Here’s a parts manual for it :
https://www.ebay.com/itm/1941-1942-JOHNSON-1-5HP-MS-20-MD-20-OUTBOARD-MOTOR-PART-MANUAL-43-300779-/361211281683
And an expired E-bay listing :
https://www.ebay.com/itm/Vintage-1941-Johnson-1-5-hp-Outboard-Motor-Model-034-MS-20-034-/184142830849?nma=true&si=pZdilo3dfyqPTx3vZMH1yJ%252FBZoo%253D&orig_cvip=true&nordt=true&rt=nc&_trksid=p2047675.l2557
Good luck
