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Tractor Pulling Discussion Forum

CHAD S I NEED HELP

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noidea

08-13-2007 19:18:53




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I took my carb apart and found out that the top half is from a 715. The bottom is from an M. I drilled the main jet out to 7/64ths=.109 I also took the metering stem out and made the bottom set of holes the same size as the top holes. It has a #35 venturi. I used the M load screw and packing. This went well. I could flood it out now by backing out the screw. Well I decided to hook up my multispark box from Summit racing. When I hooked it up and when I crank the engine over it only fires some and it won't hardly start. When it starts it sounds like it is running on 1 or 2 cylinders and it only goes for about 10 seconds. I checked the box and it is sending spark just fine. It is set to six cylinder mode. All of the wires are hooked up per the instructions and I took out the condensor. What is the problem? Could it be my plugs or plug wires?

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ChadS

08-14-2007 08:53:14




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 Re: CHAD S I NEED HELP in reply to noidea, 08-13-2007 19:18:53  
The M bowl will have the brass plug in the bottom of the bowl, that holds the stem in. The 6 cyl bowl will have the stem that screws in the bowl. The M stem is smaller than the 6 cyl, and might mess with fuel delivery. The 6 cyl bowl is a must for the design of that particular carburator. On the IGN, what brand of ign box? Points as a trigger or electronic pickup?

MSD boxes, if thats what it is, you have to have key switched power to the wire that goes to the coil, the large red wire goes to the positve post, the small red wire goes to key switch power, like a remote on a car stereo amp. The black wire goes to ground. Now there is a white wire, and a pigtail plug with 2 wires, the pigtail wires are for electronic pickups,, (petronix) etc etc,, should have supplied plug adapters in the kit to hook up the pickup. Now if you have points, you hook the white wire to the distributor. This should leave one last wire unhooked, and that will go to the negative side of the coil. Make sure the box is grounded to the frame. If its not a MSD, the wiring will be simular, but not the same color codes, but basicly wired the same. Check all your wiring, make sure its wired up right. Next you need to test it out, not starting the engine, but test the ign. If you have points, all you have to do is pull the coil wire out of the cap, put it next to a ground, or bare metal. Your looking for spark, and should be a fast pulse when its triggered. If you got points, remove the cap and use a screwdriver and open and close the point contacts. If its working, it will fire the coil and you should see a spark from the coil wire, should be like a miniature lightning bolt, should zap more than once (multisparks) Electronic IGN, to test, you can loosen the distributor, and turn it back n forth (with the engine off) and make the magnets pass by the pick up and trigger the module to fire the coil. You can put a spark plug on the end of the coil wire and ground out the sparkplug to the frame,, whatever you see for spark from that, will be what you get inside the cyl, so, look at some different gaps on the plugs to see which gets a nice hot spark and a good jump across. Maybe, unhook everything off the IGN, go back to the regular IGN,, get it running and get the right carb bowl for that throttle body. Get it running, that way you know when it dont fire up, its not the carb, and you focus on the IGN wiring. Digital multimeter to check for voltage to know exactly whats going into the box. Hope this helps,,, if its not a MSD, will need to know a few things on the wiring diagram but aint too hard. ChadS www.thetractorshop.com

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noidea

08-14-2007 18:23:11




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 Re: CHAD S I NEED HELP in reply to ChadS, 08-14-2007 08:53:14  
The status has changed. What is wrong with my Summit Racing multispark ignition box. All of the wires are hooked up correct according to instructions. It would run on what seemed like two cylinders for about ten seconds. Now it won't start period. The light flashes when you turn the key to indicate that the unit is functioning properly. When I crank the engine the light doesn't flash as it should. This according to the instructions means that my pickup method isn't working. The white wire is connected directly to the post coming out of the distributor. What is wrong with it?

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noidea

08-14-2007 15:41:00




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 Re: CHAD S I NEED HELP in reply to ChadS, 08-14-2007 08:53:14  
It was running fine with those carb adjustments with the original ignition. This system is the Summit Racing brand multispark box. All of the wires are the same as you mentioned. Except the wire to the positive side of the coil is orange. It will start but it only runs on what sounds like two cylinders for about ten seconds. I performed the spark test and it looks like lightening. Maybe I don't have the box grounded well. The instructions say nothing about grounding the box against the frame. It only has a big black and red wire that goes to the battery.

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ChadS

08-15-2007 06:47:38




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 Re: CHAD S I NEED HELP in reply to noidea, 08-14-2007 15:41:00  
The only thing I can think of at this time would be in the run/start. See, like ford starter swtiches, have a IGN and a Start post on the soliniod. If the light goes dead while in start, and the light is on when its in run,,, best try to wire the IGN switch lead to the battery and by pass the IGN switch, it should have power no matter what. To me, it sounds as if your switch is dead in the start postion, but, the 460-560 had push button starter switches, along with the key for the IGN and accesories. Might be a conflict in how its wired, but should be idnetical as if you were to be wiring up for the ford. I think the 460/560 starter has a ford like soliniod,, but only has one post for the IGN,,, I know on my 69 ford, it has two poles on the solinoid, one for start, and one for run,, if the run is unhooked, it will run only when the starters enguaged, if the start is unhooked, it wont start at all. Might be worth looking into,,, but Id hook the + straight up to the battery, see if it makes the light stay on while its cranking,,, if it does and it fires up, add another switch that gives power while cranking,,, Ive found its bes to use a separate switch for IGN boxes,,, takes the stress away from the IGN switch and the accesories. Dont know if this helps, hope so,, but if not, you better call Summit back and tell em to send you another IGN box. Chad

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