Well dang it, I thought I was on to something.

thats normal, the engine has a compression release to help it start.

Thanks for the info. I read up on the compression release (new to me) and managed to track down my feeler gauges. The intake valve is set to .009" clearance and the exhaust is set to .019", both within spec.
As soon as I can get to it, I'll pull the engine shrouds and check the head bolt torque.

Just go ahead and pull the head.

Have you tried starting it with some starting fluid? Just a thought before you pull the head..might reveal a fuel issue... and double check the spark is good.

I'm still betting it's NOT the valves...Beginning to feel better about my bet now...

I'm not convinced.

If not a valve problem, how is the gas spray getting back into the intake? :bigthink:Personally, I would be a bit hesitant to personally bad mouth the seller 'till I knew exactly what the problem actually is. Sh_t sometimes happens.

Have you done comp test?

Engine has a compression release. Not simple to do a compression test. Easier to pull the head and look.

Just for S and giggles i just tested the compression on one of my 1650's.
30# after 3 hits on the gauge, wide open throttle. The tractor has been sitting for about a weak and it's about 60* in the shop.
This tractor will lite right off any time.
For what it's worth