FYI my motor details are as follows:

Model 091202
Type 1371 E1
Code 990713YA

I had a look at the outdoorking shop but couldn't find a specific shaft listing for 091202-1371-E1. Just dunno how easily available they are or if I can just use any crankshaft from a second hand 3.5hp engine, does the 'type' matter? Either way OEM new looks pricey - if I have to replace the shaft with one of those I think I'll just bank on a new motor?