450 LP Carb/ Throttlebody

I'm having problems with my 450 LP Ensign regulator and want to change to Impco. I already have the regulator and 110 carburetor but need to get the throttle body that is compatible with the governor. Does anyone know the number of that throttle body? Thanks, Dan

I have had a W-400LP for about 10 years. The liquid line was capped when I bought it. I ran the tractor on vapor but never used it hard. It ran OK.

Last fall, after sitting for about four years, it would not run on vapor. I took the regulator apart and found mucho corrosion. I bought a few parts but, while doing that, I spoted a regulator on eBay. I bought it for $30. I installed it immediately and the tractor runs great on both liquid and vapor. The parts cost me about $110. If you search on my name, you will find several threads on my experiences. There will also be several contacts you can call for parts and service.

But let's assume that you want to change to an Impco regulator and go the trouble of fabricating new hoses, pipes, and mount. The Ensign carbureter should work OK. The only potentially defective part is a small diaprham. My carb was fine.

I suggest that you create a search on eBay. Something will pop up within a month or two. eBay will email you when it does.

From talking to several people with LP experience, I think the rust in my original regulator was an abnormality and not a common failure condition. If the seller says the tegulator worked well before removal from tractor, I think you can buy it with confidence.

There is a 450 LP carb and regulator on eBay now. It closes today. Click below.

BTW, the diaphram in the carb functions to stop fuel flow when there is no vacuum in the intake manifold.
eBay listing

Stupid question alert.
So what goes into an lp carb? Does the regulator control the flow of liquid/vapor and the carb is only used for the needle valves and their control of flow? Is the float system used at all or does the regulator meet this need?

There is a butterfly controled by the governor, choke, venturi, four gas jets 90 degrees apart, and the safety shut-off diaphram that is overidden by an open throttle.

There is no float in the system. The regulator also serves as an evaporator. There is a high pressure valve and a low pressure valve with each one having a diaphram. Tractor coolant flows in and out. Fuel comes in through a separate filter as vapor or liquid depending on which tank valve is open. Fuel goes out as vapor. There is a vacuum line from the intake manifold. There is also one screw that requires adjustment.

Thanks, Wardner. I think I'll take the carb and regulator apart and see what's going on in there. It may just need cleaning. Dan