snowhound 103 #1 Posted December 3, 2023 I have a GT1800 with a B&S 422437 60663-01 motor and I can't find a parts diagram for it. I had to remove the flywheel and lost the key and have been told by some to use a steel key and others an aluminum key. I wanted to get the part number and order one so I know i have the correct one. Share this post Link to post Share on other sites
gwest_ca-(File Mod) 10,503 #2 Posted December 3, 2023 Your number has an extra digit. This one maybe? https://www.partstree.com/models/422437-0663-01-briggs-stratton-horizontal-engine 1 Share this post Link to post Share on other sites
RED-Z06 2,122 #3 Posted December 3, 2023 Aluminum key, the key only holds the time until the nut is torqued, then the taper holds it. If the engine stops suddenly, you want the flywheel to shear the key and expend its stored energy slipping on the taper...a steel key won't shear, and will force that energy to go elsewhere 3 Share this post Link to post Share on other sites
Handy Don 10,622 #4 Posted December 3, 2023 2 hours ago, RED-Z06 said: force that energy to go elsewhere Elsewhere being a not good place! Share this post Link to post Share on other sites
RED-Z06 2,122 #5 Posted December 3, 2023 8 minutes ago, Handy Don said: Elsewhere being a not good place! Split flywheel, snapped crank journal, busted crank...its gotta go somewhere. Aluminum key is an inertia fuse. 2 Share this post Link to post Share on other sites
