Primary drive chain length. HELP PLEASE!

[Vance in AK]

I am quickly running out of time to leave Friday night for hunting. Ready to replace the primary chains (#40dr). Machine is an old (83? No data plates anywhere) 8 wheel With 17hp Kohler & double roller #50 (KB-IC?)
Parts book lists two different lengths on primary
603-22 (46 pins including master)
603-24 (48 pins including master) with remark (RO) = replaces others?

I don't have the old ones out yet & even if they are 46 pins with master should they be replaced with 48 pins with master? Ids this an "improvement" to make on all of them at replacement?

[ARGOJIM]

Count what you have, there was probably 2 different geared jack shafts.
IE. amount of teeth, as an example some 50 jackshafts were 11 teeth and some 13 teeth thus changing the chain length.

[Vance in AK]

Thanks Jim. They were 46 pins.
I had a popping like a Toth hanging up in a chain occassionaly on the right front somewhere that I couldn't track down. It would actually cause the power pack to rock. The primary chain on the right was over tight, the one on left loose. When I went to change them I found the power pach pinch bolt on the right bached out a couple turns while the one on the left was tight. Hopefully that was somehow causing the popping. Leave for noise hunting Friday!