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Missing 70 gas

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10-22-2000 08:14:15

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my JD 70 runs fine until it gets warm then it starts to miss and backfire.Carb was just rebuilt plugs not to old but seem to be pretty dark for there age.also pistons and rings are less than two years old did the head and valves at that time. Whats the deal with this.Any sugestions please.

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10-22-2000 09:05:51

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 Re: missing 70 gas in reply to Mike, 10-22-2000 08:14:15  
Hi Mike, that sounds like your condenser is going bad. I used to have a 630LP that would do that. I used it a lot, and started keeping a spare on hand for it. Coils are known to act up after warming up, but usally the tractor will just stop with them. If its been a while since you tuned it up, it might be a good idea to change the points when you change the condenser. Good luck, I hope this is all youe problem is. Don

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Thanks Don

10-22-2000 11:28:38

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 Re: Re: missing 70 gas in reply to DP , 10-22-2000 09:05:51  
The condensor is only a couple years old but i'll try it. since you mentioned the coil this one seems hot to the touch after it has been acting up i don't remember this being that way before.Could this be a sighn? Thank you Mike

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10-22-2000 11:50:34

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 Re: Re: Re: missing 70 gas in reply to Thanks Don, 10-22-2000 11:28:38  
Its possible Mike, but I would try the condenser first. The back firing is a classical sign of the condenser. Also check that the resistor is good so the coil has only 6 volts to it. If its a 6 volt coil, 12 volts to it will cause it to overheat.

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