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John Deere Tractors Discussion Forum
Show Parts for Model:

M-420 series question

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JohnDeereJimOhio

04-07-2014 09:05:08
204.9.147.18



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I have been working on my 420c and still don't have it dialed in. I'm thinking this is electrical issues. Here is my question, I went back to my book to check about timing it again and in my book it says the flywheel is marked d/c-Spark and that is TDC on Comp stroke #1 cylinder...

On my 420 it does not have this mark on flywheel. I have a mark that Says RK and a straight line. Which should be used for timing mark?

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Dave H

04-07-2014 18:00:17
208.124.88.35



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 Re: M-420 series question in reply to JohnDeereJimOhio, 04-07-2014 09:05:08  
As i foggily recall, I brought those marks up to the little window and stuck something in there and cleaned then up a bit.



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JohnDeereJimOhio

04-07-2014 12:25:41
204.9.147.18



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 Re: M-420 series question in reply to JohnDeereJimOhio, 04-07-2014 09:05:08  
Thank you for the info, Im going to put a light on it this weekend...



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Mike M

04-07-2014 12:55:39
24.140.0.120



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 Re: M-420 series question in reply to JohnDeereJimOhio, 04-07-2014 12:25:41  
Put some chalk ( your a teacher right you should have some laying around )on the mark to help it show up when running.



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Mike M

04-07-2014 10:10:55
24.140.0.120



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 Re: M-420 series question in reply to JohnDeereJimOhio, 04-07-2014 09:05:08  
You likely have just the RK of the SPARK and the line under the words is your mark. IIRC that mark is for the spark at wide open throttle. Should be around DC when turning by hand or a really slow idle.



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Hotflashjr

04-07-2014 10:27:01
199.145.239.156



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 Re: M-420 series question in reply to Mike M, 04-07-2014 10:10:55  
I agree. I used a timing light on my MT and was able to get spark and the corresponding line in the window at full throttle and DC at low idle. It starts and runs great now!



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