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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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770 plugs?

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Codie

04-12-2008 08:32:49




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Both of my 770's had D-21 champion plugs in them and they ran good. Today I decided to put different plugs in them. I put C-87 delco plugs in one and 386 Autolite plugs in the other. Both tractors ran good before now both tractors run like crap. Any ideas? I always thought that delco and autolite plugs were better plugs.




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MCL

04-12-2008 10:40:19




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 Re: 770 plugs? in reply to Codie, 04-12-2008 08:32:49  
I use the D21's. They are hotter and less likely to foul just putting around.



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770

04-12-2008 09:24:26




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 Re: 770 plugs? in reply to Codie, 04-12-2008 08:32:49  
I've been running Autolite 386's in my 77 and 770 for years. Do what old says and re-check the gap. How are the wires? Could you by chance maybe damaged a wire or mixed up the firing order? just ideas.



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Larry NE IL

04-12-2008 15:42:02




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 Re: 770 plugs? in reply to 770, 04-12-2008 09:24:26  
That's something to check for sure. Last year my son went out to bale hay with our '67 770. Came back in and said it didn't have any power. I could see the black stripes on the oil filter form the plug wites arcing.



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old

04-12-2008 09:04:42




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 Re: 770 plugs? in reply to Codie, 04-12-2008 08:32:49  
Did you set the plug gap correctly?? Also a D-21 is a hot plug and if the ones you installed where cooler plugs that could be your problem. Also the D-21 is a non resister plug and the ones you got could be resister type which would also cause you problems



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Codie

04-12-2008 11:21:57




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 Re: 770 plugs? in reply to old, 04-12-2008 09:04:42  
I opened the gap up a little more and that seems to have made all of the difference. Both tractors are running like new now.



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old

04-12-2008 11:27:44




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 Re: 770 plugs? in reply to Codie, 04-12-2008 11:21:57  
Plug do not come pre-gapped so you have to do that before you install them. Gap should be 0.025



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Jeff Weisensel

04-12-2008 11:05:51




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 Re: 770 plugs? in reply to old, 04-12-2008 09:04:42  
Hi Also I question the quality of spark plugs these days. I have put a higher grade of spark plugs in anything from lawn mowers to motorcycles to cars to farm tractors and I have found sticking with the cheaper plugs works the best for me. I think the spark plug makers need to evaluate there products. Thanks Jeff



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