Points and condencer

My 504 gas likes to eat points and condencers. I'm wondering if I have the right resistor? Anybody know what I should have? 12volts
 
The tractor is 12 volts BUT the coil is 6 soooooooo you need that resistor i have used the same resistor as used on MO Par made before 72-73 now as for part # don't ask me as i gave up remembering part # in 1974 , but sometimes they leak out of the old corroded memory banks from the days as a parts manager .
 
Good brand point and condenser or TSC brand parts makes a big difference.
#1 I use the O'Reilly's part number VR-1 or VR-2 ballast resister and never had any problems with the point or condenser. Or maybe your just gettign bad condensers which will also cause that and again goes back to cheap parts or good brand parts
 
1) One, among many, causes of premature points failure is a weak or undersized or even a total OPEN condenser.

2) Another cause of premature points failure is excess points current which can be caused by

a) The total LV primary resistance (coil + any ballast) is too low. On a 12 volt system in order to limit points current to not much over 4 amps, you need at least 3 ohms (coil + any ballast) as 12/3 = 4 amps.

b) There may be like an unballasted (or under ballasted) 6 volt coil on a 12 volt system THAT WILL BURN POINTS QUICK

On a 12 volt tractor you can use EITHER a full true 12 volt coil alone orrrrrrrrrrrrrr a 6 volt coil PLUS an external
ballast resistor. A coil labeled "12 Volts" or "12 volts not for use with ballast" or "12 volts no ballast required" is a full true 12 volt coil and no ballast is required HOWEVER a coil labeled "12 volts requires external ballast" etc is indeed more like a 6 volt coil and needs ballast like it says or the points will burn up soon and coil run hot.

Many (not all) 12 volt coils have a LV primary resistance of 2.5 to 3.5 or so ohms. Many 6 volt coils have a LV primary resistance of around 1.25 to 2 or so ohms. Many (not all) ignition ballast resistors have around 1.2 to 2 ohms depending on the coils resistance.

Other causes of premature points failure could be a loose or resistive poor mounted condenser.

Of course, a faulty new out of the box condenser (happens often) or inferior quality points (common) can be the problem

Improper gapped points can be another cause

CHECK COIL AND BALLAST RESISTANCE if the total is under 3 ohms the points will burn prematurely.......Insure its NOT a 6 volt coil on a 12 volt system and insure the ballast resistance is adequate........Insure its a good quality condenser............Insure the points when closed are flat and even............check the points gap

Hope this helps

John T
 
It gets to where it will only run at half throttle. Anything higher it just breaks up. I cleaned the whole fuel system twice. Gas cap thru carb. New coil. New wires. Nothing worked. New condencer and points and it ran like new. Now about 200 hrs. and it goes bad again. This is the third time.
 
I am not saying you are doing this, but leaving the key on and the motor off will eat points too.
 
A NAPA should be able to cross the VR-1 part number over. Only things i get at TSC is knifes and mower parts like sections and guards. I NEVER buy any tractor parts form there because they are bad from the get go
 
504, yes I know about that. I really like my little tractor but I need to fix this problem or I'm going to convert it to EI.
 

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