I just discovered this site and I love it. You all seem to really know your stuff so I'm hoping you can help me out with my issue! I am a homeowner with 1/2 acre flat corner property with a couple trees/beds. 4 years ago I bought a used Gravely 36 for $1000 from a local dealer and have loved it. I've been through 1 belt but that's the only repair outside of basic maintenance. I went to start it up last month and it wouldn't start. I always change the oil, blades, air/oil/fulel filters, empty gas etc as required so I was confused. I did what I could to fix it but ended up hauling it to my local dealer (honest place). They haven't given me an estimate yet but they did say it sounded like a blown valve. I do have the money budgeted to spend about $3K on a replacement mower but I wasn't planning on getting one for another year or two. My question is... no matter what the problem is, how much is too much to spend to fix my Gravely that I paid $1000 four years ago? i.e. when is it a replace vs. repair? $200 in repairs? $500? It doesn't have an hours counter so I don't know how old it truly is. Please help? Thanks in advance!