ignition switch again

Frank DiPino

New User
In the spring you correctly dianosed my weak ignition switch. Now near end of summer tractor started running rough a couple backfire, rough when higher throttle and won"t restart for an hour once I shut it off. It does not quit but once I shut it off does not restart. So since you said you had to replace three one summer I guess I am goung back to tractor supply today. I would rather do what you did with the marine toggle switch. Is there anything in particular I need to konw to put one in? Can you tell me how you put your in?
Thanks Frank
 
You can trouble shoot your switch by putting a jumper across the switch, therefore bypassing it.

Easy to do to test it make sure it is the switch before you spend money....

Just my 2 cents....
 
Frank.......listen to me, there are 4-common "runtime issues" with the 4-nipple frontmount ignition.

1) runs fer about 1-min and quits; restarts innna bout 5-mins; BAD condenser, NOT yer problems
2) runs fer about 5-mins and quits; restarts innna bout 10-mins; CLOGGED intank fuel filter; NOT yer problem
3) runs fer about 15-mins and quits; restarts innna bout 30-mins; does that sound like yer weaksister ignition switch problem??? NO!!! You can replace it with a 25A toggle switch iff'n you wanna, but that aint'chur problem
4) runs fer about 1-hrs and quits; restarts innna bout 4-hrs or overnite cooldown; does that sound like yer problem??? Do I haffta tell ya to replace yer squarecan ignition coil???

.......respectfully, Dell, yer self-appointed sparkie-meister
 
" I am goung back to tractor supply today"

That could easily be part of the problem.

I never by anything for my N's from TSC except the sediment bowl gasket & screen.

It is important for you to tell us if your tractor has a 6 volt or 12 volt electrical system & if the distributor is on the front of the engine or on the side. The troubleshooting is different based upon the configuration of your engine.



It takes three things for an engine to run: spark at the right time, compression, & fuel in the right mixture. For the moment, forget about compression & concentrate on narrowing the problem down to spark or fuel.



There are three very important tools you always need to have in your N tool box: a 3 inch piece of wire w/ alligator clips on each end, an old spark plug w/ the gap opened to at least 3/16” ( ¼” is better) and a 7/16 box end wrench. (see tip # 50 at the link below) And, you really do need a working ammeter on the tractor; it is a very important diagnostic tool. With these tools, you can quickly narrow down most N problems to spark or fuel.



Next time it stops, check quickly for fuel then spark. When I say quickly, I mean get off the seat, grab the tools & do it right then. Do not wait a minute or two. First, check for fuel. Get a can & put it under the carb. Remove the bolt in the bottom of the carb; as long as the fuel is turned on, you should see gas flowing out of the carb. Let it run for at least 30 seconds. If it’s a dribble, or runs for 5 seconds & stops, or none at all, you have solved half the problem: it’s fuel related. If gas flows well out of the carb & only stops when you turn it off at the sediment bowl, chances are very good it’s not a fuel problem. So, next, turn the key on, crank the engine & look at the ammeter. What is the needle doing? Does it show a constant discharge, no movement at all, or does it move back & forth slightly? Next, get the old plug, ground it to a rust & paint free spot on the engine, turn the key on & crank the engine. If the spark jumps the 3/16” gap, you probably don’t have a spark problem. If it won’t jump the 3/16” gap, you have a spark problem. If the ammeter needle shows a constant discharge, or doesn’t move at all, that also tells you that you have a spark problem. Jump the ignition switch w/ your jumper wire & see what happens. If it runs, you found the problem. If it doesn’t have spark after you jump the ignition switch, then the chances are about 9 out of ten that Dell is correct: it's the coil. ( do not forget to turn the ignition switch off; see tip # 38)

If it does not have gas coming out of the carb at a steady stream w/ the bolt out for at least 30 seconds, you have a fuel problem. First, remove the gas cap. Your vent could be clogged & it vacuum locked. If that doesn’t work, tap the carb bowl w/ a hammer handle in case the float is sticking closed. (don’t whack it w/ the head of the hammer; you can crack the bowl). If you still don’t see gas flowing, the N has three fuel screens; one in the brass elbow, one in the top of the sediment bowl & one on the stem of the sediment bowl in the gas tank. Check the screen in the elbow & the screen in the top of the sediment bowl. (don’t worry about the one in the tank) Both probably need to be cleaned. If you have the fuel knob turned on all the way, & 1 gallon or less in the tank, it may be trying to feed off of the reserve inlet which is probably clogged. Only open it 2 full turns. Put at least 2 gallons in the tank. (and do not forget to turn the gas off; see tip # 9)



There are ways to check for spark & fuel that work & ways that don't. For example, having gas to the carb is nice, but having it past the float is what counts! That’s why removing the bolt in the bottom of the carb is the way to do it. And, same thing w/ spark at the plugs. Some folks think that checking for spark means pulling a plug wire off & looking for one. Well, it's the distance the spark jumps at the plug that gives you the info you want. It takes about 17kv to jump a 3/16" gap & 22kv to jump ¼” in the open air, so that's why you need to use a spark plug. Or, a store bought plug checker. Remember, it’s 14psi outside of the engine & about 90psi at a 6:1 compression ratio in the cylinders & compressed air creates electrical resistance, so you really need the 17-22kv to fire the plugs when the engine is running.
50 Tips
 
Thanks I have a frony mount 6v system. I do have fuel, I checked as you described. One added note: the engine does not quit it runs rough, loses power on incline more so when higher throttle. Maybe saying rough explains it but the best way I can explain it is the nice even put put is interupted by extra puts and it almost sounds as though it firing too fast. Sort of like what a motor does when you down shift to a lower gear or when you are going down a hill? Well that is what I mean by rough. I have tried a store bought plug light. It lights up but I do not know if that means it as strong as it need to be as you said. So I will try the 3/16 gapped plug and the ignition jumper. I noticed that the ignition wires were a little lose at the plate terminal where that resistor is. Last time I out the ignition wire on I snapped off the post so I had to make another. Maybe it is not the ignition switch already (that did the trick last time) but weak connections. Maybe it would be wise to get another terminal and resistor eh? Sorry for running on.
 
if you think it is a connection at the switch.. just jumper it as a test.

everything you have said so far leads me to believe fuel issue.

soundguy
 
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