Drive Pulley ?'s

[dpm2000bolt 0]

I have a 79 C141 8 speed and I am doing a diesel Transplant the thing is it had a 4" pulley on the motor and I have a 5 1/4" on my Hydro I got a new belt and it is way to long what is the Pulley size on the Axle as it is 4" now I am just trying to back to OEM to place the motor in the correct spot using the belt

the second question is what is the size pulley on the C81 as I need to find a Drive pulley that is 5 1/4" with a 1" bore

[Kelly 1,030]

The 5 1/4" pulley is for the hydro not a 8 speed, if you want to go back stock you need a drive pulley off a 8hp 8 speed like a B-80, C-81, C-85, and a few others like the work horse tractors with briggs engines all use a 1" crank, I think the stock 8 speed pulley is 4", and just so you know, the hydro pulley for a 1" crank is hard to find, I just last week got one but paid a fair price for it, I have a diesel transplant coming up so also, in a hydro.