1961551 2 #1 Posted September 8, 2009 hi, im new here. my current project is a 551. i believe it has the original tecumseh engine 3/4 shaft with internal oil pump. it has electric start. the bad part is it was missing the blower housing when i got it. and the threaded end of the crank is broke. so i have another running engine. but, it is a 1 inch shaft. it also has an oil pump with provisions for starter. its currently on a 633, but is not correct. is this enough info for someone to help me decide if i can use this? Share this post Link to post Share on other sites