Is there something in particular your needing to find? The original yerfdog service manual pertained mostly to the motor it's self with very little info on the chassis. It listed part numbers for chassis components but these numbers are obsolete. The motor is a standard 157QMJ so any service manual pertaining to the gy6 150 cc will cover it. A forum supporting vender, Buggy Depot carries some chassis upgrades along with all motor parts. BMI karts bought out the remaining yerfdog inventory when the company folded so they have some OEM chassis parts but when their inventory is depleted, it's history.
There are a lot of yerfdog owners on this forum with tons of experience so if you have any questions these folks will help.
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