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LA145 Head Scratcher

3812 Views 31 Replies 12 Participants Last post by  midwesties
I have an LA 145 that is driving me crazy and I'm hoping someone can point me in the right direction.
Here is the problem. I got this tractor which had been sitting a while and I got it basically from an estate sale. The engine has 48 hrs and everything is in great shape. Before I got it the son of the previous owner tried to get it to run but got no where starting it. I cleaned up the carb and was able to get it to run a bit by priming it running gas down the intake however it was obvious the o-rings where dried out. Rather than just buy the o-rings I opted to buy a new carb (just a few dollars more. It now runs good (maybe a sputter here and there) but the only way to start it is to pour gas in the intake. Once I've done that it runs and I can restart it. Once it sits over night I have to prime it again.
So in the interest of saving time: I've checked the gas lines, changed the fuel filter, even tried an electric fuel pump.
There is gas in the float, but it won't start. I admit I don't have much experience with these Briggs 2 cylinders and these carbs are new to me.
Any suggestions, things maybe I missed?
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I would suggest literally looking at the choke plate itself, that it's fully closed, even trying to push directly on the choke plate itself to see if it goes any further.

The choke on my Kohler CV22 won't close all the way in the winter, some ice seems to form just in the right place all the time, and it holds the choke open just a little bit, enough to prevent it from starting, and I have to directly rotate the choke shaft to get it closed all the way (there's a spin-mechanism when using the remote choke lever, and permits this to happen).
Is there a vacuum leak after the carb (carb to manifold, or manifold to head [if present]), or some vacuum tube isn't connected. The idea being, when starting, the engine can't generate enough vacuum for the carb to function properly, but once running, it can overcome the vacuum leak and continue running.
Maybe try, with the engine running, and with the intake to the carb shielded to prevent the spray from going in there, spray something like engine starter spray (just a little, don't want to overdo it) around those two areas. If there's a leak, the engine will speed up.

Alternately, you can use a spray that would make the engine run worse (as this tends to be safer), but offhand I can't think of a good product to use...
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