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8N 12 volt conversion

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Bob Bechtel

05-10-2001 10:43:18




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I completed the conversion and the tractor ran great.After several hours of mowing with a Brush Hog the engine would shut down and restart after a few minutes wait.Thinking the 6 volt coil must be breaking down I replaced it with a 12 volt coil leaving the resistor installed. This was on the advise of a NewHolland tractor dealer.Now trying to mow I get a popping sound (backfire)from the carburetor intake and loss of power.Adjusting the high speed jet in will reduce the backfiring to intermittent but lowers RPM. Checked timing OK, checked point gap .025. also replaced coil wire to distributer.Any other ideas on what I may have missed.I Was thinking possable intake valve problem but engine runs good under no load condition

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Dell (WA)

05-10-2001 12:37:11




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 Re: 8N 12 volt conversion in reply to Bob Bechtel, 05-10-2001 10:43:18  
Bob..... ..ya gotts bad sparkies BECAUSE the dealer in all his kindness, don't know stuff from shineolla.

The resistor for a 6 volt conversion cuts the 12 volts battery down so the 6 volt coil works properly. If'n you used the same 12 to 6 volt resistor on a 12 volt coil, its the same as trying to run the 12 volt coil offen a 6 volt battery and yer onlys gonna getts 1/2 the sparkies and a lot of poppin'.

So whats an electrically challenged 12 volt converter guy suppost to do? Well, he might want to consider checking the "archives" at the top of this great N-Board and read about the trials and tribulations of fellow electrically challenged N-Owners.

Or he could pay attention to the following:

The dealer was only semi-wrong. If'n you use a 12 volt frontmount coil you must have a current limiting resistor or the 14.7 volts of the alternator will burn out your 12 volt coil. Some of the original 12 volt coils had a WARNING TAG stating 13 VOLTS MAX, believe them!!!

Best Option, go to radio shack (yer not gonna get the correct resistor at the tractor dealer or the corner autoparts store) and get a 0.4 to 0.5 ohm 20 to 25 watt power resistor (values are not too critical, get a clerk to help you) And no, I don't have a part number, that is what store clerks are there for. Hook it up between the ignition switch and the 12 volt frontmount coil terminal. Nothing else in the circuit. Use good electrical practice, you know terminals and insulatiative wires and WARNING that power resistor gets HOT, burnie-burnie. So don't mount the power resistor where it could melt some other wires, got it? ..... ...Dell

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