Hello Brendansarah15
I feel engine competency is required here.
The link to the HK25-30 has an operator manual (sent above).
It includes carby adjustments, but a carby clean and inspection is needed.
Do you have competency to do this?
I suspect a flogged out clutch requires some images for Mod BB to access.
We need to look at the crankshaft and clutch body condition.
The SB's did have a cotter pin; later clutch bodies had square head screws.
https://www.outdoorking-forum.com.au/lawn-mo...ott-bonnar-clamp-pin-a453894?cPath=&Please advise us.-------------------------
Jack
