Another cub that won't start

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Another cub that won't start

Postby byrongraham » Fri Dec 16, 2011 9:13 am

Okay here it is. I bought a '48 cub that was refurbished and ran really well for about 3 hours collectively. When I try to start it it turns over and wants to start but doesn't . The carburator floods immediately. If I try enough times it eventually starts and runs well. But when I turn it off the same thing happens. Won't start. I bought a new carb , rebuilt it all that. The same problem occured. When I turn it off a strange whirring sound occurs that never happened when it was running normally. I'm far from an expert but everyone says carb ... but I not so sure. Also maybe some could explain how to use the idle screw and the other screw on the throttle lever. Very confused.... Thanks everyone... Byron in CT.
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Re: Another cub that won't start

Postby Bigdog » Fri Dec 16, 2011 9:41 am

First of all - welcome to the forum! I suggest you do a full ignition tune-up or at least confirm that you have a good hot spark and that your timing is on.
Are you using the choke to start? Most cubs don't tolerate a lot of choke. Generally a couple of revolutions with the choke on and then half-choke or none at all and they will start.
It also would be good to do a compression test and valve adjustment to make sure things are where they're supposed to be.
Check those basic items and most likely you will find your problem.
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Re: Another cub that won't start

Postby Like-em-all » Fri Dec 16, 2011 9:59 am

byrongraham wrote:When I turn it off a strange whirring sound occurs that never happened when it was running normally.

Could that be the sound of a vacume leak that has developed?
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Re: Another cub that won't start

Postby Bigdog » Fri Dec 16, 2011 10:21 am

Most of my cubs have a "wheezing" sound when shut off. Just a little noise when the engine rolls back from an incomplete compression cycle. The better the compression, the more noticeable it is.
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Re: Another cub that won't start

Postby Eugene » Fri Dec 16, 2011 10:34 am

Whirring sound. How long does it last and where is the noise coming from?

48 Cub. Cooling system. Quite possible that the cooling system needs to have the sludge accumulated in the lower radiator housing and around the cylinders removed.

Electrical appliance?
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Re: Another cub that won't start

Postby byrongraham » Fri Dec 16, 2011 11:46 am

the sound comes from the front and last just a few seconds... thanks
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Re: Another cub that won't start

Postby Stanton » Fri Dec 16, 2011 11:51 am

Welcome to the forum!

I know it's easy to get frustrated when things don't work, but hang in there. There's plenty of help here.

Take it slow and do what is suggested here by these forum members; eliminating each area as you go.

Just for additional reference, here are two posts of mine that sounds very similar to your situation. You might read them both and see if they help.

#1 -- viewtopic.php?f=1&t=64776

#2 -- viewtopic.php?f=1&t=66624

Even though gas was coming out of my carb, like yours, I believe mine was an issue of carb and mag/distributor. I rebuilt the carb, verified the float height and the gas level in the carb, replaced the spark plug wires and ensured a spark at each plug, and checked the mag timing. I've got a distributor tune-up kit coming from TM because I had burn marks inside the distributor rotor cap.

Here's the link the Lurker Carl's Cub Carb fixes: http://www.cleancomputes.com/Cub/Mainte ... index.html (great information!!)

Wish you success and keep trying!
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Re: Another cub that won't start

Postby Rudi » Fri Dec 16, 2011 1:32 pm

G'day to you and my there sure seems to be a lot of no-start issues lately...

You have gotten a lot of good information (and some of us have learned something new as well) .. and I would suggest you follow the links below as there is a rather large amount of information/resources available to our members.

Image to Farmallcub.com :big smile: Forum Family. And you have come to the right place for all things Cub related. If you click on the Site Rules, Regulations, & Important Information, it will point you to :arrow: the Welcome Wagon wherein you will find links to many useful sites and topics. One of which is the Cub Manual Server. Enjoy!.


My 48 Cub Ellie has always made a little wheezing sound as she shuts down, never paid a lot of attention to it till now when I think I just got a clue as to what it was and it is kinda reassuring as well:

Bigdog wrote:Most of my cubs have a "wheezing" sound when shut off. Just a little noise when the engine rolls back from an incomplete compression cycle. The better the compression, the more noticeable it is.


I used to think it was partially connected to the last bit of fuel being consumed and then the last gasp of air. Now it makes sense that it is compression -- probably same thing -- BD just explained it better :D :!:
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Re: Another cub that won't start

Postby Matt Kirsch » Fri Dec 16, 2011 4:14 pm

Check if the "whirring" sound is coming from the radiator by removing the radiator cap while the noise is present. You said it was coming from the front. I suspect that pressure built up inside the radiator due to the water getting warm is escaping around the cap and making the noise. It's the same idea as when you hold a blade of grass between your thumbs and blow through it to make a very loud whistle.

If it's coming from the radiator, it's normal.

The gas pouring is too much choke and/or a sticking float. If you're NOT pulling the choke, it's a sticking float.

Carbs can be a little tricky if you're new to it. You never get it right on the first try. New ones get banged around during shipping and usually need to be adjusted right out of the box too...
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question about 6v batteries

Postby byrongraham » Wed Feb 13, 2013 10:15 am

Question about 6v batteries.... is it uncommon for 6v batteries to weaken overnight when it is very cold. And if I leave it hooked up to the charger overnight will the charger not continue to charge and harm the battery once the charge completes. Thanks. Byron in CT.
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Re: Another cub that won't start

Postby Boss Hog » Wed Feb 13, 2013 10:22 am

You can use a battery tender, they say they work well. It is hard to say on your 6 Volt battery too many variables, how old is the battery, how many cranking amps, and was it fully charged to start with.
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