I am going thru one of these, learning as I go. The tractor came to me with a rigged up LP carb and regulator. I got ahold of a factory setup, acquired economizer, low pressure and high pressure diaphragms and reinstalled all with a new vapor hose. At first, it started and ran well with factory settings, just had to go out a bit on the main screw. Now, the last couple days, it won't run without partial choke, on either vapor or liquid. Open the choke and it's like I turned off the key. I'll pull the regulator back apart and double check the lever adjustments and seats and diaphragms. Maybe the diaphragm sealant I used doesn't work.
Are there any other troubleshooting suggestions.
Thanks, Chris B.