I have an Onan B48 motor that I repowered with a Briggs 23 HP in my 420. The Onan didn't blow but it was knocking, assuming valve seat came loose. It has 1400 + hours on it so it was time for replacement or rebuild, I choose replace. This is a complete motor, everything still on it. Can get picture if wanted.

Thank you!

I will not ship so local pick up only.