Trouble starting

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Don B.
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Trouble starting

Postby Don B. » Wed Jul 22, 2015 9:49 pm

I just got a 1951 cub and it is hard to start. When it does it runs great. When I hit the starter it turns very weakly. If it doesn't start then, it will turn weaker until it just clicks. I took the starter off held it against the block and it seemed to spin strong. Something to do with ground I suppose? What should I try next. Thanks!
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Re: Trouble starting

Postby Barnyard » Wed Jul 22, 2015 9:58 pm

Start cleaning all your connections. You are not getting all your power to the starter.
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Postby Charles (49) Mo » Wed Jul 22, 2015 10:07 pm

Nice to see your first post. Ditto on your first reply. Rust and corrosion or just plain loose connections are usually the cause of starting problem. Post any other things that we may help you with...

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Re: Trouble starting

Postby Eugene » Wed Jul 22, 2015 11:32 pm

Battery terminal and cable connections as previously mentioned.

Battery condition - possible weak battery.
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Re: Trouble starting

Postby Roostercub » Wed Jul 22, 2015 11:40 pm

Hi, i ve got exactly the same issue, i ve changed the earth lead and cleaned it up its a 6v battery, brand new, i ve charged that up again help??

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Re: Trouble starting

Postby randallc » Thu Jul 23, 2015 3:57 am

Welcome to the forum from Arkansas. Right sized battery cables are important. If someone had added a small ground cable for example it will not carry the load good.
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Re: Trouble starting

Postby Rudi » Thu Jul 23, 2015 4:58 am

Roostercub:

Welcome to the Forum ! Lots of resources for you to access - Cub Book of Knowledge

Your French built Super Cub is essentially no different except for maybe a few extra connections. Make sure all connections are clean, bright and bare metal. Make sure no breaks in the cabling at all. Put the battery on charge. If still no joy .. do a load test on the battery. If that all proves ok - then check the starter ...

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Re: Trouble starting

Postby Rudi » Thu Jul 23, 2015 5:00 am

DonB:

Also, welcome to the forum. Hope you get your starting issue solved
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Don B.
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Re: Trouble starting

Postby Don B. » Thu Jul 23, 2015 7:29 am

Thanks for the replies! Here is some more information.
The battery is nearly new and has good charge. The ground is a new braided type that connects to a bolt (which I cleaned) under the battery box. The other battery clamp is new. It had a starter solenoid on the starter wired to a push button. I replaced that with a new original type button on the starter with the pull rod because I blamed the solenoid. There was no improvement. Can it be difficult to get a good connection between the starter and the frame? Seems unlikely to me.
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Re: Trouble starting

Postby Eugene » Thu Jul 23, 2015 7:40 am

Move the ground cable from the battery box to the top of the transmission.

Question. Corrosion in the older battery cable?

Have the battery tested or conduct a voltage drop test.
I have an excuse. CRS.

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Re: Trouble starting

Postby Dale Finch » Thu Jul 23, 2015 8:02 am

Don B. wrote:...... Can it be difficult to get a good connection between the starter and the frame? Seems unlikely to me.

You MUST have a good "flow path" for the 6v from battery terminal through EVERY connection to, and including, the starter, itself. Then from the ground terminal through EVERY connection, including the "connection" between the tractor chassis (ground) and the face of the starter Where it bolts on. IF you checked ALL the other connections, and definitely have the correct size cables, and have a good battery, you can remove the starter and clean the two mating surfaces.

Double check that your new starter switch is making good contact, too.

Good luck!

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Re: Trouble starting

Postby Matt Kirsch » Thu Jul 23, 2015 12:40 pm

If someone put a solenoid on the starter, the main connection to the starter is broken.

The copper contact on the saddle type starters is SOLDERED to the main winding of the motor. If there was a battery cable bolted directly to that contact on the starter, they had to break that soldered connection to turn it out. At this point you're left with a poor connection from battery power to the starter windings, which can account for the poor starting performance.

I had the same issue with a 240. Someone had replaced the starter with one off a Super C, and had turned the copper contact out of the starter to connect the cable from the solenoid. It would start, poorly. I ended up pulling the starter apart and soldering the connection back together inside the starter, which was a little scary.

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Re: Trouble starting

Postby Roostercub » Thu Jul 23, 2015 10:11 pm

Thank you for all the help, we tried it again last night, and found there was one bad connection but main problem was return spring on accelerator / engine speed control, which was not returning once we did get it firing, will go round it and grease everething up,
Could someone tell me plug sizes and best make plugs to fit bearing in mind the cub is in France?

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Re: Trouble starting

Postby bythepond88 » Fri Jul 24, 2015 12:14 pm

The manual calls for a Champion D-15, but a lot of us prefer to run a hotter plug, which, if you are going to stay with Champion, would be a D-21. Some here don't like Champion, and run an equivalent.
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Re: Trouble starting

Postby Rudi » Sun Jul 26, 2015 3:02 pm

I think the French built Cubs used Bosch M12A plugs but not certain. Any equivalent to the Champion D-21's you can get in France should suffice nicely.

Here is a link to the equivalencies available for D-21 http://www.sparkplug-crossreference.com ... AMP_PN/D21
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