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ibelee

B-112 wont start

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ibelee
Was fine when I stopped it the other day. Put charge on battery, still nothing. Turned the generator pully 1/4 turn and she started. Turned her off. Tried to star again and she wouldn't start. turned the pully 1/4 turn and she started. Anybody know whats going on? Generator was supposed to have just been re-done.

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PatRarick
You didn't say if you tried to start it immediately after shutting down, or if you waited for a time. Three possibilities come to mind. First is a weak battery that doesn't have the cranking amps necessary to turn the engine against the pressure of an opening valve or slight compression. Second is that the engine stopped on the compression stroke and the S/G doesn't have the power to start turning the engine directly against the compression. Turning it may turn just enough to release the compression enough for the S/G to start turning. This would not apply if the engine sat for a few minutes before you tried to restart, as the compression would slowly leak past the rings while sitting. The third possibility is a bad spot on the armature. Doesn't really matter that the S/G was supposedly just redone. Could have been a bad rebuild or a faulty new part.

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ibelee
The battery is definately weak. I tried to start it right after I shut it down and it wouldn't start until I turned the pully. The I came inside and posted this. When I went back out 20 minutes still no start. Battery is way low. It was fine until I plowed the other day. What would cause it to go bad all of a sudden?

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PatRarick
A battery can go all of a sudden. Sulfation builds up on the plates inside until it grows large enough to start shorting out. Or a piece of that sulfation can come off due to the vibration and fall between two plated to short them out.

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HubbardRA
I use a 51R battery in my RBT tractors. I think that will fit a B112. I know it will not fit a Simp 700. It it will fit, then you can get them at WalMart for about $42. I have these in two of my tractors. They are supposed to use a 22NF, but those are hard to find, and the last one I priced ran around $80. One of my tractors had one of the smaller riding lawn mower batteries in it. I thought my SG was bad till I replaced the battery with the larger one. After that it started fine every time. When you rotate the flywheel 1/4 turn thru the compression stroke, you are giving the engine another two revolutions to pick up speed before it hits the compression again. This allows the momentum of the turning engine to kick it past the compression, even though the starter will not pull it past compression by itself. I used this technique for quite a while on a tractor pulling engine that did not have a compression release on it.

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ibelee
Well, a trip to see Wally and $50 later...still no go. I guess Roy was right. Will have to contact Johnmonkey and find out where to take the S/G around here. Why would the S/G fail all of a sudden? Didn't have any problem with it for 3 days. Is their anything else I should be checking first?

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ambler
These guys know what they are doing: K & K Automotive 301 663-5258 Address: 5850 Urbana Pike, Frederick, MD 21704 price used to be $35 + parts. Try blowing out the brushes

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johnmonkey
Could be your contacts in the push button, or contacts in the voltage regulator, or a loose wire. Check all connections and tighten. Just a few thoughts. Jh

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ibelee
Just an update. B-112 is now running again. After putting a new battery, new V/R, new heat shrink terminals, and new wire loom in it, it did turn out to be the S/G. After replacing the other parts, I put the new S/G in it and it started right up. Thanks to all who helped me out. Especially Johnmonkey for the V/R and S/G. Now if I can just figure out how to hook up my new tiller...;)

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