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low power in 1947 Cub

B

brooksie

Member
I have noticed a slowly progressive reduction in power in my Cub over the last few months.

I used to mow in second gear with its Bush Hog belly mower but yesterday it mowed best in first gear with just a little bit of choke on. It really could not do the job in second gear. It would sputter and die, and then start right up.

It did not want to run in third gear much at all with the PTO off. It used to do this fine.

It idles well and is not producing any smoke.

I am guessing the carb is the problem but carbs are a mystery to me. It has an inline fuel filter off a VW beetle and I know many folks here think the inline filters stink but it was running fine with it before.

Help.
 
Yes, ypu need to check th carb. Pulling the choke enriches the fuel/air mixture so something is not right. Other things that can rob power are dull blades. Check to see that the front of your deck is slightly lower than the rear of the deck so you are not cutting grass twice.

Phlogiston
 
Check out the carburetor. Clean it and put in a new kit, (YT sells carb kits). Make sure you order the right kit for your carburetor. Does it run different at different temperatures??
 
Running fine before thats one of the problem with the in line filters they clog up fast and with no fuel pump pressure to push the fuel through the filter you slowly slow down the fuel flow to the point you have little or no power which sounds like your problem. Remove the filter and see what happens I'd almost bet you will find power improves. If it doesn't then the carb is clogged up and the filter didn't do you any good any how
Hobby farm
 
i agree with old on the in line filter. it wont flow enough being a gravity system. the old beetles had a fuel pump. if you absolutley gotta run an inline filter, go to napa, get either a 3031 or a 3032 in line filter, one is for 5/16 lines, the other for 3/8 fuel lines. they are full flow filters, and will work in a gravity flow system.
 
You should take off that inline fuel filter, even if it was fine before. It is designed for a fuel pump to pump the fuel through it. The tractor already has a fuel screen in the sediment bowl and a screen in the carburetor, so you don't need the inline filter.
 
Pull the fuel line going into your carb, see if you have good flow, if not your problem may be a clog some where between the tank and carb. Might be a clog inside the fuel tank. If you have good flow at the carb then take off your carb and clean it.
 
Before you do any of the above, remove the 'hex' shaped jet on the side of the carb with the fuel on. This will tell you if you have good fuel flow into the carb (weither or not the two inline screens or filter is clogged, or if the needle valve and/or float is sticking). Have a bowl ready to catch the fuel spilling out the side of the carb. Clean the jet you pulled out with a small copper wire and compressed air and reinstall after fixing any issues you may find concerning fuel flow. I'm with the others, remove the inline filter, it is no good and only causes problems. Purchase any parts you may need through Case-IH.
 
Howdy
File this under interesting facts, not sure what year it went into effect but Federal Gov mandated that Oem gas filters be equiped with roll over valves so that fuel could not continue to flow in roll over accidents, took a fuel pump to overcome spring pressure on roll over valve. (looked a lot like a needle & seat) Carburated vehicles of course, which I assume a VW Beetle was.
Bob S.
 
Ok, the filter is history, and I sure appreciate all your comments. i will get to work on it this weekend.

Thanks again.
 
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