, and go to their nut/bolt isle. They carry metric and standard in that size. You might need to open one of their nut holders, but you should be able to get the correct size. Should even be able to find a teflon lined nut that won't back off, or even a pinched nut that's meant to not back off as well.

+1 Ace, Lowes, Home Depot will have large selections of bolts as well.

 

put a wrench on it and most likely:

 

14mm head size will be M10x1.25 threads

12mm head size will be M8x1.25 threads

10mm head size will be M6x1.00 threads

 

it should be the 10mm or 12mm bolt head size.

 

the store bought bolts in the thread size you need will often have different sized heads - but that doesn't matter at all, as long as there's clearance to fit if it's a little longer.

 

i'd get high grade bolts to resist elements.