another cub with startup issues

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jdeere86
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another cub with startup issues

Postby jdeere86 » Wed Dec 23, 2015 10:05 am

the tractor has always been somewhat hard to start - seems to flood easily

I was reading some posts where folks start by starting her with no choke first and then a little choke ,,,I did get her going that way this morning though she quickly puttered out cause I didn't leave the choke in I believe

here is a short video with audio of what she sounds like...any input would be much appreciated as always...I know this topic is probably already pretty gone over

https://www.youtube.com/watch?v=LQk8rUn ... e=youtu.be

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Don McCombs
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Re: another cub with startup issues

Postby Don McCombs » Wed Dec 23, 2015 11:20 am

Is the fuel valve open?
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jdeere86
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Re: another cub with startup issues

Postby jdeere86 » Wed Dec 23, 2015 11:52 am

yup and when I open drain plug at bottom of carb it is nice steady stream

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Don McCombs
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Re: another cub with startup issues

Postby Don McCombs » Wed Dec 23, 2015 12:37 pm

Sounds like valves and/or ignition, then. When was the last good tune-up and valve adjustment?
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jdeere86
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Re: another cub with startup issues

Postby jdeere86 » Wed Dec 23, 2015 1:02 pm

Not sure - have had her for two years now .... previous owner was mechanic for the state so I know he took good care of her

runs ,sounds smooth when able to get going

somewhat off topic ,,,is it possible to keep betsy working for another 40 years ,,,,in general I mean can these cubs be kept going indefinitely..?

jdeere86
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Re: another cub with startup issues

Postby jdeere86 » Wed Dec 23, 2015 1:03 pm

all I've done is oil changes and just tuned the carb up

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Re: another cub with startup issues

Postby jdeere86 » Wed Dec 23, 2015 3:02 pm

does seem to have a gas leak even when sitting coming from the sediment bowl ,,,not sure if that would be enough to mess up the starting

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Re: another cub with startup issues

Postby snoman7c » Wed Dec 23, 2015 10:44 pm

I had similar issues with my Cub. After several suggestions from members of this forum, I found that this works for my Cub. Try starting for 5- 10 seconds with kill switch OFF. Then pull out kill switch and try to start with NO choke! My Cub fires up almost every single time unless it is bitter cold out, then I will give it about half choke. My Cub is in an unheated garage. Hope this helps you out

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Re: another cub with startup issues

Postby Smokeycub » Thu Dec 24, 2015 9:41 am

I listened to your recording. Sounds like she wants to start. Are you giving it enough throttle? If it's hard to start because of something other than startup procedures then it could be any of a whole host of issues, as others have mentioned, plugs, points, dirt in the carb, valve lash, low compression, weak starter drive spring(bendix), .... . Here's a link to Mr. Becker's start up comparison video. (The 4th one down) viewtopic.php?f=1&t=91018 It should give you some good idea of how to start a Cub and how easily they should start.
jdeere86 wrote:in general I mean can these cubs be kept going indefinitely..?
IMHO they could easily last another 60 years with enough TLC and $$.
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Re: another cub with startup issues

Postby bythepond88 » Thu Dec 24, 2015 12:37 pm

Have you checked the timing?
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Re: another cub with startup issues

Postby Matt Kirsch » Thu Dec 24, 2015 1:35 pm

As I've said in the past, you have to figure out what your tractor likes/wants/needs for best starting.

Sometimes it's a matter of tuning. Sometimes it's a matter of procedure.

The choke isn't a "set it and forget it" control. With old gas tractors, you often have to keep one hand on the choke until the engine warms up a little. Give it some choke when it starts to die, and let off the choke when it picks back up and starts running again.

On my '67, for example, you start cranking with the choke off. It will generally catch and run on the first crank over, but will start to die after about 2 seconds. Give it a quick blip of choke, and it runs a few more seconds. Give it another quick blip of choke, and it stabilizes and runs steady.

If you think Cubs are bad, you should try running one of the bigger 6-cylinder gas engines such as a 560 or a 656. Talk about cold-blooded. When it's cold out, you better be on the choke even after the engine's been running for 10 minutes because it will instantly cough and die on you every time you let out the clutch.

If you're flooding it, that means you're giving it too much choke.

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update and question on timing

Postby jdeere86 » Thu Dec 31, 2015 6:22 pm

finally got some time to work on cub again. fired up this morning after charging the battery. also changed the positive to ground as it is 6v battery ,, must have hooked it up wrong last time. anyways it would not fire up later on. I went to take distributor cap off and noticed two plugs hanging there - could I have done damage by continually trying to get her to start with plugs off? inside of cap nice and clean ....plug ends going into cap some of them damaged lookin

carb seems to be leaking when sittin there so I will check her out again,,float and seat as was mentioned..

anyways now on to the timing ... "Check timing by pulling the #1 (front) plug, and rotating the engine by hand with your thumb over the hole until it blows. Then shine a light in and bring the piston up to its highest point. Now pull the distributor cap and see where the tab on the rotor is pointing. If it's not directly under the post leading to the #1 spark plug wire, then your timing is off."

embarrassing to ask - how exactly do you rotate the engine by hand??

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Re: another cub with startup issues

Postby Bob McCarty » Thu Dec 31, 2015 6:28 pm

If you have a hand crank, you can use that. Otherwise, with the Cub in neutral, you should be able to turn the engine over by turning the fan.

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jdeere86
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Re: another cub with startup issues

Postby jdeere86 » Thu Dec 31, 2015 6:29 pm

quick response! sort of what I was thinking ,,,thanks for confirming

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Re: update and question on timing

Postby Eugene » Thu Dec 31, 2015 6:44 pm

jdeere86 wrote:I went to take distributor cap off and noticed two plugs hanging there - could I have done damage by continually trying to get her to start with plugs off?
No.

"Check timing by pulling the #1 (front) plug, and rotating the engine by hand with your thumb over the hole until it blows. Then shine a light in and bring the piston up to its highest point. Now pull the distributor cap and see where the tab on the rotor is pointing. If it's not directly under the post leading to the #1 spark plug wire, then your timing is off.
Well not exactly. There is around 15 degrees of crankshaft rotation with the piston at it's highest point. This method does not necessarily set the crankshaft at TDC. The described method should put the rotor under or close to the #1 plug wire location.

If the engine has been running, easier to just rotate the engine by hand until the mark on the pulley lines up with the pointer. Then check the rotor location. If the rotor is not pointed at the #1 plug tower location, rotate the engine another full turn until the pointer lines up with the pulley mark.

how exactly do you rotate the engine by hand??
Pull on a fan blade. Works better if the tractor is out of gear.
I have an excuse. CRS.


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