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Tractor Pulling Discussion Forum

Re: John deere G compression/ignition help

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jd b puller

03-08-2013 08:05:06

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- I"d start with a compression check. - I"d also ditch that POS Wico C mag and replace with a Distributor with Pertronix (Some hate them, I"ve had good luck with them), make sure you get the right resistor. Or a Wico X.
- Make sure the cap and rotor are in good shape and not sloppy or cracked.
- Check the timing (use a gun, "retarded" is pretty vaugue). If the compression is as high as it might be, you may need to move the governor a tooth. If you do that, make sure you pull the mag off before putting the side cover on the governor housing or you"ll break the bushing inside the mag
- RPM"s ???
- Cam timing?
- Fuel - you said you found somehting better, what are you actually using?

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4010 puller

03-08-2013 14:14:12

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 Re: John deere G compression/ignition help in reply to jd b puller, 03-08-2013 08:05:06  
whats the best way to time these tractors and what is the right degree for timing. Every book you look in seems to have different specs. I read a post before of setting engine on TDC, then turning distributor till spark occured;that it was timed. Is this accurate?

Which way is advanced, rolling distribotor or mag towards front of tractor?

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jd b puller

03-08-2013 18:50:26

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 Re: John deere G compression/ignition help in reply to 4010 puller, 03-08-2013 14:14:12  

No set RIGHT way to know where to set it without a dyno.

As you roll it forward, it RETARDS it.

Depending on compression and fuel, somewhere between 18-28 degrees works good. if he"s high compression, you will have to move the governor gear a tooth to get the mag to work.

Nice thing about a mag is you can set cranking and runnng sparks independantly. You"d have to get someone to change the guts in the distributor to do that.

Never had to have stiffer springs due to compression, just RPM"s.

My mag worked fine at 11+ compression.

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4010 puller

03-09-2013 04:15:07

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 Re: John deere G compression/ignition help in reply to jd b puller, 03-08-2013 18:50:26  
Is this a good general rule for stock or just for higher compression engines? 18-28* advance is good? That is with engine at TDC and distributor rolled counter clockwise?

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jd g help

03-08-2013 08:32:24

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 Re: John deere G compression/ignition help in reply to jd b puller, 03-08-2013 08:05:06  
Mag has been retarded turned toward front of tractor as much as possible
Factory Rpms
190 lbs at cranking speed
Factory F900 cam timed factory
Seems to run the best on 100 LL aviation

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north puller

03-08-2013 08:40:52

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 Re: John deere G compression/ignition help in reply to jd g help, 03-08-2013 08:32:24  
Get a timing light. Be careful and pay attention to your base timing. I broke the nose off the starter on my 70 with too much base timing (advance seized up at full timing. Next time I tried to start it it kicked back).

Not saying ignition is why its stalling, but you may have another problem with your timing now not helping things.

With 190 psi and a stock cam, you may want to try better fuel than 100LL as you start addind timing.

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