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LA145 Head Scratcher

3815 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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You say it runs good except maybe a sputter here and there. What I hear with that statement is that it runs .... not quite right? How fast can you back off the choke after you start it? If you need to back off the choke really slow, it would support the idea that you are running lean (either not enough gas (carb) or too much air (vacuum leak))

I would certainly spray for vacuum leaks (any change up/down in RPM while spraying indicates a leak).

Did you get the exact same replacement carb as the original. If so, it might be worth taking the jets out of the original, cleaning them really well, and installing them in the new carb.
Is there an electrical connection to the carb for a fuel cutoff solenoid? If so, any chance that solenoid isn't opening until the engine starts (it starts from the fuel you dumped in)? If you have that, I think you should be able to pull the connector off, place a voltmeter on it, and turn the key on (maybe crank the engine) to see if you get voltage.

I don't have anything new enough to have a fuel cutoff solenoid, but when I tried to google your carb, some pics showed one.
Throwing out a random suggestion - pull your carb. compare the carb, the intake, and the gasket. Does everything matchup?
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