I have to crank the engine several times with the choke full on. Then I put the choke to full off and crank it again. The engine starts like this, but then I have to very slowly advance the throttle up to running speed. If I advance the throttle too fast, the engine cuts off. The mower runs great when I get it up to speed.
Fuel flow or blocked main jet
have the carby overhauled and check for full fuel flow
SOURCE: How to install a drive belt on a john deere 175
Photos and description available at
http://outdoorpowerinfo.com/repairs/deere_175_drive_belt.asp
SOURCE: John Deere Mower Engine Issue
HAVE YOU CHECKED THE CARB AT ALL? LOOK AT THE LINKAGE & MAKE SURE IT MOVES FREELY! IF CARB CHECKS OUT MAKE SURE GOVENER IS ADJUSTED RIGHT!!
SOURCE: John Deere LA145 B&S 22Horsepower engine starting and running
You may simply need a new fuel cap,vacuum in the tank will rob your fuel and stall it engine,try taking off the fuel cap and see how it runs.If this does not help you may need a new fuel pump,which runs off of crank case pressure and should take over from the choke once the tractor has started.
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